The Master of Keys (Commander) - Optimized Combo

Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
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.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Animate Dead
86%inclusion32 decks37 decks
77%synergy
Necromancy
76%inclusion28 decks37 decks
71%synergy
Abdel Adrian, Gorion's Ward
70%inclusion26 decks37 decks
69%synergy
Ripples of Undeath
59%inclusion22 decks37 decks
57%synergy
Sevinne's Reclamation
65%inclusion24 decks37 decks
56%synergy
Entomb
62%inclusion23 decks37 decks
55%synergy
Mystic Remora
76%inclusion28 decks37 decks
55%synergy
Dress Down
51%inclusion19 decks37 decks
49%synergy
The Meathook Massacre
49%inclusion18 decks37 decks
45%synergy
Tinybones Joins Up
46%inclusion17 decks37 decks
45%synergy
Top Cards
Swords to Plowshares
68%inclusion25 decks37 decks
0%synergy
Esper Sentinel
62%inclusion23 decks37 decks
35%synergy
Dark Ritual
59%inclusion22 decks37 decks
40%synergy
Swan Song
51%inclusion19 decks37 decks
32%synergy
Blind Obedience
49%inclusion18 decks37 decks
37%synergy
Lotho, Corrupt Shirriff
46%inclusion17 decks37 decks
29%synergy
Dance of the Dead
46%inclusion17 decks37 decks
44%synergy
An Offer You Can't Refuse
46%inclusion17 decks37 decks
19%synergy
Silence
41%inclusion15 decks37 decks
30%synergy
Amphibian Downpour
41%inclusion15 decks37 decks
36%synergy
Game Changers
Smothering Tithe
73%inclusion27 decks37 decks
42%synergy
Rhystic Study
73%inclusion27 decks37 decks
42%synergy
Enlightened Tutor
65%inclusion24 decks37 decks
46%synergy
Vampiric Tutor
65%inclusion24 decks37 decks
48%synergy
Demonic Tutor
62%inclusion23 decks37 decks
42%synergy
Necropotence
51%inclusion19 decks37 decks
45%synergy
Thassa's Oracle
49%inclusion18 decks37 decks
40%synergy
Ancient Tomb
46%inclusion17 decks37 decks
33%synergy
The One Ring
46%inclusion17 decks37 decks
33%synergy
Force of Will
41%inclusion15 decks37 decks
28%synergy
Creatures
Orcish Bowmasters
41%inclusion15 decks37 decks
30%synergy
Valley Floodcaller
35%inclusion13 decks37 decks
31%synergy
Entity Tracker
35%inclusion13 decks37 decks
29%synergy
Ledger Shredder
35%inclusion13 decks37 decks
26%synergy
Inquisitive Glimmer
32%inclusion12 decks37 decks
25%synergy
Grand Abolisher
32%inclusion12 decks37 decks
18%synergy
Mesa Enchantress
30%inclusion11 decks37 decks
21%synergy
Grim Guardian
30%inclusion11 decks37 decks
27%synergy
Displacer Kitten
27%inclusion10 decks37 decks
20%synergy
Opposition Agent
27%inclusion10 decks37 decks
19%synergy
Overlord of the Balemurk
27%inclusion10 decks37 decks
25%synergy
Hedron Crab
27%inclusion10 decks37 decks
26%synergy
Mockingbird
27%inclusion10 decks37 decks
23%synergy
Voice of Victory
26%inclusion9 decks34 decks
18%synergy
Wan Shi Tong, Librarian
25%inclusion4 decks16 decks
20%synergy
Gravebreaker Lamia
24%inclusion9 decks37 decks
23%synergy
Overlord of the Floodpits
24%inclusion9 decks37 decks
21%synergy
Demon of Fate's Design
24%inclusion9 decks37 decks
19%synergy
Talion, the Kindly Lord
24%inclusion9 decks37 decks
17%synergy
Hullbreaker Horror
