The Master of Keys (Commander) - Optimized Control

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 Lands
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Animate Dead
92%inclusion23 decks25 decks
82%synergy
Ripples of Undeath
84%inclusion21 decks25 decks
81%synergy
Necromancy
80%inclusion20 decks25 decks
75%synergy
Mystic Remora
96%inclusion24 decks25 decks
75%synergy
Entity Tracker
72%inclusion18 decks25 decks
66%synergy
Dress Down
68%inclusion17 decks25 decks
66%synergy
Amphibian Downpour
64%inclusion16 decks25 decks
59%synergy
Abdel Adrian, Gorion's Ward
60%inclusion15 decks25 decks
58%synergy
Sevinne's Reclamation
64%inclusion16 decks25 decks
55%synergy
Entomb
56%inclusion14 decks25 decks
49%synergy
Top Cards
Swords to Plowshares
72%inclusion18 decks25 decks
4%synergy
An Offer You Can't Refuse
60%inclusion15 decks25 decks
33%synergy
Blind Obedience
60%inclusion15 decks25 decks
48%synergy
Inquisitive Glimmer
56%inclusion14 decks25 decks
49%synergy
The Meathook Massacre
48%inclusion12 decks25 decks
45%synergy
Scrabbling Skullcrab
48%inclusion12 decks25 decks
47%synergy
Dark Ritual
48%inclusion12 decks25 decks
29%synergy
Esper Sentinel
48%inclusion12 decks25 decks
20%synergy
Fear of Impostors
48%inclusion12 decks25 decks
47%synergy
Swan Song
48%inclusion12 decks25 decks
28%synergy
Game Changers
Smothering Tithe
80%inclusion20 decks25 decks
49%synergy
Rhystic Study
72%inclusion18 decks25 decks
40%synergy
Enlightened Tutor
64%inclusion16 decks25 decks
44%synergy
Demonic Tutor
52%inclusion13 decks25 decks
31%synergy
Ancient Tomb
48%inclusion12 decks25 decks
35%synergy
Necropotence
44%inclusion11 decks25 decks
37%synergy
Fierce Guardianship
44%inclusion11 decks25 decks
23%synergy
Vampiric Tutor
44%inclusion11 decks25 decks
27%synergy
Thassa's Oracle
36%inclusion9 decks25 decks
27%synergy
Force of Will
36%inclusion9 decks25 decks
23%synergy
Creatures
Ledger Shredder
48%inclusion12 decks25 decks
39%synergy
Lotho, Corrupt Shirriff
44%inclusion11 decks25 decks
27%synergy
Overlord of the Balemurk
44%inclusion11 decks25 decks
42%synergy
Starfield Mystic
36%inclusion9 decks25 decks
29%synergy
Mesa Enchantress
36%inclusion9 decks25 decks
27%synergy
Demon of Fate's Design
36%inclusion9 decks25 decks
31%synergy
Zur, Eternal Schemer
36%inclusion9 decks25 decks
33%synergy
Gravebreaker Lamia
32%inclusion8 decks25 decks
31%synergy
Overlord of the Floodpits
32%inclusion8 decks25 decks
28%synergy
Victor, Valgavoth's Seneschal
32%inclusion8 decks25 decks
30%synergy
Orcish Bowmasters
32%inclusion8 decks25 decks
21%synergy
Displacer Kitten
24%inclusion6 decks25 decks
17%synergy
Valley Floodcaller
24%inclusion6 decks25 decks
20%synergy
Faerie Mastermind
24%inclusion6 decks25 decks
14%synergy
Grand Abolisher
24%inclusion6 decks25 decks
9%synergy
Hullbreaker Horror
24%inclusion6 decks25 decks
18%synergy
Lurrus of the Dream-Den
20%inclusion5 decks25 decks
18%synergy
Fear of Sleep Paralysis
20%inclusion5 decks25 decks
15%synergy
Psychic Frog
20%inclusion5 decks25 decks
13%synergy
