Greven, Predator Captain (Commander)

Background image for Back to Basics - The Top 10 Most Played Rakdos Cards in Commander
Nick Price
Jun 20, 2024
Back to Basics - The Top 10 Most Played Rakdos Cards in Commander
And now for the most entertaining Top 10 list of them all! It's our Top 10 Most Played Rakdos Cards in Commander.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Hexing Squelcher
2.2%inclusion2 decks92 decks
-11%synergy
Madame Null, Power Broker
1.9%inclusion1 decks54 decks
2%synergy
Soul Immolation
1.2%inclusion1 decks83 decks
0%synergy
End-Blaze Epiphany
1.2%inclusion1 decks83 decks
1%synergy
Barbed Bloodletter
1.2%inclusion1 decks83 decks
1%synergy
High Synergy Cards
Wall of Blood
67%inclusion818 decks1.22K decks
65%synergy
Rush of Vitality
62%inclusion751 decks1.22K decks
61%synergy
Immolating Souleater
61%inclusion750 decks1.22K decks
60%synergy
Basilisk Collar
66%inclusion803 decks1.22K decks
55%synergy
Chandra's Ignition
61%inclusion748 decks1.22K decks
55%synergy
Temur Battle Rage
56%inclusion680 decks1.22K decks
54%synergy
Kediss, Emberclaw Familiar
56%inclusion681 decks1.22K decks
53%synergy
Vorrac Battlehorns
53%inclusion649 decks1.22K decks
52%synergy
Essence Harvest
51%inclusion627 decks1.22K decks
51%synergy
Treasonous Ogre
54%inclusion655 decks1.22K decks
51%synergy
Top Cards
Swiftfoot Boots
69%inclusion845 decks1.22K decks
37%synergy
Feed the Swarm
67%inclusion821 decks1.22K decks
25%synergy
Fire Covenant
57%inclusion693 decks1.22K decks
50%synergy
Whip of Erebos
54%inclusion657 decks1.22K decks
47%synergy
Chaos Warp
50%inclusion614 decks1.22K decks
2%synergy
Rowan, Scion of War
50%inclusion613 decks1.22K decks
49%synergy
Rotting Regisaur
49%inclusion597 decks1.22K decks
48%synergy
Loxodon Warhammer
48%inclusion592 decks1.22K decks
47%synergy
Shadowspear
47%inclusion574 decks1.22K decks
43%synergy
Daring Fiendbonder
46%inclusion559 decks1.22K decks
45%synergy
Game Changers
Bolas's Citadel
32%inclusion392 decks1.22K decks
21%synergy
Necropotence
26%inclusion312 decks1.22K decks
20%synergy
Ancient Tomb
23%inclusion277 decks1.22K decks
13%synergy
Jeska's Will
16%inclusion199 decks1.22K decks
-8%synergy
Vampiric Tutor
14%inclusion172 decks1.22K decks
0%synergy
Demonic Tutor
14%inclusion168 decks1.22K decks
-4%synergy
Mana Vault
10%inclusion126 decks1.22K decks
5%synergy
Ad Nauseam
7.0%inclusion85 decks1.22K decks
4%synergy
The One Ring
6.8%inclusion83 decks1.22K decks
-1%synergy
Gamble
5.7%inclusion70 decks1.22K decks
-4%synergy
Creatures
Lupine Prototype
44%inclusion542 decks1.22K decks
44%synergy
Phyrexian Soulgorger
44%inclusion542 decks1.22K decks
44%synergy
Anger
44%inclusion534 decks1.22K decks
31%synergy
K'rrik, Son of Yawgmoth
43%inclusion522 decks1.22K decks
39%synergy
Lightning Skelemental
42%inclusion516 decks1.22K decks
41%synergy
Solemn Simulacrum
39%inclusion476 decks1.22K decks
18%synergy
Silent Arbiter
36%inclusion445 decks1.22K decks
35%synergy
Moltensteel Dragon
36%inclusion434 decks1.22K decks
35%synergy
Combat Celebrant
35%inclusion430 decks1.22K decks
33%synergy
Shakedown Heavy
33%inclusion403 decks1.22K decks
