Emry, Lurker of the Loch (Commander) - Exhibition

Emry, Lurker of the Loch
Rank #427
15decks
Cooper Gottfried
Mar 23, 2026
The Top 40 Four-Mana Commanders
This list of the top 40 four-mana commanders is full of many of the best commanders out there. How many of these have you played against?
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Seat of the Synod
80%inclusion12 decks15 decks
61%synergy
Codex Shredder
53%inclusion8 decks15 decks
48%synergy
Foundry Inspector
60%inclusion9 decks15 decks
46%synergy
Aether Spellbomb
53%inclusion8 decks15 decks
45%synergy
Mirran Spy
47%inclusion7 decks15 decks
43%synergy
Etherium Sculptor
60%inclusion9 decks15 decks
43%synergy
Darksteel Citadel
53%inclusion8 decks15 decks
42%synergy
Cloud Key
47%inclusion7 decks15 decks
40%synergy
Conjurer's Bauble
40%inclusion6 decks15 decks
38%synergy
Riddlesmith
40%inclusion6 decks15 decks
36%synergy
Top Cards
Counterspell
53%inclusion8 decks15 decks
-13%synergy
Wayfarer's Bauble
47%inclusion7 decks15 decks
29%synergy
Swiftfoot Boots
47%inclusion7 decks15 decks
19%synergy
An Offer You Can't Refuse
40%inclusion6 decks15 decks
2%synergy
Mishra's Bauble
40%inclusion6 decks15 decks
31%synergy
Ornithopter
40%inclusion6 decks15 decks
32%synergy
Thirst for Knowledge
40%inclusion6 decks15 decks
36%synergy
Mystic Forge
40%inclusion6 decks15 decks
30%synergy
Dramatic Reversal
40%inclusion6 decks15 decks
21%synergy
Pongify
33%inclusion5 decks15 decks
-7%synergy
Creatures
Trophy Mage
33%inclusion5 decks15 decks
27%synergy
Sai, Master Thopterist
33%inclusion5 decks15 decks
21%synergy
Forensic Gadgeteer
33%inclusion5 decks15 decks
23%synergy
Shimmer Myr
33%inclusion5 decks15 decks
27%synergy
Solemn Simulacrum
27%inclusion4 decks15 decks
5%synergy
Phyrexian Metamorph
27%inclusion4 decks15 decks
7%synergy
Walking Ballista
27%inclusion4 decks15 decks
21%synergy
Thought Monitor
27%inclusion4 decks15 decks
16%synergy
The Reality Chip
27%inclusion4 decks15 decks
14%synergy
Scrap Trawler
20%inclusion3 decks15 decks
16%synergy
Patrician Geist
20%inclusion3 decks15 decks
19%synergy
Liberator, Urza's Battlethopter
20%inclusion3 decks15 decks
15%synergy
Kappa Cannoneer
20%inclusion3 decks15 decks
12%synergy
Steel Overseer
20%inclusion3 decks15 decks
16%synergy
Diligent Excavator
20%inclusion3 decks15 decks
19%synergy
Neerdiv, Devious Diver
20%inclusion3 decks15 decks
19%synergy
Silver Myr
20%inclusion3 decks15 decks
9%synergy
Myr Retriever
20%inclusion3 decks15 decks
16%synergy
Master Transmuter
20%inclusion3 decks15 decks
15%synergy
Jhoira's Familiar
20%inclusion3 decks15 decks
15%synergy
Spellskite
20%inclusion3 decks15 decks
9%synergy
Trinket Mage
20%inclusion3 decks15 decks
11%synergy
Mm'menon, the Right Hand
17%inclusion2 decks12 decks
13%synergy
Lady Octopus, Inspired Inventor
14%inclusion1 decks7 decks
12%synergy
Cavalier of Gales
13%inclusion2 decks15 decks
12%synergy
Displacer Kitten
13%inclusion2 decks15 decks
4%synergy
Padeem, Consul of Innovation
13%inclusion2 decks15 decks
4%synergy
Marvin, Murderous Mimic
13%inclusion2 decks15 decks
10%synergy