Ghostly Pilferer
20%inclusion5 decks25 decks
13%synergy
Opposition Agent
16%inclusion4 decks25 decks
7%synergy
Heliod, Sun-Crowned
16%inclusion4 decks25 decks
12%synergy
Hedron Crab
16%inclusion4 decks25 decks
15%synergy
Leonin Relic-Warder
16%inclusion4 decks25 decks
16%synergy
Enduring Curiosity
16%inclusion4 decks25 decks
8%synergy
Talion, the Kindly Lord
16%inclusion4 decks25 decks
8%synergy
Drannith Magistrate
16%inclusion4 decks25 decks
8%synergy
Doomwake Giant
16%inclusion4 decks25 decks
10%synergy
Heliod, the Radiant Dawn
16%inclusion4 decks25 decks
12%synergy
Aminatou, Veil Piercer
16%inclusion4 decks25 decks
15%synergy
Alseid of Life's Bounty
16%inclusion4 decks25 decks
15%synergy
Witch Enchanter
12%inclusion3 decks25 decks
5%synergy
Hoarding Broodlord
12%inclusion3 decks25 decks
10%synergy
Archon of Sun's Grace
12%inclusion3 decks25 decks
7%synergy
Walking Ballista
12%inclusion3 decks25 decks
10%synergy
Laboratory Maniac
12%inclusion3 decks25 decks
9%synergy
Mockingbird
12%inclusion3 decks25 decks
8%synergy
Grim Guardian
12%inclusion3 decks25 decks
9%synergy
Zur the Enchanter
12%inclusion3 decks25 decks
7%synergy
Silent Hallcreeper
12%inclusion3 decks25 decks
8%synergy
Dauthi Voidwalker
12%inclusion3 decks25 decks
6%synergy
Ondu Spiritdancer
12%inclusion3 decks25 decks
6%synergy
Emet-Selch of the Third Seat
11%inclusion2 decks18 decks
2%synergy
Wan Shi Tong, Librarian
10%inclusion1 decks10 decks
5%synergy
Archivist of Oghma
8.0%inclusion2 decks25 decks
1%synergy
Doom Whisperer
8.0%inclusion2 decks25 decks
7%synergy
Hydroelectric Specimen
8.0%inclusion2 decks25 decks
5%synergy
Sheoldred, the Apocalypse
8.0%inclusion2 decks25 decks
-1%synergy
Stitcher's Supplier
8.0%inclusion2 decks25 decks
7%synergy
Enduring Tenacity
8.0%inclusion2 decks25 decks
0%synergy
Instants
Mana Drain
44%inclusion11 decks25 decks
27%synergy
Dovin's Veto
40%inclusion10 decks25 decks
15%synergy
Cyclonic Rift
36%inclusion9 decks25 decks
12%synergy
Path to Exile
36%inclusion9 decks25 decks
-6%synergy
Frantic Search
28%inclusion7 decks25 decks
10%synergy
Gifts Ungiven
28%inclusion7 decks25 decks
26%synergy
Sink into Stupor
28%inclusion7 decks25 decks
15%synergy
Mystical Tutor
28%inclusion7 decks25 decks
17%synergy
Force of Negation
28%inclusion7 decks25 decks
16%synergy
Muddle the Mixture
20%inclusion5 decks25 decks
16%synergy
Teferi's Protection
20%inclusion5 decks25 decks
3%synergy
Intuition
20%inclusion5 decks25 decks
18%synergy
Cabal Ritual
20%inclusion5 decks25 decks
17%synergy
Silence
20%inclusion5 decks25 decks
10%synergy
Demonic Consultation
20%inclusion5 decks25 decks
12%synergy
Arcane Denial
20%inclusion5 decks25 decks
0%synergy
Fell the Profane
16%inclusion4 decks25 decks
7%synergy
Tainted Pact
16%inclusion4 decks25 decks
9%synergy
Retraction Helix
16%inclusion4 decks25 decks
15%synergy
Brainstorm
16%inclusion4 decks25 decks
-1%synergy
Counterspell
16%inclusion4 decks25 decks
-26%synergy
Borne Upon a Wind
16%inclusion4 decks25 decks
11%synergy
Void Rend
16%inclusion4 decks25 decks
-18%synergy