32%synergy
Chainer, Nightmare Adept
32%inclusion388 decks1.22K decks
24%synergy
Kalakscion, Hunger Tyrant
31%inclusion233 decks755 decks
30%synergy
Doom Whisperer
30%inclusion361 decks1.22K decks
27%synergy
Ball Lightning
28%inclusion343 decks1.22K decks
27%synergy
Yargle, Glutton of Urborg
24%inclusion296 decks1.22K decks
24%synergy
Relic Golem
24%inclusion289 decks1.22K decks
24%synergy
Generator Servant
23%inclusion282 decks1.22K decks
23%synergy
Arc Runner
23%inclusion278 decks1.22K decks
23%synergy
Cosmic Larva
22%inclusion271 decks1.22K decks
22%synergy
Vilis, Broker of Blood
22%inclusion268 decks1.22K decks
18%synergy
Blood Celebrant
22%inclusion266 decks1.22K decks
20%synergy
Feldon of the Third Path
20%inclusion242 decks1.22K decks
15%synergy
Dark Confidant
19%inclusion236 decks1.22K decks
15%synergy
Vindictive Lich
18%inclusion223 decks1.22K decks
18%synergy
Monoist Sentry
18%inclusion78 decks433 decks
18%synergy
Gray Merchant of Asphodel
18%inclusion219 decks1.22K decks
7%synergy
Captivating Crew
18%inclusion216 decks1.22K decks
16%synergy
Disciple of Bolas
17%inclusion208 decks1.22K decks
14%synergy
Kardur, Doomscourge
17%inclusion206 decks1.22K decks
0%synergy
Kokusho, the Evening Star
15%inclusion184 decks1.22K decks
14%synergy
Boggart Trawler
14%inclusion153 decks1.07K decks
8%synergy
Bloodsworn Steward
14%inclusion173 decks1.22K decks
13%synergy
Thunderblust
14%inclusion169 decks1.22K decks
13%synergy
Qarsi Revenant
14%inclusion87 decks635 decks
12%synergy
Rot-Curse Rakshasa
13%inclusion81 decks625 decks
12%synergy
Enduring Courage
13%inclusion122 decks943 decks
10%synergy
Xu-Ifit, Osteoharmonist
13%inclusion57 decks441 decks
12%synergy
Sonorous Howlbonder
13%inclusion155 decks1.22K decks
12%synergy
Hunted Bonebrute
12%inclusion150 decks1.22K decks
12%synergy
Darkstar Augur
12%inclusion124 decks1.01K decks
11%synergy
Labyrinth Raptor
12%inclusion147 decks1.22K decks
11%synergy
The Beast, Deathless Prince
12%inclusion141 decks1.22K decks
11%synergy
Sheoldred, the Apocalypse
11%inclusion137 decks1.22K decks
4%synergy
Myr Convert
11%inclusion129 decks1.22K decks
10%synergy
Phyrexian Delver
10%inclusion128 decks1.22K decks
10%synergy
Zealous Conscripts
10%inclusion128 decks1.22K decks
8%synergy
Tyrox, Saurid Tyrant
10%inclusion78 decks755 decks
10%synergy
Ebondeath, Dracolich
10%inclusion119 decks1.22K decks
9%synergy
Hellkite Courser
9.0%inclusion110 decks1.22K decks
9%synergy
Ayara, Widow of the Realm
8.4%inclusion103 decks1.22K decks
6%synergy
Instants
Unexpected Fangs
42%inclusion518 decks1.22K decks
42%synergy
Dark Ritual
42%inclusion514 decks1.22K decks
0%synergy
Tainted Strike
41%inclusion501 decks1.22K decks
39%synergy
Bolt Bend
39%inclusion478 decks1.22K decks
29%synergy
Terminate
37%inclusion451 decks1.22K decks
-3%synergy
Act of Aggression
34%inclusion411 decks1.22K decks
33%synergy
Malakir Rebirth
33%inclusion407 decks1.22K decks
18%synergy
Bedevil
32%inclusion387 decks1.22K decks
-3%synergy
Imp's Mischief
29%inclusion359 decks1.22K decks
20%synergy
Blessing of Belzenlok
29%inclusion348 decks1.22K decks
28%synergy
Fling