24%inclusion9 decks37 decks
18%synergy
Archivist of Oghma
22%inclusion8 decks37 decks
15%synergy
Scrabbling Skullcrab
22%inclusion8 decks37 decks
21%synergy
Lurrus of the Dream-Den
22%inclusion8 decks37 decks
20%synergy
Fear of Impostors
22%inclusion8 decks37 decks
20%synergy
Ranger-Captain of Eos
22%inclusion8 decks37 decks
15%synergy
Starfield Mystic
19%inclusion7 decks37 decks
12%synergy
Leonin Relic-Warder
19%inclusion7 decks37 decks
19%synergy
Laboratory Maniac
19%inclusion7 decks37 decks
16%synergy
Zur, Eternal Schemer
19%inclusion7 decks37 decks
16%synergy
Psychic Frog
19%inclusion7 decks37 decks
12%synergy
Ghostly Pilferer
19%inclusion7 decks37 decks
12%synergy
Snapcaster Mage
16%inclusion6 decks37 decks
14%synergy
Victor, Valgavoth's Seneschal
16%inclusion6 decks37 decks
14%synergy
Faerie Mastermind
16%inclusion6 decks37 decks
7%synergy
Enduring Curiosity
16%inclusion6 decks37 decks
8%synergy
Heliod, the Radiant Dawn
16%inclusion6 decks37 decks
13%synergy
Ondu Spiritdancer
16%inclusion6 decks37 decks
10%synergy
Hoarding Broodlord
14%inclusion5 decks37 decks
12%synergy
Phyrexian Metamorph
14%inclusion5 decks37 decks
5%synergy
Moon-Blessed Cleric
14%inclusion5 decks37 decks
9%synergy
Drannith Magistrate
14%inclusion5 decks37 decks
6%synergy
Fear of Sleep Paralysis
14%inclusion5 decks37 decks
8%synergy
Gremlin Tamer
14%inclusion5 decks37 decks
13%synergy
Witch Enchanter
11%inclusion4 decks37 decks
4%synergy
Sheoldred, the Apocalypse
11%inclusion4 decks37 decks
2%synergy
Walking Ballista
11%inclusion4 decks37 decks
8%synergy
Heliod, Sun-Crowned
11%inclusion4 decks37 decks
7%synergy
Balemurk Leech
11%inclusion4 decks37 decks
10%synergy
Doomwake Giant
11%inclusion4 decks37 decks
5%synergy
Ghostly Dancers
11%inclusion4 decks37 decks
8%synergy
Instants
Force of Negation
41%inclusion15 decks37 decks
29%synergy
Path to Exile
41%inclusion15 decks37 decks
-2%synergy
Mystical Tutor
41%inclusion15 decks37 decks
30%synergy
Cyclonic Rift
38%inclusion14 decks37 decks
15%synergy
Sink into Stupor
35%inclusion13 decks37 decks
22%synergy
Counterspell
35%inclusion13 decks37 decks
-7%synergy
Gifts Ungiven
32%inclusion12 decks37 decks
30%synergy
Cabal Ritual
32%inclusion12 decks37 decks
29%synergy
Flusterstorm
32%inclusion12 decks37 decks
25%synergy
Demonic Consultation
32%inclusion12 decks37 decks
25%synergy
Fierce Guardianship
30%inclusion11 decks37 decks
9%synergy
Mana Drain
27%inclusion10 decks37 decks
10%synergy
Borne Upon a Wind
24%inclusion9 decks37 decks
19%synergy
Teferi's Protection
22%inclusion8 decks37 decks
5%synergy
Tainted Pact
22%inclusion8 decks37 decks
15%synergy
Mental Misstep
22%inclusion8 decks37 decks
15%synergy
Into the Flood Maw
22%inclusion8 decks37 decks
18%synergy
Pact of Negation
22%inclusion8 decks37 decks
14%synergy
Dovin's Veto
19%inclusion7 decks37 decks
-7%synergy
Intuition
19%inclusion7 decks37 decks
17%synergy
Mindbreak Trap
19%inclusion7 decks37 decks
12%synergy
Arcane Denial
19%inclusion7 decks37 decks
-1%synergy
Deadly Rollick
16%inclusion6 decks37 decks
1%synergy
Muddle the Mixture
