The Master of Keys (Commander) - Optimized Combo

The Master of Keys
Rank #305
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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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Commander Spellbook
Moxfield
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Game Changers
Creatures
Instants
Sorceries
Utility Artifacts
Enchantments
Planeswalkers
Utility Lands
Mana Artifacts
Lands
Back to Top
Animate Dead
88%inclusion29 decks33 decks
78%synergy
Necromancy
76%inclusion25 decks33 decks
71%synergy
Abdel Adrian, Gorion's Ward
70%inclusion23 decks33 decks
68%synergy
Ripples of Undeath
64%inclusion21 decks33 decks
61%synergy
Mystic Remora
79%inclusion26 decks33 decks
58%synergy
Entomb
64%inclusion21 decks33 decks
57%synergy
Sevinne's Reclamation
64%inclusion21 decks33 decks
55%synergy
Dress Down
48%inclusion16 decks33 decks
46%synergy
Tinybones Joins Up
45%inclusion15 decks33 decks
44%synergy
Dance of the Dead
45%inclusion15 decks33 decks
43%synergy
Top Cards
Swords to Plowshares
64%inclusion21 decks33 decks
-4%synergy
Esper Sentinel
61%inclusion20 decks33 decks
33%synergy
Dark Ritual
58%inclusion19 decks33 decks
38%synergy
Swan Song
55%inclusion18 decks33 decks
35%synergy
An Offer You Can't Refuse
52%inclusion17 decks33 decks
24%synergy
Blind Obedience
52%inclusion17 decks33 decks
39%synergy
The Meathook Massacre
45%inclusion15 decks33 decks
42%synergy
Lotho, Corrupt Shirriff
45%inclusion15 decks33 decks
29%synergy
Windfall
42%inclusion14 decks33 decks
29%synergy
Force of Negation
42%inclusion14 decks33 decks
31%synergy
Game Changers
Rhystic Study
76%inclusion25 decks33 decks
44%synergy
Smothering Tithe
73%inclusion24 decks33 decks
42%synergy
Demonic Tutor
67%inclusion22 decks33 decks
46%synergy
Enlightened Tutor
67%inclusion22 decks33 decks
47%synergy
Vampiric Tutor
67%inclusion22 decks33 decks
50%synergy
Necropotence
55%inclusion18 decks33 decks
48%synergy
Thassa's Oracle
48%inclusion16 decks33 decks
39%synergy
The One Ring
45%inclusion15 decks33 decks
32%synergy
Ancient Tomb
42%inclusion14 decks33 decks
30%synergy
Mystical Tutor
42%inclusion14 decks33 decks
31%synergy
Creatures
Valley Floodcaller
39%inclusion13 decks33 decks
35%synergy
Orcish Bowmasters
39%inclusion13 decks33 decks
29%synergy
Inquisitive Glimmer
36%inclusion12 decks33 decks
29%synergy
Entity Tracker
36%inclusion12 decks33 decks
30%synergy
Grand Abolisher
33%inclusion11 decks33 decks
19%synergy
Mesa Enchantress
30%inclusion10 decks33 decks
21%synergy
Talion, the Kindly Lord
30%inclusion10 decks33 decks
22%synergy
Grim Guardian
30%inclusion10 decks33 decks
28%synergy
Ledger Shredder
30%inclusion10 decks33 decks
22%synergy
Displacer Kitten
27%inclusion9 decks33 decks
20%synergy
Opposition Agent
27%inclusion9 decks33 decks
19%synergy
Gravebreaker Lamia
27%inclusion9 decks33 decks
26%synergy
Demon of Fate's Design
27%inclusion9 decks33 decks
22%synergy
Overlord of the Balemurk
27%inclusion9 decks33 decks
25%synergy
Hullbreaker Horror