28%inclusion345 decks1.22K decks
24%synergy
Soul's Fire
28%inclusion339 decks1.22K decks
27%synergy
Rakdos Charm
27%inclusion331 decks1.22K decks
-16%synergy
Return to Action
25%inclusion310 decks1.22K decks
24%synergy
Kazuul's Fury
25%inclusion308 decks1.22K decks
21%synergy
Hatred
24%inclusion287 decks1.22K decks
23%synergy
Deflecting Swat
20%inclusion246 decks1.22K decks
0%synergy
Withering Torment
19%inclusion182 decks943 decks
-3%synergy
Dismember
19%inclusion229 decks1.22K decks
15%synergy
Infernal Grasp
17%inclusion206 decks1.22K decks
2%synergy
Bitter Triumph
16%inclusion194 decks1.22K decks
11%synergy
Alchemist's Gift
15%inclusion183 decks1.22K decks
15%synergy
Snuff Out
15%inclusion181 decks1.22K decks
11%synergy
Untimely Malfunction
14%inclusion137 decks947 decks
-4%synergy
Fell the Profane
14%inclusion149 decks1.09K decks
1%synergy
Unleash Fury
14%inclusion166 decks1.22K decks
12%synergy
Vendetta
14%inclusion165 decks1.22K decks
13%synergy
Tibalt's Trickery
12%inclusion147 decks1.22K decks
-1%synergy
Redirect Lightning
12%inclusion45 decks381 decks
3%synergy
Supernatural Stamina
11%inclusion140 decks1.22K decks
6%synergy
Devour in Shadow
11%inclusion135 decks1.22K decks
11%synergy
Deadly Rollick
11%inclusion132 decks1.22K decks
-10%synergy
Abrade
10%inclusion122 decks1.22K decks
-12%synergy
Butcher's Glee
10%inclusion121 decks1.22K decks
10%synergy
Toxin Analysis
8.4%inclusion103 decks1.22K decks
8%synergy
Tragic Slip
8.4%inclusion103 decks1.22K decks
4%synergy
Plunge into Darkness
7.7%inclusion94 decks1.22K decks
7%synergy
Grotesque Mutation
7.5%inclusion91 decks1.22K decks
7%synergy
Red Elemental Blast
7.5%inclusion91 decks1.22K decks
-2%synergy
Reckless Spite
7.2%inclusion88 decks1.22K decks
7%synergy
Psychotic Fury
7.0%inclusion85 decks1.22K decks
7%synergy
Undying Malice
6.8%inclusion83 decks1.22K decks
0%synergy
The Last Agni Kai
6.8%inclusion16 decks237 decks
1%synergy
Pyroblast
6.3%inclusion77 decks1.22K decks
-3%synergy
Not Dead After All
6.1%inclusion75 decks1.22K decks
-3%synergy
Stinging Study
5.9%inclusion72 decks1.22K decks
5%synergy
Valakut Awakening
5.6%inclusion68 decks1.22K decks
-2%synergy
Self-Destruct
5.4%inclusion29 decks539 decks
5%synergy
Mages' Contest
5.2%inclusion63 decks1.22K decks
5%synergy
Sorceries
Toxic Deluge
41%inclusion496 decks1.22K decks
23%synergy
Phyrexian Purge
38%inclusion469 decks1.22K decks
38%synergy
Tentative Connection
38%inclusion467 decks1.22K decks
38%synergy
Reanimate
38%inclusion459 decks1.22K decks
15%synergy
Sign in Blood
29%inclusion355 decks1.22K decks
6%synergy
Blasphemous Act
29%inclusion352 decks1.22K decks
-22%synergy
Vandalblast
25%inclusion308 decks1.22K decks
-5%synergy
Night's Whisper
25%inclusion306 decks1.22K decks
6%synergy
Read the Bones
23%inclusion281 decks1.22K decks
10%synergy
Sundering Eruption
13%inclusion144 decks1.09K decks
8%synergy
Exsanguinate
13%inclusion156 decks1.22K decks
3%synergy
Command the Dreadhorde
12%inclusion146 decks1.22K decks
11%synergy
Faithless Looting
12%inclusion144 decks1.22K decks
-16%synergy
Seize the Day
12%inclusion143 decks1.22K decks
10%synergy