16%inclusion6 decks37 decks
12%synergy
Retraction Helix
16%inclusion6 decks37 decks
15%synergy
Brainstorm
16%inclusion6 decks37 decks
-1%synergy
Void Rend
16%inclusion6 decks37 decks
-18%synergy
Frantic Search
14%inclusion5 decks37 decks
-4%synergy
Brain Freeze
14%inclusion5 decks37 decks
13%synergy
Sacrifice
11%inclusion4 decks37 decks
10%synergy
Fell the Profane
11%inclusion4 decks37 decks
2%synergy
Culling the Weak
11%inclusion4 decks37 decks
9%synergy
Strix Serenade
11%inclusion4 decks37 decks
7%synergy
Ad Nauseam
11%inclusion4 decks37 decks
9%synergy
Waterlogged Teachings
11%inclusion4 decks37 decks
6%synergy
Saw in Half
11%inclusion4 decks37 decks
9%synergy
Chain of Vapor
8.1%inclusion3 decks37 decks
5%synergy
Orim's Chant
8.1%inclusion3 decks37 decks
7%synergy
Negate
8.1%inclusion3 decks37 decks
-8%synergy
Dawn's Truce
8.1%inclusion3 decks37 decks
4%synergy
Angel's Grace
8.1%inclusion3 decks37 decks
6%synergy
Dispel
8.1%inclusion3 decks37 decks
5%synergy
Banishing Knack
8.1%inclusion3 decks37 decks
8%synergy
Opt
8.1%inclusion3 decks37 decks
4%synergy
Anguished Unmaking
8.1%inclusion3 decks37 decks
-17%synergy
Drown in the Loch
5.4%inclusion2 decks37 decks
3%synergy
Clutch of the Undercity
5.4%inclusion2 decks37 decks
5%synergy
Darkblast
5.4%inclusion2 decks37 decks
5%synergy
Final Showdown
5.4%inclusion2 decks37 decks
4%synergy
Perplex
5.4%inclusion2 decks37 decks
4%synergy
Sorceries
Toxic Deluge
41%inclusion15 decks37 decks
21%synergy
Windfall
38%inclusion14 decks37 decks
25%synergy
Reanimate
38%inclusion14 decks37 decks
22%synergy
Imperial Seal
19%inclusion7 decks37 decks
12%synergy
Lively Dirge
16%inclusion6 decks37 decks
15%synergy
Damn
16%inclusion6 decks37 decks
-4%synergy
Unmarked Grave
14%inclusion5 decks37 decks
12%synergy
Farewell
11%inclusion4 decks37 decks
-2%synergy
Idyllic Tutor
11%inclusion4 decks37 decks
7%synergy
Demonic Counsel
11%inclusion4 decks37 decks
10%synergy
Cabal Therapy
8.1%inclusion3 decks37 decks
8%synergy
Resurgent Belief
8.1%inclusion3 decks37 decks
6%synergy
Gitaxian Probe
8.1%inclusion3 decks37 decks
6%synergy
Yawgmoth's Will
8.1%inclusion3 decks37 decks
7%synergy
Dread Return
8.1%inclusion3 decks37 decks
5%synergy
Buried Alive
8.1%inclusion3 decks37 decks
4%synergy
Mnemonic Betrayal
8.1%inclusion3 decks37 decks
5%synergy
Beseech the Mirror
8.1%inclusion3 decks37 decks
4%synergy
Traumatize
8.1%inclusion3 decks37 decks
8%synergy
Singularity Rupture
8.0%inclusion2 decks25 decks
6%synergy
Supreme Verdict
5.4%inclusion2 decks37 decks
-9%synergy
Diabolic Intent
5.4%inclusion2 decks37 decks
1%synergy
Diabolic Tutor
5.4%inclusion2 decks37 decks
1%synergy
Repay in Kind
5.4%inclusion2 decks37 decks
5%synergy
Torment of Hailfire
5.4%inclusion2 decks37 decks
4%synergy
Wrath of God
5.4%inclusion2 decks37 decks
2%synergy
Unearth
5.4%inclusion2 decks37 decks
4%synergy
Cut Your Losses
5.4%inclusion2 decks37 decks
5%synergy
Feed the Swarm
5.4%inclusion2 decks37 decks
2%synergy
Vanquish the Horde
5.4%inclusion2 decks37 decks
3%synergy
Grim Tutor
5.4%inclusion2 decks37 decks