27%inclusion9 decks33 decks
21%synergy
Wan Shi Tong, Librarian
25%inclusion3 decks12 decks
20%synergy
Archivist of Oghma
24%inclusion8 decks33 decks
18%synergy
Scrabbling Skullcrab
24%inclusion8 decks33 decks
23%synergy
Overlord of the Floodpits
24%inclusion8 decks33 decks
21%synergy
Fear of Impostors
24%inclusion8 decks33 decks
23%synergy
Mockingbird
24%inclusion8 decks33 decks
20%synergy
Zur, Eternal Schemer
24%inclusion8 decks33 decks
21%synergy
Voice of Victory
23%inclusion7 decks30 decks
15%synergy
Starfield Mystic
21%inclusion7 decks33 decks
15%synergy
Hedron Crab
21%inclusion7 decks33 decks
21%synergy
Leonin Relic-Warder
21%inclusion7 decks33 decks
21%synergy
Laboratory Maniac
21%inclusion7 decks33 decks
18%synergy
Snapcaster Mage
18%inclusion6 decks33 decks
16%synergy
Lurrus of the Dream-Den
18%inclusion6 decks33 decks
17%synergy
Victor, Valgavoth's Seneschal
18%inclusion6 decks33 decks
16%synergy
Ranger-Captain of Eos
18%inclusion6 decks33 decks
12%synergy
Ondu Spiritdancer
18%inclusion6 decks33 decks
12%synergy
Psychic Frog
18%inclusion6 decks33 decks
11%synergy
Phyrexian Metamorph
15%inclusion5 decks33 decks
7%synergy
Moon-Blessed Cleric
15%inclusion5 decks33 decks
10%synergy
Enduring Curiosity
15%inclusion5 decks33 decks
7%synergy
Fear of Sleep Paralysis
15%inclusion5 decks33 decks
10%synergy
Faerie Mastermind
15%inclusion5 decks33 decks
6%synergy
Drannith Magistrate
15%inclusion5 decks33 decks
7%synergy
Ghostly Pilferer
15%inclusion5 decks33 decks
8%synergy
Witch Enchanter
12%inclusion4 decks33 decks
5%synergy
Hoarding Broodlord
12%inclusion4 decks33 decks
10%synergy
Walking Ballista
12%inclusion4 decks33 decks
10%synergy
Heliod, Sun-Crowned
12%inclusion4 decks33 decks
8%synergy
Gremlin Tamer
12%inclusion4 decks33 decks
11%synergy
Doomwake Giant
12%inclusion4 decks33 decks
6%synergy
Heliod, the Radiant Dawn
12%inclusion4 decks33 decks
8%synergy
Ghostly Dancers
12%inclusion4 decks33 decks
10%synergy
Sheoldred, the Apocalypse
9.1%inclusion3 decks33 decks
0%synergy
Archon of Sun's Grace
9.1%inclusion3 decks33 decks
5%synergy
Instants
Silence
39%inclusion13 decks33 decks
29%synergy
Force of Will
39%inclusion13 decks33 decks
27%synergy
Counterspell
39%inclusion13 decks33 decks
-2%synergy
Path to Exile
39%inclusion13 decks33 decks
-3%synergy
Cyclonic Rift
36%inclusion12 decks33 decks
13%synergy
Gifts Ungiven
33%inclusion11 decks33 decks
31%synergy
Flusterstorm
33%inclusion11 decks33 decks
25%synergy
Cabal Ritual
30%inclusion10 decks33 decks
27%synergy
Mana Drain
30%inclusion10 decks33 decks
13%synergy
Demonic Consultation
30%inclusion10 decks33 decks
22%synergy
Sink into Stupor
30%inclusion10 decks33 decks
18%synergy
Fierce Guardianship
30%inclusion10 decks33 decks
10%synergy
Borne Upon a Wind
24%inclusion8 decks33 decks
19%synergy
Teferi's Protection
21%inclusion7 decks33 decks
5%synergy
Mental Misstep
21%inclusion7 decks33 decks
15%synergy
Dovin's Veto
21%inclusion7 decks33 decks
-4%synergy
Into the Flood Maw
21%inclusion7 decks33 decks
17%synergy