Diamond Knight
13%inclusion2 decks15 decks
13%synergy
Xerex Strobe-Knight
13%inclusion2 decks15 decks
13%synergy
Syr Ginger, the Meal Ender
13%inclusion2 decks15 decks
13%synergy
Vantress Paladin
13%inclusion2 decks15 decks
13%synergy
Ornithopter of Paradise
13%inclusion2 decks15 decks
3%synergy
Knights of Dol Amroth
13%inclusion2 decks15 decks
13%synergy
Transplant Theorist
13%inclusion2 decks15 decks
12%synergy
Isperia's Skywatch
13%inclusion2 decks15 decks
13%synergy
Brass Squire
13%inclusion2 decks15 decks
12%synergy
Metalwork Colossus
13%inclusion2 decks15 decks
11%synergy
Drift of Phantasms
13%inclusion2 decks15 decks
11%synergy
Triton Shorestalker
13%inclusion2 decks15 decks
10%synergy
Memnite
13%inclusion2 decks15 decks
10%synergy
Palladium Myr
13%inclusion2 decks15 decks
9%synergy
Gryff Vanguard
13%inclusion2 decks15 decks
13%synergy
Chakram Retriever
13%inclusion2 decks15 decks
12%synergy
Syr Elenora, the Discerning
13%inclusion2 decks15 decks
13%synergy
Jousting Dummy
13%inclusion2 decks15 decks
13%synergy
Unctus, Grand Metatect
13%inclusion2 decks15 decks
8%synergy
Protocol Knight
13%inclusion2 decks15 decks
13%synergy
Tenacious Tomeseeker
13%inclusion2 decks15 decks
13%synergy
Traxos, Scourge of Kroog
13%inclusion2 decks15 decks
12%synergy
Instants
Frantic Search
33%inclusion5 decks15 decks
2%synergy
Rapid Hybridization
27%inclusion4 decks15 decks
-8%synergy
Whir of Invention
27%inclusion4 decks15 decks
14%synergy
Brainstorm
27%inclusion4 decks15 decks
-14%synergy
Disruption Protocol
27%inclusion4 decks15 decks
25%synergy
Negate
20%inclusion3 decks15 decks
-18%synergy
Fact or Fiction
20%inclusion3 decks15 decks
11%synergy
Flare of Denial
20%inclusion3 decks15 decks
13%synergy
Swan Song
20%inclusion3 decks15 decks
-7%synergy
Arcane Denial
20%inclusion3 decks15 decks
-16%synergy
Dig Through Time
20%inclusion3 decks15 decks
11%synergy
Aetherize
20%inclusion3 decks15 decks
-10%synergy
Cerebral Download
17%inclusion2 decks12 decks
16%synergy
Hide on the Ceiling
14%inclusion1 decks7 decks
12%synergy
Retraction Helix
13%inclusion2 decks15 decks
11%synergy
Run Away Together
13%inclusion2 decks15 decks
9%synergy
Brain Freeze
13%inclusion2 decks15 decks
9%synergy
Access Denied
13%inclusion2 decks15 decks
10%synergy
Reality Shift
13%inclusion2 decks15 decks
-13%synergy
Delay
13%inclusion2 decks15 decks
10%synergy
Consider
13%inclusion2 decks15 decks
-1%synergy
Otherworldly Gaze
13%inclusion2 decks15 decks
10%synergy
Stoic Rebuttal
13%inclusion2 decks15 decks
11%synergy
High Tide
13%inclusion2 decks15 decks
-31%synergy
Impulse
13%inclusion2 decks15 decks
9%synergy
Thought Scour
13%inclusion2 decks15 decks
6%synergy
Flow of Knowledge
13%inclusion2 decks15 decks
-2%synergy
Wizard's Retort
13%inclusion2 decks15 decks
9%synergy
Sink into Stupor
13%inclusion2 decks15 decks
-9%synergy
Miscast
13%inclusion2 decks15 decks
10%synergy
Scour for Scrap
8.3%inclusion1 decks12 decks
1%synergy
Stolen Uniform
7.7%inclusion1 decks13 decks
7%synergy
Assert Authority
6.7%inclusion1 decks15 decks
6%synergy
Consign to Memory
6.7%inclusion1 decks15 decks