1%synergy
Unburial Rites
5.4%inclusion2 decks37 decks
2%synergy
Damnation
5.4%inclusion2 decks37 decks
3%synergy
Dance of the Manse
5.4%inclusion2 decks37 decks
2%synergy
Utility Artifacts
Wishclaw Talisman
35%inclusion13 decks37 decks
27%synergy
Mesmeric Orb
22%inclusion8 decks37 decks
21%synergy
Sensei's Divining Top
19%inclusion7 decks37 decks
9%synergy
Bolas's Citadel
8.1%inclusion3 decks37 decks
-1%synergy
Expedition Map
8.1%inclusion3 decks37 decks
7%synergy
Altar of the Brood
8.1%inclusion3 decks37 decks
7%synergy
Lightning Greaves
8.1%inclusion3 decks37 decks
-15%synergy
Isochron Scepter
8.1%inclusion3 decks37 decks
6%synergy
Marina Vendrell's Grimoire
5.4%inclusion2 decks37 decks
4%synergy
Mirror of Fate
5.4%inclusion2 decks37 decks
5%synergy
Crucible of Worlds
5.4%inclusion2 decks37 decks
5%synergy
Aetherflux Reservoir
5.4%inclusion2 decks37 decks
-2%synergy
Mirage Mirror
5.4%inclusion2 decks37 decks
4%synergy
Agatha's Soul Cauldron
5.4%inclusion2 decks37 decks
5%synergy
Tainted Sigil
5.4%inclusion2 decks37 decks
5%synergy
Codex Shredder
5.4%inclusion2 decks37 decks
5%synergy
Enchantments
Mirrormade
38%inclusion14 decks37 decks
28%synergy
Propaganda
30%inclusion11 decks37 decks
2%synergy
Seal of Cleansing
27%inclusion10 decks37 decks
26%synergy
Touch the Spirit Realm
24%inclusion9 decks37 decks
22%synergy
Static Prison
24%inclusion9 decks37 decks
24%synergy
Ghostly Prison
24%inclusion9 decks37 decks
2%synergy
Court of Cunning
22%inclusion8 decks37 decks
21%synergy
Enchanted Evening
22%inclusion8 decks37 decks
20%synergy
Secret Arcade // Dusty Parlor
22%inclusion8 decks37 decks
17%synergy
Trouble in Pairs
22%inclusion8 decks37 decks
16%synergy
Grasp of Fate
19%inclusion7 decks37 decks
13%synergy
Out of the Tombs
19%inclusion7 decks37 decks
18%synergy
Sphere of Safety
19%inclusion7 decks37 decks
10%synergy
Stillness in Motion
15%inclusion5 decks34 decks
14%synergy
Estrid's Invocation
14%inclusion5 decks37 decks
9%synergy
Starfield of Nyx
14%inclusion5 decks37 decks
9%synergy
Teval's Judgment
12%inclusion4 decks34 decks
11%synergy
Founding the Third Path
11%inclusion4 decks37 decks
11%synergy
Copy Artifact
11%inclusion4 decks37 decks
10%synergy
Cemetery Tampering
11%inclusion4 decks37 decks
10%synergy
Leyline of Anticipation
11%inclusion4 decks37 decks
6%synergy
Monologue Tax
11%inclusion4 decks37 decks
4%synergy
Black Market Connections
11%inclusion4 decks37 decks
-4%synergy
Chthonian Nightmare
11%inclusion4 decks37 decks
10%synergy
Greater Auramancy
11%inclusion4 decks37 decks
6%synergy
Bloodchief Ascension
11%inclusion4 decks37 decks
5%synergy
Dollmaker's Shop // Porcelain Gallery
11%inclusion4 decks37 decks
10%synergy
Counterbalance
8.1%inclusion3 decks37 decks
7%synergy
Cacophony Unleashed
8.1%inclusion3 decks37 decks
6%synergy
Sigil of the Empty Throne
8.1%inclusion3 decks37 decks
2%synergy
Authority of the Consuls
8.1%inclusion3 decks37 decks
-4%synergy
All That Glitters
8.1%inclusion3 decks37 decks
-1%synergy
Mirror Room // Fractured Realm
8.1%inclusion3 decks37 decks
