The Master of Keys (Commander) - Optimized

The Master of Keys
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Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
Harvey McGuinness
What if Thassa's Oracle Were Banned?
What would happen to cEDH if Thassa's Oracle were banned tomorrow? Would the best decks fall apart? Would there be a new meta? Let's discuss.
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Utility Artifacts
Enchantments
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Moonshadow
3.1%inclusion1 decks32 decks
3%synergy
Mornsong Aria
2.6%inclusion1 decks38 decks
2%synergy
Winnowing
2.6%inclusion1 decks38 decks
2%synergy
High Synergy Cards
Animate Dead
79%inclusion208 decks264 decks
69%synergy
Ripples of Undeath
67%inclusion177 decks264 decks
64%synergy
Necromancy
68%inclusion179 decks264 decks
63%synergy
Dress Down
63%inclusion165 decks264 decks
60%synergy
Mystic Remora
73%inclusion192 decks264 decks
52%synergy
Abdel Adrian, Gorion's Ward
53%inclusion140 decks264 decks
51%synergy
Entomb
58%inclusion153 decks264 decks
51%synergy
Inquisitive Glimmer
57%inclusion150 decks264 decks
49%synergy
Sevinne's Reclamation
58%inclusion153 decks264 decks
49%synergy
Entity Tracker
53%inclusion140 decks264 decks
47%synergy
Top Cards
Swords to Plowshares
63%inclusion166 decks264 decks
-5%synergy
Mesa Enchantress
52%inclusion138 decks264 decks
43%synergy
Mirrormade
50%inclusion133 decks264 decks
41%synergy
Blind Obedience
47%inclusion124 decks264 decks
35%synergy
Starfield Mystic
46%inclusion121 decks264 decks
39%synergy
Dance of the Dead
45%inclusion119 decks264 decks
43%synergy
Gravebreaker Lamia
44%inclusion117 decks264 decks
43%synergy
Dark Ritual
44%inclusion116 decks264 decks
24%synergy
An Offer You Can't Refuse
44%inclusion115 decks264 decks
17%synergy
Scrabbling Skullcrab
42%inclusion110 decks264 decks
41%synergy
Game Changers
Rhystic Study
65%inclusion172 decks264 decks
33%synergy
Smothering Tithe
61%inclusion162 decks264 decks
30%synergy
Enlightened Tutor
51%inclusion135 decks264 decks
31%synergy
Demonic Tutor
46%inclusion121 decks264 decks
25%synergy
Vampiric Tutor
40%inclusion106 decks264 decks
23%synergy
Thassa's Oracle
32%inclusion84 decks264 decks
22%synergy
Cyclonic Rift
32%inclusion84 decks264 decks
8%synergy
Fierce Guardianship
31%inclusion81 decks264 decks
10%synergy
Necropotence
29%inclusion77 decks264 decks
22%synergy
Ancient Tomb
29%inclusion76 decks264 decks
16%synergy
Creatures
Demon of Fate's Design
42%inclusion110 decks264 decks
36%synergy
Overlord of the Balemurk
38%inclusion100 decks264 decks
36%synergy
Esper Sentinel
37%inclusion98 decks264 decks
9%synergy
Ondu Spiritdancer
36%inclusion94 decks264 decks
29%synergy
Overlord of the Floodpits
35%inclusion93 decks264 decks
32%synergy
Fear of Sleep Paralysis
34%inclusion91 decks264 decks
29%synergy
Doomwake Giant
34%inclusion91 decks264 decks
29%synergy
Fear of Impostors
34%inclusion89 decks264 decks
32%synergy
Zur, Eternal Schemer
31%inclusion81 decks264 decks
27%synergy
Lotho, Corrupt Shirriff
30%inclusion79 decks264 decks
13%synergy
Grand Abolisher
29%inclusion77 decks264 decks
15%synergy
Victor, Valgavoth's Seneschal
28%inclusion74 decks264 decks
26%synergy
Hullbreaker Horror
24%inclusion63 decks264 decks
18%synergy
Zur the Enchanter
24%inclusion63 decks264 decks
19%synergy
Heliod, the Radiant Dawn
22%inclusion59 decks264 decks
19%synergy
Orcish Bowmasters
22%inclusion59 decks264 decks
11%synergy
Grim Guardian