Arcane Denial
21%inclusion7 decks33 decks
1%synergy
Muddle the Mixture
18%inclusion6 decks33 decks
14%synergy
Tainted Pact
18%inclusion6 decks33 decks
11%synergy
Retraction Helix
18%inclusion6 decks33 decks
17%synergy
Brainstorm
18%inclusion6 decks33 decks
1%synergy
Intuition
18%inclusion6 decks33 decks
17%synergy
Mindbreak Trap
18%inclusion6 decks33 decks
11%synergy
Pact of Negation
18%inclusion6 decks33 decks
11%synergy
Deadly Rollick
15%inclusion5 decks33 decks
0%synergy
Void Rend
15%inclusion5 decks33 decks
-19%synergy
Sacrifice
12%inclusion4 decks33 decks
11%synergy
Frantic Search
12%inclusion4 decks33 decks
-6%synergy
Brain Freeze
12%inclusion4 decks33 decks
12%synergy
Culling the Weak
12%inclusion4 decks33 decks
11%synergy
Strix Serenade
12%inclusion4 decks33 decks
9%synergy
Ad Nauseam
12%inclusion4 decks33 decks
10%synergy
Waterlogged Teachings
12%inclusion4 decks33 decks
8%synergy
Fell the Profane
9.1%inclusion3 decks33 decks
0%synergy
Chain of Vapor
9.1%inclusion3 decks33 decks
6%synergy
Negate
9.1%inclusion3 decks33 decks
-7%synergy
Dawn's Truce
9.1%inclusion3 decks33 decks
5%synergy
Dispel
9.1%inclusion3 decks33 decks
6%synergy
Banishing Knack
9.1%inclusion3 decks33 decks
9%synergy
Opt
9.1%inclusion3 decks33 decks
5%synergy
Saw in Half
9.1%inclusion3 decks33 decks
7%synergy
Drown in the Loch
6.1%inclusion2 decks33 decks
4%synergy
Orim's Chant
6.1%inclusion2 decks33 decks
5%synergy
Clutch of the Undercity
6.1%inclusion2 decks33 decks
6%synergy
Angel's Grace
6.1%inclusion2 decks33 decks
3%synergy
Perplex
6.1%inclusion2 decks33 decks
5%synergy
Permission Denied
6.1%inclusion2 decks33 decks
4%synergy
Snap
6.1%inclusion2 decks33 decks
4%synergy
Anguished Unmaking
6.1%inclusion2 decks33 decks
-19%synergy
Sorceries
Toxic Deluge
39%inclusion13 decks33 decks
20%synergy
Reanimate
36%inclusion12 decks33 decks
20%synergy
Lively Dirge
18%inclusion6 decks33 decks
17%synergy
Imperial Seal
18%inclusion6 decks33 decks
11%synergy
Unmarked Grave
15%inclusion5 decks33 decks
14%synergy
Damn
15%inclusion5 decks33 decks
-5%synergy
Idyllic Tutor
12%inclusion4 decks33 decks
8%synergy
Demonic Counsel
12%inclusion4 decks33 decks
11%synergy
Singularity Rupture
10%inclusion2 decks21 decks
7%synergy
Gitaxian Probe
9.1%inclusion3 decks33 decks
7%synergy
Yawgmoth's Will
9.1%inclusion3 decks33 decks
8%synergy
Dread Return
9.1%inclusion3 decks33 decks
6%synergy
Farewell
9.1%inclusion3 decks33 decks
-4%synergy
Beseech the Mirror
9.1%inclusion3 decks33 decks
5%synergy
Traumatize
9.1%inclusion3 decks33 decks
9%synergy
Cabal Therapy
6.1%inclusion2 decks33 decks
6%synergy
Supreme Verdict
6.1%inclusion2 decks33 decks
-9%synergy
Diabolic Intent
6.1%inclusion2 decks33 decks
1%synergy
Resurgent Belief
6.1%inclusion2 decks33 decks
4%synergy
Diabolic Tutor
6.1%inclusion2 decks33 decks
1%synergy
Torment of Hailfire
6.1%inclusion2 decks33 decks
5%synergy
Wrath of God
6.1%inclusion2 decks33 decks
2%synergy
Unearth
6.1%inclusion2 decks33 decks
4%synergy
Cut Your Losses
6.1%inclusion2 decks33 decks