6%synergy
Land Tax
8.1%inclusion3 decks37 decks
2%synergy
Solitary Confinement
8.1%inclusion3 decks37 decks
6%synergy
Nowhere to Run
8.1%inclusion3 decks37 decks
7%synergy
Hallowed Haunting
8.1%inclusion3 decks37 decks
6%synergy
Aura of Silence
8.1%inclusion3 decks37 decks
5%synergy
Seal of Removal
8.1%inclusion3 decks37 decks
8%synergy
Endless Evil
5.4%inclusion2 decks37 decks
5%synergy
Parallax Wave
5.4%inclusion2 decks37 decks
5%synergy
Imprisoned in the Moon
5.4%inclusion2 decks37 decks
-1%synergy
Chronic Flooding
5.4%inclusion2 decks37 decks
5%synergy
Extravagant Replication
5.4%inclusion2 decks37 decks
0%synergy
Opalescence
5.4%inclusion2 decks37 decks
5%synergy
Phyrexian Unlife
5.4%inclusion2 decks37 decks
4%synergy
Lich
5.4%inclusion2 decks37 decks
5%synergy
Hopeless Nightmare
5.4%inclusion2 decks37 decks
5%synergy
Dance of Many
5.4%inclusion2 decks37 decks
5%synergy
Followed Footsteps
5.4%inclusion2 decks37 decks
4%synergy
Planeswalkers
Teferi, Time Raveler
30%inclusion11 decks37 decks
22%synergy
Jace, Wielder of Mysteries
5.4%inclusion2 decks37 decks
4%synergy
Narset, Parter of Veils
5.4%inclusion2 decks37 decks
2%synergy
Utility Lands
Otawara, Soaring City
46%inclusion17 decks37 decks
27%synergy
Hall of Heliod's Generosity
38%inclusion14 decks37 decks
25%synergy
Urza's Saga
32%inclusion12 decks37 decks
21%synergy
Urborg, Tomb of Yawgmoth
27%inclusion10 decks37 decks
14%synergy
Emergence Zone
22%inclusion8 decks37 decks
20%synergy
Cephalid Coliseum
22%inclusion8 decks37 decks
18%synergy
Takenuma, Abandoned Mire
19%inclusion7 decks37 decks
13%synergy
Bojuka Bog
14%inclusion5 decks37 decks
-13%synergy
Serra's Sanctum
14%inclusion5 decks37 decks
12%synergy
Reliquary Tower
14%inclusion5 decks37 decks
-20%synergy
Mistrise Village
8.8%inclusion3 decks34 decks
5%synergy
Minamo, School at Water's Edge
8.1%inclusion3 decks37 decks
4%synergy
Shizo, Death's Storehouse
5.4%inclusion2 decks37 decks
3%synergy
Phyrexian Tower
5.4%inclusion2 decks37 decks
2%synergy
Maze of Ith
5.4%inclusion2 decks37 decks
3%synergy
Cabal Coffers
5.4%inclusion2 decks37 decks
2%synergy
Eiganjo, Seat of the Empire
5.4%inclusion2 decks37 decks
0%synergy
Academy Ruins
5.4%inclusion2 decks37 decks
-1%synergy
City of Traitors
5.4%inclusion2 decks37 decks
4%synergy
Mana Artifacts
Sol Ring
100%inclusion37 decks37 decks
10%synergy
Arcane Signet
95%inclusion35 decks37 decks
7%synergy
Talisman of Dominance
81%inclusion30 decks37 decks
31%synergy
Talisman of Progress
62%inclusion23 decks37 decks
18%synergy
Talisman of Hierarchy
57%inclusion21 decks37 decks
13%synergy
Fellwar Stone
51%inclusion19 decks37 decks
18%synergy
Mana Vault
35%inclusion13 decks37 decks
26%synergy
Chrome Mox
35%inclusion13 decks37 decks
26%synergy
Lotus Petal
32%inclusion12 decks37 decks
22%synergy
Mox Opal
24%inclusion9 decks37 decks
16%synergy
Mox Diamond
22%inclusion8 decks37 decks
15%synergy
Mox Amber
19%inclusion7 decks37 decks
13%synergy
Azorius Signet
19%inclusion7 decks37 decks
-12%synergy
Dimir Signet
16%inclusion6 decks37 decks
-15%synergy
Orzhov Signet