22%inclusion58 decks264 decks
19%synergy
Valley Floodcaller
21%inclusion56 decks264 decks
17%synergy
Moon-Blessed Cleric
20%inclusion53 decks264 decks
15%synergy
Ledger Shredder
20%inclusion52 decks264 decks
11%synergy
Displacer Kitten
20%inclusion52 decks264 decks
13%synergy
Ghostly Dancers
19%inclusion49 decks264 decks
16%synergy
Enduring Curiosity
17%inclusion46 decks264 decks
10%synergy
Silent Hallcreeper
17%inclusion45 decks264 decks
13%synergy
Soaring Lightbringer
17%inclusion44 decks264 decks
12%synergy
Lurrus of the Dream-Den
16%inclusion41 decks264 decks
14%synergy
Aminatou, Veil Piercer
15%inclusion40 decks264 decks
14%synergy
Balemurk Leech
14%inclusion38 decks264 decks
14%synergy
Opposition Agent
13%inclusion35 decks264 decks
5%synergy
Hedron Crab
13%inclusion35 decks264 decks
13%synergy
Archon of Sun's Grace
13%inclusion33 decks264 decks
8%synergy
Ranger-Captain of Eos
12%inclusion32 decks264 decks
6%synergy
Archetype of Imagination
12%inclusion31 decks264 decks
7%synergy
Psychic Frog
12%inclusion31 decks264 decks
5%synergy
Talion, the Kindly Lord
12%inclusion31 decks264 decks
4%synergy
Gremlin Tamer
11%inclusion29 decks264 decks
10%synergy
Drannith Magistrate
11%inclusion28 decks264 decks
3%synergy
Mindwrack Harpy
11%inclusion28 decks264 decks
10%synergy
Wan Shi Tong, Librarian
10%inclusion8 decks78 decks
5%synergy
Skullsnap Nuisance
9.5%inclusion25 decks264 decks
9%synergy
Archivist of Oghma
9.5%inclusion25 decks264 decks
3%synergy
Voice of Victory
9.3%inclusion20 decks214 decks
1%synergy
Ancient Cellarspawn
9.1%inclusion24 decks264 decks
6%synergy
Leonin Relic-Warder
9.1%inclusion24 decks264 decks
9%synergy
Laboratory Maniac
8.7%inclusion23 decks264 decks
5%synergy
Overlord of the Mistmoors
8.7%inclusion23 decks264 decks
7%synergy
Mockingbird
8.3%inclusion22 decks264 decks
4%synergy
Athreos, Shroud-Veiled
8.3%inclusion22 decks264 decks
4%synergy
Faerie Mastermind
8.3%inclusion22 decks264 decks
-1%synergy
Spirited Companion
8.0%inclusion21 decks264 decks
6%synergy
Instants
Path to Exile
34%inclusion90 decks264 decks
-8%synergy
Swan Song
32%inclusion84 decks264 decks
12%synergy
Counterspell
31%inclusion82 decks264 decks
-10%synergy
Arcane Denial
30%inclusion78 decks264 decks
9%synergy
Mana Drain
28%inclusion73 decks264 decks
10%synergy
Silence
25%inclusion65 decks264 decks
14%synergy
Mystical Tutor
25%inclusion65 decks264 decks
13%synergy
Force of Will
23%inclusion62 decks264 decks
11%synergy
Flusterstorm
20%inclusion54 decks264 decks
12%synergy
Force of Negation
20%inclusion52 decks264 decks
8%synergy
Dovin's Veto
19%inclusion50 decks264 decks
-6%synergy
Gifts Ungiven
19%inclusion49 decks264 decks
16%synergy
Demonic Consultation
18%inclusion48 decks264 decks
10%synergy
Sink into Stupor
18%inclusion48 decks264 decks
5%synergy
Intuition
17%inclusion45 decks264 decks
15%synergy
Teferi's Protection
15%inclusion40 decks264 decks
-2%synergy
Cabal Ritual
15%inclusion40 decks264 decks
12%synergy
Borne Upon a Wind
15%inclusion39 decks264 decks
10%synergy
Tainted Pact
14%inclusion38 decks264 decks
7%synergy
Pact of Negation
14%inclusion36 decks264 decks
6%synergy
Frantic Search
13%inclusion35 decks264 decks
-4%synergy
Brainstorm
13%inclusion34 decks264 decks
-4%synergy
Inkshield
13%inclusion33 decks264 decks
3%synergy
Mindbreak Trap
12%inclusion31 decks264 decks
5%synergy
Thirst for Meaning
11%inclusion30 decks264 decks
10%synergy
Void Rend
11%inclusion30 decks264 decks
-23%synergy
Mental Misstep