Deadly Rollick
12%inclusion3 decks25 decks
-3%synergy
Sacrifice
12%inclusion3 decks25 decks
11%synergy
Mental Misstep
12%inclusion3 decks25 decks
5%synergy
Negate
12%inclusion3 decks25 decks
-4%synergy
Culling the Weak
12%inclusion3 decks25 decks
10%synergy
Flusterstorm
12%inclusion3 decks25 decks
4%synergy
Faithful Mending
12%inclusion3 decks25 decks
8%synergy
Waterlogged Teachings
12%inclusion3 decks25 decks
7%synergy
Generous Gift
12%inclusion3 decks25 decks
-3%synergy
Shred Memory
8.0%inclusion2 decks25 decks
8%synergy
Chain of Vapor
8.0%inclusion2 decks25 decks
5%synergy
Lim-Dûl's Vault
8.0%inclusion2 decks25 decks
5%synergy
Razorgrass Ambush
8.0%inclusion2 decks25 decks
7%synergy
Darkblast
8.0%inclusion2 decks25 decks
8%synergy
Angel's Grace
8.0%inclusion2 decks25 decks
5%synergy
Banishing Knack
8.0%inclusion2 decks25 decks
8%synergy
Prismatic Strands
8.0%inclusion2 decks25 decks
8%synergy
Ad Nauseam
8.0%inclusion2 decks25 decks
6%synergy
Delay
8.0%inclusion2 decks25 decks
6%synergy
Saw in Half
8.0%inclusion2 decks25 decks
6%synergy
Into the Flood Maw
8.0%inclusion2 decks25 decks
4%synergy
Mana Leak
8.0%inclusion2 decks25 decks
6%synergy
No More Lies
8.0%inclusion2 decks25 decks
7%synergy
Sorceries
Windfall
44%inclusion11 decks25 decks
30%synergy
Toxic Deluge
40%inclusion10 decks25 decks
20%synergy
Demonic Counsel
24%inclusion6 decks25 decks
23%synergy
Reanimate
24%inclusion6 decks25 decks
8%synergy
Supreme Verdict
16%inclusion4 decks25 decks
1%synergy
Lively Dirge
16%inclusion4 decks25 decks
15%synergy
Buried Alive
16%inclusion4 decks25 decks
12%synergy
Imperial Seal
12%inclusion3 decks25 decks
5%synergy
Yawgmoth's Will
12%inclusion3 decks25 decks
11%synergy
Glimpse the Unthinkable
12%inclusion3 decks25 decks
12%synergy
Damn
12%inclusion3 decks25 decks
-8%synergy
Grim Tutor
12%inclusion3 decks25 decks
8%synergy
Unmarked Grave
8.0%inclusion2 decks25 decks
7%synergy
Peer into the Abyss
8.0%inclusion2 decks25 decks
5%synergy
Idyllic Tutor
8.0%inclusion2 decks25 decks
4%synergy
Rite of Oblivion
8.0%inclusion2 decks25 decks
7%synergy
Final Parting
8.0%inclusion2 decks25 decks
7%synergy
Extinguish All Hope
8.0%inclusion2 decks25 decks
6%synergy
Beseech the Mirror
8.0%inclusion2 decks25 decks
4%synergy
Dance of the Manse
8.0%inclusion2 decks25 decks
5%synergy
Mnemonic Betrayal
8.0%inclusion2 decks25 decks
5%synergy
Space-Time Anomaly
6.7%inclusion1 decks15 decks
5%synergy
Utility Artifacts
Mesmeric Orb
44%inclusion11 decks25 decks
43%synergy
The One Ring
28%inclusion7 decks25 decks
15%synergy
Wishclaw Talisman
28%inclusion7 decks25 decks
20%synergy
Lightning Greaves
12%inclusion3 decks25 decks
-10%synergy
Isochron Scepter
8.0%inclusion2 decks25 decks
6%synergy
Enchantments
Seal of Cleansing
48%inclusion12 decks25 decks
47%synergy
Dance of the Dead
44%inclusion11 decks25 decks
42%synergy
Grasp of Fate
44%inclusion11 decks25 decks
38%synergy
Touch the Spirit Realm
44%inclusion11 decks25 decks
42%synergy
Ghostly Prison
44%inclusion11 decks25 decks
22%synergy
Tinybones Joins Up