Rite of Consumption
10%inclusion119 decks1.22K decks
9%synergy
Song-Mad Treachery
9.0%inclusion110 decks1.22K decks
8%synergy
Act of Treason
8.8%inclusion108 decks1.22K decks
7%synergy
Ashes to Ashes
8.8%inclusion108 decks1.22K decks
9%synergy
Grim Tutor
7.6%inclusion93 decks1.22K decks
3%synergy
Kari Zev's Expertise
7.3%inclusion89 decks1.22K decks
6%synergy
Mark of Mutiny
7.0%inclusion86 decks1.22K decks
6%synergy
Victimize
7.0%inclusion85 decks1.22K decks
-8%synergy
Wheel of Misfortune
6.7%inclusion82 decks1.22K decks
1%synergy
Killing Wave
6.4%inclusion78 decks1.22K decks
6%synergy
Claim the Firstborn
6.1%inclusion75 decks1.22K decks
5%synergy
Damnation
6.0%inclusion73 decks1.22K decks
-1%synergy
Profane Transfusion
5.9%inclusion72 decks1.22K decks
5%synergy
Dreadbore
5.9%inclusion72 decks1.22K decks
1%synergy
Agadeem's Awakening
5.8%inclusion71 decks1.22K decks
2%synergy
Seize the Spotlight
5.2%inclusion64 decks1.22K decks
1%synergy
Shatterskull Smashing
5.2%inclusion63 decks1.22K decks
2%synergy
Utility Artifacts
Lightning Greaves
43%inclusion531 decks1.22K decks
9%synergy
Mask of Griselbrand
40%inclusion486 decks1.22K decks
36%synergy
Pact Weapon
30%inclusion367 decks1.22K decks
29%synergy
Wayfarer's Bauble
28%inclusion344 decks1.22K decks
14%synergy
Obsidian Battle-Axe
19%inclusion235 decks1.22K decks
19%synergy
Whispersilk Cloak
16%inclusion196 decks1.22K decks
11%synergy
Poet's Quill
14%inclusion170 decks1.22K decks
14%synergy
Key to the City
14%inclusion170 decks1.22K decks
11%synergy
Netherborn Altar
12%inclusion146 decks1.22K decks
12%synergy
Resurrection Orb
9.0%inclusion110 decks1.22K decks
8%synergy
The Reaver Cleaver
8.8%inclusion107 decks1.22K decks
4%synergy
Butcher's Cleaver
8.7%inclusion106 decks1.22K decks
9%synergy
Trailblazer's Boots
8.7%inclusion106 decks1.22K decks
7%synergy
Mithril Coat
7.9%inclusion97 decks1.22K decks
3%synergy
Lavaspur Boots
7.9%inclusion91 decks1.16K decks
6%synergy
Urabrask's Forge
7.5%inclusion92 decks1.22K decks
3%synergy
Hand of Vecna
7.0%inclusion85 decks1.22K decks
7%synergy
Venser's Journal
6.2%inclusion76 decks1.22K decks
6%synergy
Brotherhood Regalia
6.0%inclusion63 decks1.04K decks
4%synergy
Mimic Vat
5.7%inclusion70 decks1.22K decks
4%synergy
Two-Handed Axe
5.7%inclusion69 decks1.22K decks
5%synergy
Prowler's Helm
5.6%inclusion68 decks1.22K decks
5%synergy
Enchantments
Vampiric Link
35%inclusion424 decks1.22K decks
34%synergy
Unspeakable Symbol
32%inclusion387 decks1.22K decks
31%synergy
Black Market Connections
30%inclusion369 decks1.22K decks
13%synergy
Phyrexian Arena
24%inclusion292 decks1.22K decks
0%synergy
Font of Agonies
23%inclusion277 decks1.22K decks
22%synergy
Soul Channeling
22%inclusion274 decks1.22K decks
22%synergy
Phyrexian Reclamation
18%inclusion225 decks1.22K decks
15%synergy
Eternal Thirst
16%inclusion198 decks1.22K decks
15%synergy
Kaya's Ghostform
15%inclusion188 decks1.22K decks
10%synergy
Greed
14%inclusion169 decks1.22K decks
12%synergy
Descent into Avernus
11%inclusion132 decks1.22K decks
1%synergy
Exquisite Blood
10%inclusion127 decks1.22K decks
3%synergy
Dark Tutelage