11%inclusion29 decks264 decks
4%synergy
Otherworldly Gaze
10%inclusion27 decks264 decks
8%synergy
Into the Flood Maw
9.5%inclusion25 decks264 decks
6%synergy
Negate
8.7%inclusion23 decks264 decks
-8%synergy
Fell the Profane
7.6%inclusion20 decks264 decks
-1%synergy
Anguished Unmaking
7.6%inclusion20 decks264 decks
-18%synergy
Muddle the Mixture
7.6%inclusion20 decks264 decks
4%synergy
Deadly Rollick
6.4%inclusion17 decks264 decks
-8%synergy
Waterlogged Teachings
6.1%inclusion16 decks264 decks
2%synergy
Chain of Vapor
6.1%inclusion16 decks264 decks
3%synergy
Brain Freeze
6.1%inclusion16 decks264 decks
5%synergy
Utter End
6.1%inclusion16 decks264 decks
-1%synergy
Ad Nauseam
5.7%inclusion15 decks264 decks
3%synergy
Delay
5.7%inclusion15 decks264 decks
3%synergy
Retraction Helix
5.3%inclusion14 decks264 decks
5%synergy
Dispel
5.3%inclusion14 decks264 decks
2%synergy
Sorceries
Reanimate
30%inclusion78 decks264 decks
13%synergy
Windfall
30%inclusion78 decks264 decks
16%synergy
Redress Fate
25%inclusion66 decks264 decks
19%synergy
Toxic Deluge
22%inclusion59 decks264 decks
3%synergy
Demonic Counsel
14%inclusion36 decks264 decks
13%synergy
Lively Dirge
13%inclusion33 decks264 decks
11%synergy
Glimpse the Unthinkable
13%inclusion33 decks264 decks
12%synergy
Damn
13%inclusion33 decks264 decks
-8%synergy
Idyllic Tutor
12%inclusion31 decks264 decks
7%synergy
Singularity Rupture
11%inclusion15 decks131 decks
9%synergy
Unmarked Grave
11%inclusion30 decks264 decks
10%synergy
Supreme Verdict
11%inclusion28 decks264 decks
-4%synergy
Imperial Seal
10%inclusion27 decks264 decks
3%synergy
Extinguish All Hope
10%inclusion26 decks264 decks
8%synergy
Beseech the Mirror
8.7%inclusion23 decks264 decks
5%synergy
Replenish
8.3%inclusion22 decks264 decks
7%synergy
Dance of the Manse
8.3%inclusion22 decks264 decks
5%synergy
Time Wipe
7.6%inclusion20 decks264 decks
1%synergy
Buried Alive
7.2%inclusion19 decks264 decks
3%synergy
Farewell
6.8%inclusion18 decks264 decks
-6%synergy
Resurgent Belief
6.4%inclusion17 decks264 decks
4%synergy
Ponder
5.7%inclusion15 decks264 decks
-3%synergy
Utility Artifacts
The One Ring
26%inclusion69 decks264 decks
13%synergy
Mesmeric Orb
22%inclusion58 decks264 decks
21%synergy
Wishclaw Talisman
20%inclusion53 decks264 decks
12%synergy
Lightning Greaves
9.1%inclusion24 decks264 decks
-13%synergy
Sensei's Divining Top
6.8%inclusion18 decks264 decks
-3%synergy
Cloud Key
5.3%inclusion14 decks264 decks
2%synergy
Enchantments
Amphibian Downpour
42%inclusion110 decks264 decks
37%synergy
Sphere of Safety
40%inclusion106 decks264 decks
31%synergy
Secret Arcade // Dusty Parlor
38%inclusion101 decks264 decks
33%synergy
Propaganda
36%inclusion95 decks264 decks
9%synergy
Ghostly Prison
32%inclusion85 decks264 decks
10%synergy
Seal of Cleansing
32%inclusion84 decks264 decks
30%synergy
Grasp of Fate
32%inclusion84 decks264 decks
26%synergy
The Meathook Massacre
30%inclusion79 decks264 decks
26%synergy
Tinybones Joins Up
30%inclusion79 decks264 decks
29%synergy
Cemetery Tampering
26%inclusion68 decks264 decks
25%synergy
Starfield of Nyx
25%inclusion67 decks264 decks
21%synergy
Sigil of the Empty Throne
25%inclusion65 decks264 decks
19%synergy
Estrid's Invocation
24%inclusion63 decks264 decks
19%synergy
Touch the Spirit Realm
22%inclusion57 decks264 decks
19%synergy
Monologue Tax
21%inclusion55 decks264 decks
15%synergy
Static Prison
20%inclusion54 decks264 decks
20%synergy
Greater Auramancy
19%inclusion51 decks264 decks
15%synergy