6%synergy
Feed the Swarm
6.1%inclusion2 decks33 decks
3%synergy
Buried Alive
6.1%inclusion2 decks33 decks
2%synergy
Vanquish the Horde
6.1%inclusion2 decks33 decks
3%synergy
Mnemonic Betrayal
6.1%inclusion2 decks33 decks
3%synergy
Unburial Rites
6.1%inclusion2 decks33 decks
3%synergy
Damnation
6.1%inclusion2 decks33 decks
3%synergy
Grim Tutor
6.1%inclusion2 decks33 decks
2%synergy
Redress Fate
6.1%inclusion2 decks33 decks
0%synergy
Dance of the Manse
6.1%inclusion2 decks33 decks
3%synergy
Utility Artifacts
Wishclaw Talisman
36%inclusion12 decks33 decks
28%synergy
Mesmeric Orb
24%inclusion8 decks33 decks
23%synergy
Sensei's Divining Top
21%inclusion7 decks33 decks
12%synergy
Bolas's Citadel
9.1%inclusion3 decks33 decks
0%synergy
Altar of the Brood
9.1%inclusion3 decks33 decks
8%synergy
Lightning Greaves
9.1%inclusion3 decks33 decks
-13%synergy
Isochron Scepter
9.1%inclusion3 decks33 decks
7%synergy
Crucible of Worlds
6.1%inclusion2 decks33 decks
5%synergy
Mirror of Fate
6.1%inclusion2 decks33 decks
6%synergy
Mirage Mirror
6.1%inclusion2 decks33 decks
5%synergy
Expedition Map
6.1%inclusion2 decks33 decks
5%synergy
Agatha's Soul Cauldron
6.1%inclusion2 decks33 decks
6%synergy
Enchantments
Mirrormade
39%inclusion13 decks33 decks
30%synergy
Amphibian Downpour
36%inclusion12 decks33 decks
32%synergy
Touch the Spirit Realm
30%inclusion10 decks33 decks
28%synergy
Seal of Cleansing
30%inclusion10 decks33 decks
29%synergy
Propaganda
30%inclusion10 decks33 decks
3%synergy
Ghostly Prison
27%inclusion9 decks33 decks
5%synergy
Court of Cunning
24%inclusion8 decks33 decks
23%synergy
Static Prison
24%inclusion8 decks33 decks
24%synergy
Enchanted Evening
24%inclusion8 decks33 decks
23%synergy
Trouble in Pairs
24%inclusion8 decks33 decks
19%synergy
Grasp of Fate
21%inclusion7 decks33 decks
15%synergy
Out of the Tombs
21%inclusion7 decks33 decks
21%synergy
Sphere of Safety
21%inclusion7 decks33 decks
12%synergy
Secret Arcade // Dusty Parlor
21%inclusion7 decks33 decks
16%synergy
Stillness in Motion
20%inclusion6 decks30 decks
20%synergy
Estrid's Invocation
15%inclusion5 decks33 decks
11%synergy
Starfield of Nyx
15%inclusion5 decks33 decks
11%synergy
Teval's Judgment
13%inclusion4 decks30 decks
13%synergy
Cemetery Tampering
12%inclusion4 decks33 decks
11%synergy
Leyline of Anticipation
12%inclusion4 decks33 decks
8%synergy
All That Glitters
12%inclusion4 decks33 decks
3%synergy
Black Market Connections
12%inclusion4 decks33 decks
-2%synergy
Bloodchief Ascension
12%inclusion4 decks33 decks
7%synergy
Dollmaker's Shop // Porcelain Gallery
12%inclusion4 decks33 decks
11%synergy
Greater Auramancy
12%inclusion4 decks33 decks
8%synergy
Counterbalance
9.1%inclusion3 decks33 decks
7%synergy
Founding the Third Path
9.1%inclusion3 decks33 decks
9%synergy
Cacophony Unleashed
9.1%inclusion3 decks33 decks
7%synergy
Sigil of the Empty Throne
9.1%inclusion3 decks33 decks
3%synergy
Authority of the Consuls
9.1%inclusion3 decks33 decks
-3%synergy
Copy Artifact
9.1%inclusion3 decks33 decks