16%inclusion6 decks37 decks
-16%synergy
Lion's Eye Diamond
14%inclusion5 decks37 decks
11%synergy
Mind Stone
8.1%inclusion3 decks37 decks
-4%synergy
Commander's Sphere
5.4%inclusion2 decks37 decks
-13%synergy
Grim Monolith
5.4%inclusion2 decks37 decks
2%synergy
Basalt Monolith
5.4%inclusion2 decks37 decks
3%synergy
Lands
Command Tower
95%inclusion35 decks37 decks
2%synergy
Island
84%inclusion31 decks37 decks
-9%synergy
Watery Grave
84%inclusion31 decks37 decks
33%synergy
Swamp
81%inclusion30 decks37 decks
-11%synergy
Plains
81%inclusion30 decks37 decks
-11%synergy
Flooded Strand
81%inclusion30 decks37 decks
43%synergy
Godless Shrine
76%inclusion28 decks37 decks
24%synergy
Marsh Flats
76%inclusion28 decks37 decks
40%synergy
Polluted Delta
76%inclusion28 decks37 decks
38%synergy
Hallowed Fountain
76%inclusion28 decks37 decks
25%synergy
Exotic Orchard
65%inclusion24 decks37 decks
6%synergy
Sea of Clouds
54%inclusion20 decks37 decks
19%synergy
Morphic Pool
51%inclusion19 decks37 decks
17%synergy
Raffine's Tower
46%inclusion17 decks37 decks
5%synergy
Glacial Fortress
41%inclusion15 decks37 decks
-1%synergy
Tundra
41%inclusion15 decks37 decks
25%synergy
Undercity Sewers
41%inclusion15 decks37 decks
26%synergy
Underground River
41%inclusion15 decks37 decks
7%synergy
Vault of Champions
41%inclusion15 decks37 decks
8%synergy
Caves of Koilos
38%inclusion14 decks37 decks
2%synergy
Underground Sea
38%inclusion14 decks37 decks
22%synergy
Isolated Chapel
38%inclusion14 decks37 decks
-3%synergy
City of Brass
38%inclusion14 decks37 decks
23%synergy
Sink into Stupor
35%inclusion13 decks37 decks
22%synergy
Scrubland
35%inclusion13 decks37 decks
19%synergy
Shadowy Backstreet
32%inclusion12 decks37 decks
20%synergy
Drowned Catacomb
32%inclusion12 decks37 decks
-5%synergy
Adarkar Wastes
32%inclusion12 decks37 decks
1%synergy
Meticulous Archive
32%inclusion12 decks37 decks
19%synergy
Mana Confluence
32%inclusion12 decks37 decks
19%synergy
Bloodstained Mire
30%inclusion11 decks37 decks
19%synergy
Verdant Catacombs
27%inclusion10 decks37 decks
17%synergy
Gemstone Caverns
27%inclusion10 decks37 decks
19%synergy
Misty Rainforest
22%inclusion8 decks37 decks
11%synergy
Prairie Stream
22%inclusion8 decks37 decks
-19%synergy
Arcane Sanctum
22%inclusion8 decks37 decks
-33%synergy
Gloomlake Verge
22%inclusion8 decks37 decks
11%synergy
Windswept Heath
19%inclusion7 decks37 decks
9%synergy
Arid Mesa
19%inclusion7 decks37 decks
9%synergy
Floodfarm Verge
19%inclusion7 decks37 decks
8%synergy
Fabled Passage
16%inclusion6 decks37 decks
9%synergy
Valgavoth's Lair
16%inclusion6 decks37 decks
14%synergy
Shipwreck Marsh
16%inclusion6 decks37 decks
-4%synergy
Scalding Tarn
16%inclusion6 decks37 decks
5%synergy
Sunken Hollow
14%inclusion5 decks37 decks
-26%synergy
Snow-Covered Swamp
14%inclusion5 decks37 decks
11%synergy
Witch Enchanter
11%inclusion4 decks37 decks
4%synergy
Fell the Profane
11%inclusion4 decks37 decks
2%synergy
Brightclimb Pathway
11%inclusion4 decks37 decks
4%synergy
Bleachbone Verge
11%inclusion4 decks37 decks
2%synergy