Cacophony Unleashed
19%inclusion51 decks264 decks
18%synergy
Darksteel Mutation
19%inclusion50 decks264 decks
13%synergy
Black Market Connections
18%inclusion47 decks264 decks
4%synergy
Seal of Removal
17%inclusion46 decks264 decks
17%synergy
Leyline of Anticipation
16%inclusion43 decks264 decks
12%synergy
Out of the Tombs
16%inclusion42 decks264 decks
15%synergy
Shark Typhoon
16%inclusion42 decks264 decks
10%synergy
Stillness in Motion
15%inclusion30 decks206 decks
14%synergy
Extravagant Replication
14%inclusion38 decks264 decks
9%synergy
Phyrexian Arena
14%inclusion38 decks264 decks
0%synergy
Trouble in Pairs
14%inclusion38 decks264 decks
9%synergy
Defiled Crypt // Cadaver Lab
14%inclusion36 decks264 decks
13%synergy
The Tale of Tamiyo
13%inclusion35 decks264 decks
13%synergy
Timely Ward
13%inclusion35 decks264 decks
8%synergy
Authority of the Consuls
13%inclusion33 decks264 decks
1%synergy
Enchanted Evening
13%inclusion33 decks264 decks
11%synergy
Copy Enchantment
12%inclusion31 decks264 decks
7%synergy
Polluted Cistern // Dim Oubliette
12%inclusion31 decks264 decks
11%synergy
Land Tax
12%inclusion31 decks264 decks
6%synergy
Sheltered by Ghosts
11%inclusion30 decks264 decks
9%synergy
The Eldest Reborn
11%inclusion29 decks264 decks
8%synergy
Imprisoned in the Moon
11%inclusion28 decks264 decks
4%synergy
Mirror Room // Fractured Realm
11%inclusion28 decks264 decks
8%synergy
Aura of Silence
11%inclusion28 decks264 decks
7%synergy
Restricted Office // Lecture Hall
10%inclusion26 decks264 decks
8%synergy
Bottomless Pool // Locker Room
10%inclusion26 decks264 decks
8%synergy
Teval's Judgment
9.5%inclusion20 decks211 decks
9%synergy
Court of Cunning
9.5%inclusion25 decks264 decks
8%synergy
Ethereal Armor
9.5%inclusion25 decks264 decks
5%synergy
Hallowed Haunting
9.5%inclusion25 decks264 decks
7%synergy
Oubliette
9.5%inclusion25 decks264 decks
8%synergy
All That Glitters
9.5%inclusion25 decks264 decks
1%synergy
One with the Multiverse
9.1%inclusion24 decks264 decks
4%synergy
Planeswalkers
Teferi, Time Raveler
21%inclusion56 decks264 decks
13%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion145 decks264 decks
42%synergy
Otawara, Soaring City
37%inclusion97 decks264 decks
18%synergy
Bojuka Bog
35%inclusion92 decks264 decks
8%synergy
Takenuma, Abandoned Mire
20%inclusion54 decks264 decks
14%synergy
Urza's Saga
19%inclusion49 decks264 decks
7%synergy
Serra's Sanctum
17%inclusion46 decks264 decks
16%synergy
Reliquary Tower
15%inclusion39 decks264 decks
-19%synergy
Cephalid Coliseum
14%inclusion38 decks264 decks
11%synergy
Urborg, Tomb of Yawgmoth
14%inclusion37 decks264 decks
1%synergy
Emergence Zone
13%inclusion33 decks264 decks
10%synergy
Halimar Depths
9.5%inclusion25 decks264 decks
5%synergy
Minamo, School at Water's Edge
7.2%inclusion19 decks264 decks
3%synergy
Rogue's Passage
5.3%inclusion14 decks264 decks
-4%synergy
Eiganjo, Seat of the Empire
5.3%inclusion14 decks264 decks
0%synergy
Mana Artifacts
Sol Ring
94%inclusion247 decks264 decks
4%synergy
Arcane Signet
92%inclusion242 decks264 decks
4%synergy
Talisman of Dominance
57%inclusion151 decks264 decks
8%synergy
Talisman of Hierarchy
52%inclusion136 decks264 decks
8%synergy
Talisman of Progress
51%inclusion135 decks264 decks
8%synergy
Fellwar Stone
42%inclusion112 decks264 decks
9%synergy
Azorius Signet
36%inclusion94 decks264 decks
4%synergy
Orzhov Signet
33%inclusion86 decks264 decks
-1%synergy
Mana Vault
24%inclusion63 decks264 decks
15%synergy
Lotus Petal