5%synergy
Mental Misstep
6.7%inclusion1 decks15 decks
0%synergy
Steel Sabotage
6.7%inclusion1 decks15 decks
6%synergy
Chain of Vapor
6.7%inclusion1 decks15 decks
2%synergy
Three Steps Ahead
6.7%inclusion1 decks15 decks
-3%synergy
Refute
6.7%inclusion1 decks15 decks
1%synergy
Twitch
6.7%inclusion1 decks15 decks
5%synergy
Turn Aside
6.7%inclusion1 decks15 decks
5%synergy
Brainsurge
6.7%inclusion1 decks15 decks
-2%synergy
Twist Reality
6.7%inclusion1 decks15 decks
6%synergy
Reality Heist
6.7%inclusion1 decks15 decks
6%synergy
Thwart
6.7%inclusion1 decks15 decks
6%synergy
Banishing Knack
6.7%inclusion1 decks15 decks
5%synergy
Mana Drain
6.7%inclusion1 decks15 decks
-20%synergy
Stern Lesson
6.7%inclusion1 decks15 decks
6%synergy
Archmage's Charm
6.7%inclusion1 decks15 decks
-10%synergy
Flusterstorm
6.7%inclusion1 decks15 decks
-3%synergy
Sorceries
Thoughtcast
33%inclusion5 decks15 decks
25%synergy
Windfall
20%inclusion3 decks15 decks
-2%synergy
Fabricate
20%inclusion3 decks15 decks
-1%synergy
Boomerang Basics
20%inclusion1 decks5 decks
18%synergy
Reshape
13%inclusion2 decks15 decks
7%synergy
Preordain
13%inclusion2 decks15 decks
-10%synergy
One with the Machine
13%inclusion2 decks15 decks
10%synergy
Ravenform
13%inclusion2 decks15 decks
5%synergy
Ponder
6.7%inclusion1 decks15 decks
-23%synergy
Inundate
6.7%inclusion1 decks15 decks
5%synergy
Asinine Antics
6.7%inclusion1 decks15 decks
6%synergy
Stock Up
6.7%inclusion1 decks15 decks
3%synergy
Rush of Knowledge
6.7%inclusion1 decks15 decks
5%synergy
Devastation Tide
6.7%inclusion1 decks15 decks
4%synergy
Consuming Tide
6.7%inclusion1 decks15 decks
3%synergy
Sea Gate Restoration
6.7%inclusion1 decks15 decks
-8%synergy
Season of Weaving
6.7%inclusion1 decks15 decks
1%synergy
Lunar Insight
6.7%inclusion1 decks15 decks
5%synergy
Curse of the Swine
6.7%inclusion1 decks15 decks
-4%synergy
Treasure Cruise
6.7%inclusion1 decks15 decks
-4%synergy
Stolen by the Fae
6.7%inclusion1 decks15 decks
6%synergy
Anchor to Reality
6.7%inclusion1 decks15 decks
6%synergy
Flood of Tears
6.7%inclusion1 decks15 decks
3%synergy
Echo Storm
6.7%inclusion1 decks15 decks
6%synergy
Baral's Expertise
6.7%inclusion1 decks15 decks
5%synergy
Concentrate
6.7%inclusion1 decks15 decks
6%synergy
Spectral Deluge
6.7%inclusion1 decks15 decks
-4%synergy
Timetwister
6.7%inclusion1 decks15 decks
5%synergy
March of Progress
6.7%inclusion1 decks15 decks
5%synergy
Temporal Machinations
6.7%inclusion1 decks15 decks
7%synergy
Reverse Engineer
6.7%inclusion1 decks15 decks
6%synergy
Step Through
6.7%inclusion1 decks15 decks
1%synergy
Transmute Artifact
6.7%inclusion1 decks15 decks
3%synergy
Solve the Equation
6.7%inclusion1 decks15 decks
-5%synergy
Utility Artifacts
Soul-Guide Lantern
33%inclusion5 decks15 decks
29%synergy
Lightning Greaves
33%inclusion5 decks15 decks
7%synergy
Urza's Bauble
27%inclusion4 decks15 decks
22%synergy
Tormod's Crypt
27%inclusion4 decks15 decks
18%synergy
Moonsilver Key
27%inclusion4 decks15 decks
24%synergy
Sculpting Steel
27%inclusion4 decks15 decks
19%synergy
Isochron Scepter
27%inclusion4 decks15 decks