10%inclusion120 decks1.22K decks
8%synergy
Rite of the Raging Storm
8.8%inclusion107 decks1.22K decks
6%synergy
Footfall Crater
8.3%inclusion101 decks1.22K decks
8%synergy
Pain for All
7.6%inclusion34 decks448 decks
6%synergy
Phyresis
7.5%inclusion91 decks1.22K decks
6%synergy
Rising of the Day
6.8%inclusion83 decks1.22K decks
2%synergy
Animate Dead
6.8%inclusion83 decks1.22K decks
-3%synergy
Demonic Embrace
5.6%inclusion68 decks1.22K decks
5%synergy
Planeswalkers
Jeska, Thrice Reborn
5.6%inclusion68 decks1.22K decks
5%synergy
Utility Lands
Rogue's Passage
62%inclusion757 decks1.22K decks
42%synergy
Reliquary Tower
56%inclusion689 decks1.22K decks
38%synergy
Witch's Clinic
48%inclusion584 decks1.22K decks
40%synergy
Bojuka Bog
38%inclusion459 decks1.22K decks
2%synergy
Hall of the Bandit Lord
31%inclusion380 decks1.22K decks
30%synergy
Shizo, Death's Storehouse
30%inclusion367 decks1.22K decks
25%synergy
Arena of Glory
23%inclusion242 decks1.07K decks
14%synergy
Castle Locthwain
21%inclusion255 decks1.22K decks
15%synergy
Urborg, Tomb of Yawgmoth
20%inclusion248 decks1.22K decks
1%synergy
The Black Gate
20%inclusion246 decks1.22K decks
17%synergy
Command Beacon
18%inclusion220 decks1.22K decks
12%synergy
Barbarian Ring
13%inclusion159 decks1.22K decks
11%synergy
War Room
11%inclusion132 decks1.22K decks
7%synergy
Cabal Pit
10%inclusion122 decks1.22K decks
8%synergy
Temple of the False God
10%inclusion117 decks1.22K decks
0%synergy
Cabal Coffers
10%inclusion116 decks1.22K decks
0%synergy
Flamekin Village
9.1%inclusion111 decks1.22K decks
8%synergy
Mortuary Mire
9.0%inclusion110 decks1.22K decks
3%synergy
Susur Secundi, Void Altar
8.6%inclusion39 decks451 decks
6%synergy
Ramunap Ruins
8.6%inclusion105 decks1.22K decks
6%synergy
Hanweir Battlements
7.5%inclusion92 decks1.22K decks
6%synergy
Shinka, the Bloodsoaked Keep
7.2%inclusion88 decks1.22K decks
5%synergy
Ifnir Deadlands
6.5%inclusion79 decks1.22K decks
5%synergy
Ghost Quarter
6.4%inclusion78 decks1.22K decks
5%synergy
Takenuma, Abandoned Mire
6.3%inclusion77 decks1.22K decks
-3%synergy
Barren Moor
5.9%inclusion72 decks1.22K decks
1%synergy
Urza's Saga
5.8%inclusion71 decks1.22K decks
0%synergy
Lavaclaw Reaches
5.5%inclusion67 decks1.22K decks
3%synergy
High Market
5.5%inclusion67 decks1.22K decks
1%synergy
Forgotten Cave
5.4%inclusion66 decks1.22K decks
0%synergy
Mana Artifacts
Sol Ring
89%inclusion1.09K decks1.22K decks
3%synergy
Arcane Signet
81%inclusion995 decks1.22K decks
-1%synergy
Talisman of Indulgence
73%inclusion886 decks1.22K decks
17%synergy
Rakdos Signet
70%inclusion854 decks1.22K decks
10%synergy
Thought Vessel
55%inclusion676 decks1.22K decks
37%synergy
Mind Stone
37%inclusion452 decks1.22K decks
8%synergy
Fellwar Stone
31%inclusion383 decks1.22K decks
-2%synergy
Commander's Sphere
17%inclusion202 decks1.22K decks
-1%synergy
Decanter of Endless Water
13%inclusion162 decks1.22K decks
11%synergy
Charcoal Diamond
13%inclusion159 decks1.22K decks
4%synergy
Fire Diamond
13%inclusion153 decks1.22K decks
4%synergy
Cursed Mirror
12%inclusion143 decks1.22K decks
0%synergy
Worn Powerstone
10%inclusion125 decks1.22K decks