36%inclusion9 decks25 decks
35%synergy
Propaganda
36%inclusion9 decks25 decks
8%synergy
Mirrormade
32%inclusion8 decks25 decks
22%synergy
Static Prison
32%inclusion8 decks25 decks
32%synergy
Authority of the Consuls
28%inclusion7 decks25 decks
16%synergy
Sphere of Safety
28%inclusion7 decks25 decks
19%synergy
Secret Arcade // Dusty Parlor
28%inclusion7 decks25 decks
23%synergy
Land Tax
28%inclusion7 decks25 decks
22%synergy
Aura of Silence
28%inclusion7 decks25 decks
25%synergy
Cemetery Tampering
28%inclusion7 decks25 decks
27%synergy
Starfield of Nyx
24%inclusion6 decks25 decks
20%synergy
Out of the Tombs
24%inclusion6 decks25 decks
24%synergy
Greater Auramancy
24%inclusion6 decks25 decks
20%synergy
Sheltered by Ghosts
24%inclusion6 decks25 decks
21%synergy
Seal of Removal
24%inclusion6 decks25 decks
23%synergy
Darksteel Mutation
20%inclusion5 decks25 decks
14%synergy
Chronic Flooding
20%inclusion5 decks25 decks
20%synergy
The Tale of Tamiyo
20%inclusion5 decks25 decks
20%synergy
Black Market Connections
20%inclusion5 decks25 decks
6%synergy
Cacophony Unleashed
16%inclusion4 decks25 decks
14%synergy
Founding the Third Path
16%inclusion4 decks25 decks
16%synergy
Estrid's Invocation
16%inclusion4 decks25 decks
11%synergy
Out of Time
16%inclusion4 decks25 decks
15%synergy
Trouble in Pairs
16%inclusion4 decks25 decks
11%synergy
Standstill
16%inclusion4 decks25 decks
16%synergy
Parallax Wave
12%inclusion3 decks25 decks
12%synergy
Court of Cunning
12%inclusion3 decks25 decks
11%synergy
Attunement
12%inclusion3 decks25 decks
12%synergy
Exquisite Blood
12%inclusion3 decks25 decks
6%synergy
Karmic Justice
12%inclusion3 decks25 decks
10%synergy
All That Glitters
12%inclusion3 decks25 decks
3%synergy
Solitary Confinement
12%inclusion3 decks25 decks
10%synergy
Nowhere to Run
12%inclusion3 decks25 decks
11%synergy
Ethereal Armor
12%inclusion3 decks25 decks
7%synergy
Dog Umbra
12%inclusion3 decks25 decks
12%synergy
Bloodchief Ascension
12%inclusion3 decks25 decks
6%synergy
Stillness in Motion
10%inclusion2 decks21 decks
9%synergy
Stony Silence
8.0%inclusion2 decks25 decks
8%synergy
Sigil of the Empty Throne
8.0%inclusion2 decks25 decks
2%synergy
Verity Circle
8.0%inclusion2 decks25 decks
8%synergy
Unable to Scream
8.0%inclusion2 decks25 decks
7%synergy
Imprisoned in the Moon
8.0%inclusion2 decks25 decks
1%synergy
Dance of Many
8.0%inclusion2 decks25 decks
8%synergy
Glasswing Grace
8.0%inclusion2 decks25 decks
5%synergy
Copy Enchantment
8.0%inclusion2 decks25 decks
3%synergy
Planeswalkers
Teferi, Time Raveler
36%inclusion9 decks25 decks
28%synergy
Tezzeret, Cruel Captain
5.9%inclusion1 decks17 decks
4%synergy
Utility Lands
Hall of Heliod's Generosity
44%inclusion11 decks25 decks
31%synergy
Otawara, Soaring City
44%inclusion11 decks25 decks
25%synergy
Cephalid Coliseum
40%inclusion10 decks25 decks
36%synergy
Takenuma, Abandoned Mire
32%inclusion8 decks25 decks
26%synergy
Bojuka Bog
28%inclusion7 decks25 decks
1%synergy
Urza's Saga
24%inclusion6 decks25 decks
12%synergy
Serra's Sanctum