9%synergy
Waterbending Scroll
25%inclusion1 decks4 decks
17%synergy
Grinding Station
20%inclusion3 decks15 decks
18%synergy
Encroaching Mycosynth
20%inclusion3 decks15 decks
16%synergy
Aetherflux Reservoir
20%inclusion3 decks15 decks
14%synergy
Hammer of Nazahn
20%inclusion3 decks15 decks
19%synergy
Witching Well
20%inclusion3 decks15 decks
18%synergy
Sword of the Animist
20%inclusion3 decks15 decks
15%synergy
Blackblade Reforged
20%inclusion3 decks15 decks
15%synergy
Sword of Light and Shadow
13%inclusion2 decks15 decks
13%synergy
Mesmeric Orb
13%inclusion2 decks15 decks
9%synergy
Nettlecyst
13%inclusion2 decks15 decks
11%synergy
Sensei's Divining Top
13%inclusion2 decks15 decks
-1%synergy
Unwinding Clock
13%inclusion2 decks15 decks
2%synergy
Sword of Once and Future
13%inclusion2 decks15 decks
13%synergy
Sword of Fire and Ice
13%inclusion2 decks15 decks
13%synergy
Candlestick
13%inclusion2 decks15 decks
13%synergy
Perpetual Timepiece
13%inclusion2 decks15 decks
13%synergy
Thran Power Suit
13%inclusion2 decks15 decks
12%synergy
Thousand-Year Elixir
13%inclusion2 decks15 decks
10%synergy
Ichor Wellspring
13%inclusion2 decks15 decks
11%synergy
Clock of Omens
13%inclusion2 decks15 decks
11%synergy
Tarrian's Soulcleaver
13%inclusion2 decks15 decks
13%synergy
Lavaspur Boots
13%inclusion2 decks15 decks
11%synergy
Masterwork of Ingenuity
13%inclusion2 decks15 decks
13%synergy
Vexing Bauble
13%inclusion2 decks15 decks
12%synergy
Excalibur, Sword of Eden
13%inclusion2 decks15 decks
12%synergy
Winged Boots
13%inclusion2 decks15 decks
10%synergy
Sword of Hours
13%inclusion2 decks15 decks
13%synergy
Rings of Brighthearth
13%inclusion2 decks15 decks
7%synergy
Altar of the Brood
13%inclusion2 decks15 decks
10%synergy
Mask of Memory
13%inclusion2 decks15 decks
12%synergy
Sword of Vengeance
13%inclusion2 decks15 decks
12%synergy
Bident of Thassa
13%inclusion2 decks15 decks
1%synergy
Andúril, Flame of the West
13%inclusion2 decks15 decks
13%synergy
Adaptive Omnitool
13%inclusion2 decks15 decks
12%synergy
Sigiled Sword of Valeron
13%inclusion2 decks15 decks
13%synergy
Forebear's Blade
13%inclusion2 decks15 decks
13%synergy
Shadowspear
13%inclusion2 decks15 decks
12%synergy
Sword of Hearth and Home
13%inclusion2 decks15 decks
11%synergy
Sting, the Glinting Dagger
13%inclusion2 decks15 decks
12%synergy
Retrofitter Foundry
13%inclusion2 decks15 decks
12%synergy
Sword of War and Peace
13%inclusion2 decks15 decks
13%synergy
Cryogen Relic
8.3%inclusion1 decks12 decks
4%synergy
Enchantments
Efficient Construction
27%inclusion4 decks15 decks
20%synergy
Mirrodin Besieged
27%inclusion4 decks15 decks
22%synergy
Secrets of the Dead
27%inclusion4 decks15 decks
25%synergy
Intruder Alarm
20%inclusion3 decks15 decks
17%synergy
Artificer Class
20%inclusion3 decks15 decks
17%synergy
Thopter Spy Network
13%inclusion2 decks15 decks
5%synergy
Mystic Remora
13%inclusion2 decks15 decks
-13%synergy
Mechanized Production
6.7%inclusion1 decks15 decks
0%synergy
Frogify
6.7%inclusion1 decks15 decks
5%synergy
Clan Crafter
6.7%inclusion1 decks15 decks