7%synergy
Liquimetal Torque
10%inclusion121 decks1.22K decks
5%synergy
Staff of Compleation
7.0%inclusion85 decks1.22K decks
6%synergy
Lands
Swamp
97%inclusion1.19K decks1.22K decks
0%synergy
Mountain
97%inclusion1.19K decks1.22K decks
0%synergy
Command Tower
86%inclusion1.05K decks1.22K decks
0%synergy
Sulfurous Springs
64%inclusion783 decks1.22K decks
18%synergy
Dragonskull Summit
62%inclusion760 decks1.22K decks
0%synergy
Smoldering Marsh
59%inclusion715 decks1.22K decks
-5%synergy
Blood Crypt
54%inclusion657 decks1.22K decks
9%synergy
Rakdos Carnarium
39%inclusion473 decks1.22K decks
6%synergy
Luxury Suite
39%inclusion471 decks1.22K decks
0%synergy
Foreboding Ruins
38%inclusion469 decks1.22K decks
-7%synergy
Bloodstained Mire
37%inclusion447 decks1.22K decks
4%synergy
Malakir Rebirth
33%inclusion407 decks1.22K decks
18%synergy
Tainted Peak
33%inclusion406 decks1.22K decks
-9%synergy
Graven Cairns
33%inclusion397 decks1.22K decks
2%synergy
Myriad Landscape
31%inclusion379 decks1.22K decks
12%synergy
Haunted Ridge
31%inclusion377 decks1.22K decks
-5%synergy
Shadowblood Ridge
30%inclusion363 decks1.22K decks
-5%synergy
Kazuul's Fury
25%inclusion308 decks1.22K decks
21%synergy
Exotic Orchard
25%inclusion304 decks1.22K decks
-6%synergy
Temple of Malice
25%inclusion302 decks1.22K decks
-9%synergy
Mount Doom
24%inclusion292 decks1.22K decks
7%synergy
Blightstep Pathway
22%inclusion274 decks1.22K decks
0%synergy
City of Brass
22%inclusion263 decks1.22K decks
15%synergy
Bloodfell Caves
17%inclusion206 decks1.22K decks
-2%synergy
Evolving Wilds
16%inclusion199 decks1.22K decks
-5%synergy
Mana Confluence
16%inclusion197 decks1.22K decks
10%synergy
Blazemire Verge
16%inclusion149 decks951 decks
-15%synergy
Canyon Slough
16%inclusion190 decks1.22K decks
-4%synergy
Boggart Trawler
14%inclusion153 decks1.07K decks
8%synergy
Fell the Profane
14%inclusion149 decks1.09K decks
1%synergy
Sundering Eruption
13%inclusion144 decks1.09K decks
8%synergy
Raucous Theater
12%inclusion149 decks1.22K decks
-10%synergy
Terramorphic Expanse
12%inclusion142 decks1.22K decks
-4%synergy
Badlands
11%inclusion140 decks1.22K decks
-2%synergy
Akoum Refuge
11%inclusion130 decks1.22K decks
4%synergy
Tarnished Citadel
10%inclusion123 decks1.22K decks
9%synergy
Blackcleave Cliffs
10%inclusion119 decks1.22K decks
-10%synergy
Song-Mad Treachery
9.0%inclusion110 decks1.22K decks
8%synergy
Pinnacle Monk
8.4%inclusion90 decks1.07K decks
1%synergy
Ash Barrens
6.7%inclusion82 decks1.22K decks
-1%synergy
Prismatic Vista
6.6%inclusion81 decks1.22K decks
1%synergy
Rakdos Guildgate
6.2%inclusion76 decks1.22K decks
-1%synergy
Marsh Flats
6.2%inclusion76 decks1.22K decks
-2%synergy
Polluted Delta
6.0%inclusion73 decks1.22K decks
-2%synergy
Agadeem's Awakening
5.8%inclusion71 decks1.22K decks
2%synergy
Arid Mesa
5.7%inclusion69 decks1.22K decks
-3%synergy
Valakut Awakening
5.6%inclusion68 decks1.22K decks
-2%synergy
Wooded Foothills
5.2%inclusion64 decks1.22K decks
-2%synergy
Fabled Passage
5.2%inclusion64 decks1.22K decks
-3%synergy
Shatterskull Smashing
5.2%inclusion63 decks1.22K decks
2%synergy