8%synergy
Monologue Tax
9.1%inclusion3 decks33 decks
3%synergy
Chthonian Nightmare
9.1%inclusion3 decks33 decks
9%synergy
Land Tax
9.1%inclusion3 decks33 decks
3%synergy
Nowhere to Run
9.1%inclusion3 decks33 decks
8%synergy
Hallowed Haunting
9.1%inclusion3 decks33 decks
7%synergy
Mirror Room // Fractured Realm
9.1%inclusion3 decks33 decks
7%synergy
Aura of Silence
9.1%inclusion3 decks33 decks
6%synergy
Seal of Removal
9.1%inclusion3 decks33 decks
9%synergy
Endless Evil
6.1%inclusion2 decks33 decks
6%synergy
Parallax Wave
6.1%inclusion2 decks33 decks
6%synergy
Imprisoned in the Moon
6.1%inclusion2 decks33 decks
-1%synergy
Extravagant Replication
6.1%inclusion2 decks33 decks
1%synergy
Opalescence
6.1%inclusion2 decks33 decks
6%synergy
Hopeless Nightmare
6.1%inclusion2 decks33 decks
6%synergy
Followed Footsteps
6.1%inclusion2 decks33 decks
5%synergy
Copy Enchantment
6.1%inclusion2 decks33 decks
1%synergy
Shark Typhoon
6.1%inclusion2 decks33 decks
0%synergy
Timely Ward
6.1%inclusion2 decks33 decks
1%synergy
Exquisite Blood
6.1%inclusion2 decks33 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
30%inclusion10 decks33 decks
22%synergy
Jace, Wielder of Mysteries
6.1%inclusion2 decks33 decks
4%synergy
Narset, Parter of Veils
6.1%inclusion2 decks33 decks
2%synergy
Utility Lands
Hall of Heliod's Generosity
39%inclusion13 decks33 decks
26%synergy
Otawara, Soaring City
39%inclusion13 decks33 decks
20%synergy
Urza's Saga
33%inclusion11 decks33 decks
22%synergy
Emergence Zone
24%inclusion8 decks33 decks
22%synergy
Cephalid Coliseum
21%inclusion7 decks33 decks
18%synergy
Urborg, Tomb of Yawgmoth
21%inclusion7 decks33 decks
8%synergy
Bojuka Bog
15%inclusion5 decks33 decks
-12%synergy
Serra's Sanctum
15%inclusion5 decks33 decks
13%synergy
Takenuma, Abandoned Mire
15%inclusion5 decks33 decks
9%synergy
Minamo, School at Water's Edge
9.1%inclusion3 decks33 decks
5%synergy
Reliquary Tower
9.1%inclusion3 decks33 decks
-25%synergy
Mistrise Village
6.7%inclusion2 decks30 decks
3%synergy
Shizo, Death's Storehouse
6.1%inclusion2 decks33 decks
4%synergy
Eiganjo, Seat of the Empire
6.1%inclusion2 decks33 decks
1%synergy
Mana Artifacts
Sol Ring
100%inclusion33 decks33 decks
10%synergy
Arcane Signet
94%inclusion31 decks33 decks
6%synergy
Talisman of Dominance
85%inclusion28 decks33 decks
35%synergy
Talisman of Progress
64%inclusion21 decks33 decks
20%synergy
Talisman of Hierarchy
58%inclusion19 decks33 decks
14%synergy
Fellwar Stone
48%inclusion16 decks33 decks
15%synergy
Mana Vault
36%inclusion12 decks33 decks
27%synergy
Chrome Mox
36%inclusion12 decks33 decks
27%synergy
Lotus Petal
30%inclusion10 decks33 decks
20%synergy
Mox Opal
27%inclusion9 decks33 decks
19%synergy
Mox Amber
21%inclusion7 decks33 decks
15%synergy
Mox Diamond
21%inclusion7 decks33 decks
14%synergy
Azorius Signet
18%inclusion6 decks33 decks
-13%synergy
Dimir Signet
15%inclusion5 decks33 decks
-16%synergy
Orzhov Signet
15%inclusion5 decks33 decks
-18%synergy
Lion's Eye Diamond
12%inclusion4 decks33 decks
10%synergy