6%synergy
Mirrormade
6.7%inclusion1 decks15 decks
1%synergy
Leyline of Anticipation
6.7%inclusion1 decks15 decks
-2%synergy
Aura of Dominion
6.7%inclusion1 decks15 decks
6%synergy
Inventive Iteration
6.7%inclusion1 decks15 decks
6%synergy
Propaganda
6.7%inclusion1 decks15 decks
-24%synergy
The Tale of Tamiyo
6.7%inclusion1 decks15 decks
6%synergy
Planeswalkers
Tezzeret, Cruel Captain
8.3%inclusion1 decks12 decks
2%synergy
Jace, Wielder of Mysteries
6.7%inclusion1 decks15 decks
-8%synergy
Utility Lands
Reliquary Tower
40%inclusion6 decks15 decks
-16%synergy
Archway of Innovation
33%inclusion5 decks15 decks
22%synergy
Castle Vantress
33%inclusion5 decks15 decks
15%synergy
Mystic Sanctuary
27%inclusion4 decks15 decks
-23%synergy
Buried Ruin
27%inclusion4 decks15 decks
14%synergy
Inventors' Fair
27%inclusion4 decks15 decks
14%synergy
Cephalid Coliseum
20%inclusion3 decks15 decks
11%synergy
Uthros, Titanic Godcore
17%inclusion2 decks12 decks
6%synergy
Minamo, School at Water's Edge
13%inclusion2 decks15 decks
1%synergy
Halimar Depths
13%inclusion2 decks15 decks
4%synergy
Riptide Laboratory
13%inclusion2 decks15 decks
4%synergy
Rivendell
13%inclusion2 decks15 decks
3%synergy
Urza's Saga
13%inclusion2 decks15 decks
-3%synergy
Academy Ruins
13%inclusion2 decks15 decks
-5%synergy
Otawara, Soaring City
13%inclusion2 decks15 decks
-12%synergy
Secluded Starforge
8.3%inclusion1 decks12 decks
7%synergy
Faerie Conclave
6.7%inclusion1 decks15 decks
5%synergy
Tomb of the Spirit Dragon
6.7%inclusion1 decks15 decks
5%synergy
Urza's Tower
6.7%inclusion1 decks15 decks
2%synergy
Urza's Mine
6.7%inclusion1 decks15 decks
2%synergy
Treasure Vault
6.7%inclusion1 decks15 decks
3%synergy
Tolaria West
6.7%inclusion1 decks15 decks
1%synergy
Urza's Factory
6.7%inclusion1 decks15 decks
6%synergy
Cathedral of War
6.7%inclusion1 decks15 decks
7%synergy
Ruins of Oran-Rief
6.7%inclusion1 decks15 decks
7%synergy
War Room
6.7%inclusion1 decks15 decks
-9%synergy
Emergence Zone
6.7%inclusion1 decks15 decks
2%synergy
Lonely Sandbar
6.7%inclusion1 decks15 decks
-7%synergy
Blast Zone
6.7%inclusion1 decks15 decks
5%synergy
Haunted Fengraf
6.7%inclusion1 decks15 decks
6%synergy
Volatile Fault
6.7%inclusion1 decks15 decks
6%synergy
Deserted Temple
6.7%inclusion1 decks15 decks
6%synergy
Tocasia's Dig Site
6.7%inclusion1 decks15 decks
6%synergy
Mishra's Factory
6.7%inclusion1 decks15 decks
5%synergy
Urza's Power Plant
6.7%inclusion1 decks15 decks
2%synergy
Rogue's Passage
6.7%inclusion1 decks15 decks
-9%synergy
Shelldock Isle
6.7%inclusion1 decks15 decks
6%synergy
Terrain Generator
6.7%inclusion1 decks15 decks
-1%synergy
Mishra's Foundry
6.7%inclusion1 decks15 decks
6%synergy
Sunken Palace
6.7%inclusion1 decks15 decks
3%synergy
Mana Artifacts
Sol Ring
87%inclusion13 decks15 decks
2%synergy
Arcane Signet
67%inclusion10 decks15 decks
2%synergy
Mind Stone
53%inclusion8 decks15 decks
18%synergy
Fellwar Stone
47%inclusion7 decks15 decks
27%synergy
Chromatic Sphere
33%inclusion5 decks15 decks
32%synergy
Lotus Petal
33%inclusion5 decks15 decks
21%synergy
Thran Dynamo