23%inclusion62 decks264 decks
13%synergy
Dimir Signet
23%inclusion62 decks264 decks
-8%synergy
Chrome Mox
20%inclusion52 decks264 decks
10%synergy
Mind Stone
13%inclusion34 decks264 decks
0%synergy
Mox Opal
12%inclusion32 decks264 decks
3%synergy
Mox Diamond
10%inclusion27 decks264 decks
3%synergy
Mox Amber
10%inclusion27 decks264 decks
4%synergy
Lion's Eye Diamond
9.1%inclusion24 decks264 decks
7%synergy
Commander's Sphere
8.7%inclusion23 decks264 decks
-10%synergy
Thought Vessel
7.2%inclusion19 decks264 decks
-17%synergy
Basalt Monolith
5.7%inclusion15 decks264 decks
3%synergy
Lands
Command Tower
94%inclusion249 decks264 decks
2%synergy
Island
91%inclusion240 decks264 decks
-2%synergy
Swamp
91%inclusion239 decks264 decks
-1%synergy
Plains
90%inclusion237 decks264 decks
-2%synergy
Watery Grave
66%inclusion173 decks264 decks
15%synergy
Hallowed Fountain
65%inclusion172 decks264 decks
16%synergy
Godless Shrine
64%inclusion168 decks264 decks
13%synergy
Flooded Strand
60%inclusion158 decks264 decks
22%synergy
Polluted Delta
59%inclusion156 decks264 decks
22%synergy
Marsh Flats
56%inclusion149 decks264 decks
20%synergy
Exotic Orchard
53%inclusion139 decks264 decks
-6%synergy
Raffine's Tower
49%inclusion130 decks264 decks
8%synergy
Caves of Koilos
48%inclusion127 decks264 decks
13%synergy
Adarkar Wastes
46%inclusion121 decks264 decks
15%synergy
Underground River
45%inclusion120 decks264 decks
12%synergy
Sea of Clouds
45%inclusion119 decks264 decks
10%synergy
Arcane Sanctum
42%inclusion110 decks264 decks
-13%synergy
Vault of Champions
42%inclusion110 decks264 decks
9%synergy
Undercity Sewers
41%inclusion109 decks264 decks
27%synergy
Morphic Pool
41%inclusion109 decks264 decks
7%synergy
Shadowy Backstreet
35%inclusion93 decks264 decks
23%synergy
Glacial Fortress
35%inclusion92 decks264 decks
-6%synergy
Meticulous Archive
35%inclusion92 decks264 decks
21%synergy
Isolated Chapel
30%inclusion79 decks264 decks
-10%synergy
Tundra
25%inclusion67 decks264 decks
9%synergy
City of Brass
25%inclusion67 decks264 decks
10%synergy
Scrubland
24%inclusion64 decks264 decks
8%synergy
Underground Sea
24%inclusion64 decks264 decks
8%synergy
Floodfarm Verge
23%inclusion61 decks264 decks
12%synergy
Drowned Catacomb
23%inclusion61 decks264 decks
-13%synergy
Azorius Chancery
23%inclusion60 decks264 decks
9%synergy
Prairie Stream
22%inclusion59 decks264 decks
-18%synergy
Bloodstained Mire
22%inclusion58 decks264 decks
11%synergy
Gloomlake Verge
22%inclusion58 decks264 decks
11%synergy
Dimir Aqueduct
21%inclusion55 decks264 decks
7%synergy
Tainted Isle
21%inclusion55 decks264 decks
14%synergy
Mana Confluence
20%inclusion54 decks264 decks
7%synergy
Sunken Hollow
20%inclusion54 decks264 decks
-19%synergy
Valgavoth's Lair
20%inclusion53 decks264 decks
17%synergy
Orzhov Basilica
20%inclusion53 decks264 decks
4%synergy
Misty Rainforest
20%inclusion52 decks264 decks
9%synergy
Windswept Heath
20%inclusion52 decks264 decks
10%synergy
Tainted Field
20%inclusion52 decks264 decks
13%synergy
Verdant Catacombs
20%inclusion52 decks264 decks
9%synergy
Temple of Enlightenment
19%inclusion51 decks264 decks
3%synergy
Temple of Deceit
19%inclusion51 decks264 decks
1%synergy
Temple of Silence
19%inclusion51 decks264 decks
0%synergy
Scalding Tarn
18%inclusion48 decks264 decks
7%synergy
Sink into Stupor
18%inclusion48 decks264 decks
5%synergy
Terramorphic Expanse
17%inclusion45 decks264 decks
1%synergy
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