Mind Stone
9.1%inclusion3 decks33 decks
-3%synergy
Commander's Sphere
6.1%inclusion2 decks33 decks
-12%synergy
Grim Monolith
6.1%inclusion2 decks33 decks
3%synergy
Basalt Monolith
6.1%inclusion2 decks33 decks
4%synergy
Lands
Command Tower
94%inclusion31 decks33 decks
1%synergy
Island
85%inclusion28 decks33 decks
-8%synergy
Swamp
82%inclusion27 decks33 decks
-10%synergy
Plains
82%inclusion27 decks33 decks
-10%synergy
Watery Grave
82%inclusion27 decks33 decks
31%synergy
Flooded Strand
79%inclusion26 decks33 decks
41%synergy
Godless Shrine
73%inclusion24 decks33 decks
22%synergy
Marsh Flats
73%inclusion24 decks33 decks
37%synergy
Polluted Delta
73%inclusion24 decks33 decks
35%synergy
Hallowed Fountain
73%inclusion24 decks33 decks
23%synergy
Exotic Orchard
67%inclusion22 decks33 decks
8%synergy
Sea of Clouds
52%inclusion17 decks33 decks
16%synergy
Morphic Pool
45%inclusion15 decks33 decks
11%synergy
Tundra
42%inclusion14 decks33 decks
27%synergy
Glacial Fortress
42%inclusion14 decks33 decks
1%synergy
Raffine's Tower
42%inclusion14 decks33 decks
2%synergy
Underground River
42%inclusion14 decks33 decks
9%synergy
Undercity Sewers
39%inclusion13 decks33 decks
25%synergy
Caves of Koilos
39%inclusion13 decks33 decks
4%synergy
Underground Sea
39%inclusion13 decks33 decks
24%synergy
Isolated Chapel
39%inclusion13 decks33 decks
-1%synergy
Vault of Champions
39%inclusion13 decks33 decks
7%synergy
Scrubland
36%inclusion12 decks33 decks
20%synergy
City of Brass
36%inclusion12 decks33 decks
21%synergy
Drowned Catacomb
33%inclusion11 decks33 decks
-4%synergy
Meticulous Archive
33%inclusion11 decks33 decks
19%synergy
Adarkar Wastes
33%inclusion11 decks33 decks
2%synergy
Shadowy Backstreet
30%inclusion10 decks33 decks
18%synergy
Sink into Stupor
30%inclusion10 decks33 decks
18%synergy
Mana Confluence
30%inclusion10 decks33 decks
17%synergy
Bloodstained Mire
30%inclusion10 decks33 decks
19%synergy
Verdant Catacombs
27%inclusion9 decks33 decks
17%synergy
Gemstone Caverns
27%inclusion9 decks33 decks
20%synergy
Arcane Sanctum
24%inclusion8 decks33 decks
-30%synergy
Misty Rainforest
21%inclusion7 decks33 decks
10%synergy
Prairie Stream
21%inclusion7 decks33 decks
-19%synergy
Gloomlake Verge
21%inclusion7 decks33 decks
10%synergy
Fabled Passage
18%inclusion6 decks33 decks
11%synergy
Windswept Heath
18%inclusion6 decks33 decks
9%synergy
Arid Mesa
18%inclusion6 decks33 decks
9%synergy
Floodfarm Verge
18%inclusion6 decks33 decks
7%synergy
Shipwreck Marsh
15%inclusion5 decks33 decks
-5%synergy
Valgavoth's Lair
15%inclusion5 decks33 decks
12%synergy
Scalding Tarn
15%inclusion5 decks33 decks
4%synergy
Witch Enchanter
12%inclusion4 decks33 decks
5%synergy
Brightclimb Pathway
12%inclusion4 decks33 decks
5%synergy
Bleachbone Verge
12%inclusion4 decks33 decks
4%synergy
Temple of Deceit
12%inclusion4 decks33 decks
-5%synergy
Temple of Enlightenment
12%inclusion4 decks33 decks
-4%synergy
Sunken Hollow
12%inclusion4 decks33 decks
-28%synergy
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