27%inclusion4 decks15 decks
14%synergy
Chromatic Star
27%inclusion4 decks15 decks
24%synergy
Thought Vessel
27%inclusion4 decks15 decks
-25%synergy
Mox Opal
27%inclusion4 decks15 decks
17%synergy
Mox Amber
20%inclusion3 decks15 decks
13%synergy
Patriar's Seal
20%inclusion3 decks15 decks
18%synergy
Intelligence Bobblehead
13%inclusion2 decks15 decks
12%synergy
Sky Diamond
13%inclusion2 decks15 decks
-9%synergy
Throne of Eldraine
13%inclusion2 decks15 decks
4%synergy
Endurance Bobblehead
13%inclusion2 decks15 decks
13%synergy
Charisma Bobblehead
13%inclusion2 decks15 decks
13%synergy
Liquimetal Torque
13%inclusion2 decks15 decks
7%synergy
Strength Bobblehead
13%inclusion2 decks15 decks
13%synergy
Luck Bobblehead
13%inclusion2 decks15 decks
12%synergy
Moonsnare Prototype
13%inclusion2 decks15 decks
11%synergy
Agility Bobblehead
13%inclusion2 decks15 decks
13%synergy
Crystal Skull, Isu Spyglass
13%inclusion2 decks15 decks
8%synergy
Prismatic Lens
13%inclusion2 decks15 decks
10%synergy
Perception Bobblehead
13%inclusion2 decks15 decks
13%synergy
Dreamstone Hedron
6.7%inclusion1 decks15 decks
5%synergy
Prophetic Prism
6.7%inclusion1 decks15 decks
6%synergy
Everflowing Chalice
6.7%inclusion1 decks15 decks
-9%synergy
Commander's Sphere
6.7%inclusion1 decks15 decks
-2%synergy
Altar of the Pantheon
6.7%inclusion1 decks15 decks
6%synergy
Golden Egg
6.7%inclusion1 decks15 decks
6%synergy
Hedron Archive
6.7%inclusion1 decks15 decks
1%synergy
Heraldic Banner
6.7%inclusion1 decks15 decks
1%synergy
The Aetherspark
6.7%inclusion1 decks15 decks
6%synergy
Strixhaven Stadium
6.7%inclusion1 decks15 decks
6%synergy
Machine God's Effigy
6.7%inclusion1 decks15 decks
4%synergy
Basalt Monolith
6.7%inclusion1 decks15 decks
-3%synergy
The Irencrag
6.7%inclusion1 decks15 decks
6%synergy
Terrarion
6.7%inclusion1 decks15 decks
7%synergy
Paradise Mantle
6.7%inclusion1 decks15 decks
4%synergy
Letter of Acceptance
6.7%inclusion1 decks15 decks
6%synergy
The Mightstone and Weakstone
6.7%inclusion1 decks15 decks
6%synergy
Sonic Screwdriver
6.7%inclusion1 decks15 decks
6%synergy
Energy Refractor
6.7%inclusion1 decks15 decks
6%synergy
Lands
Island
100%inclusion15 decks15 decks
6%synergy
Sink into Stupor
13%inclusion2 decks15 decks
-9%synergy
The Mycosynth Gardens
6.7%inclusion1 decks15 decks
1%synergy
Misty Rainforest
6.7%inclusion1 decks15 decks
-1%synergy
Myriad Landscape
6.7%inclusion1 decks15 decks
-19%synergy
Hidden Grotto
6.7%inclusion1 decks15 decks
6%synergy
Urza's Cave
6.7%inclusion1 decks15 decks
3%synergy
Sea Gate Restoration
6.7%inclusion1 decks15 decks
-8%synergy
Hydroelectric Specimen
6.7%inclusion1 decks15 decks
-7%synergy
Demolition Field
6.7%inclusion1 decks15 decks
1%synergy
Beyeen Veil
6.7%inclusion1 decks15 decks
6%synergy
Scalding Tarn
6.7%inclusion1 decks15 decks
-1%synergy
Polluted Delta
6.7%inclusion1 decks15 decks
-1%synergy
Flooded Strand
6.7%inclusion1 decks15 decks
-2%synergy
Jwari Disruption
6.7%inclusion1 decks15 decks
2%synergy
Gemstone Caverns
6.7%inclusion1 decks15 decks
1%synergy
Hall of Tagsin
6.7%inclusion1 decks15 decks
6%synergy