20%inclusion5 decks25 decks
18%synergy
Urborg, Tomb of Yawgmoth
16%inclusion4 decks25 decks
3%synergy
Volrath's Stronghold
12%inclusion3 decks25 decks
11%synergy
Emergence Zone
12%inclusion3 decks25 decks
10%synergy
Eiganjo, Seat of the Empire
12%inclusion3 decks25 decks
7%synergy
Mana Artifacts
Sol Ring
96%inclusion24 decks25 decks
6%synergy
Arcane Signet
80%inclusion20 decks25 decks
-8%synergy
Talisman of Dominance
80%inclusion20 decks25 decks
30%synergy
Talisman of Progress
76%inclusion19 decks25 decks
32%synergy
Talisman of Hierarchy
76%inclusion19 decks25 decks
32%synergy
Fellwar Stone
48%inclusion12 decks25 decks
14%synergy
Chrome Mox
32%inclusion8 decks25 decks
23%synergy
Mana Vault
28%inclusion7 decks25 decks
19%synergy
Lotus Petal
20%inclusion5 decks25 decks
9%synergy
Dimir Signet
20%inclusion5 decks25 decks
-11%synergy
Azorius Signet
20%inclusion5 decks25 decks
-11%synergy
Mox Opal
20%inclusion5 decks25 decks
11%synergy
Orzhov Signet
16%inclusion4 decks25 decks
-17%synergy
Mox Amber
12%inclusion3 decks25 decks
6%synergy
Hourglass of the Lost
8.0%inclusion2 decks25 decks
8%synergy
Lands
Command Tower
96%inclusion24 decks25 decks
3%synergy
Swamp
96%inclusion24 decks25 decks
5%synergy
Island
96%inclusion24 decks25 decks
3%synergy
Plains
96%inclusion24 decks25 decks
4%synergy
Watery Grave
92%inclusion23 decks25 decks
42%synergy
Godless Shrine
84%inclusion21 decks25 decks
33%synergy
Hallowed Fountain
84%inclusion21 decks25 decks
34%synergy
Polluted Delta
76%inclusion19 decks25 decks
38%synergy
Marsh Flats
72%inclusion18 decks25 decks
36%synergy
Flooded Strand
72%inclusion18 decks25 decks
34%synergy
Exotic Orchard
60%inclusion15 decks25 decks
1%synergy
Sea of Clouds
60%inclusion15 decks25 decks
25%synergy
Adarkar Wastes
60%inclusion15 decks25 decks
29%synergy
Raffine's Tower
56%inclusion14 decks25 decks
15%synergy
Caves of Koilos
56%inclusion14 decks25 decks
20%synergy
Morphic Pool
56%inclusion14 decks25 decks
22%synergy
Underground River
52%inclusion13 decks25 decks
18%synergy
Vault of Champions
52%inclusion13 decks25 decks
19%synergy
Shadowy Backstreet
48%inclusion12 decks25 decks
35%synergy
Undercity Sewers
44%inclusion11 decks25 decks
30%synergy
Meticulous Archive
40%inclusion10 decks25 decks
26%synergy
Windswept Heath
36%inclusion9 decks25 decks
26%synergy
Verdant Catacombs
36%inclusion9 decks25 decks
26%synergy
Bloodstained Mire
36%inclusion9 decks25 decks
25%synergy
Glacial Fortress
32%inclusion8 decks25 decks
-9%synergy
Arid Mesa
32%inclusion8 decks25 decks
22%synergy
Gloomlake Verge
32%inclusion8 decks25 decks
21%synergy
Misty Rainforest
28%inclusion7 decks25 decks
17%synergy
Valgavoth's Lair
28%inclusion7 decks25 decks
25%synergy
Reflecting Pool
28%inclusion7 decks25 decks
20%synergy
Isolated Chapel
28%inclusion7 decks25 decks
-12%synergy
Drowned Catacomb
28%inclusion7 decks25 decks
-9%synergy
Sink into Stupor
28%inclusion7 decks25 decks
15%synergy
City of Brass
28%inclusion7 decks25 decks
13%synergy
Mana Confluence
28%inclusion7 decks25 decks
14%synergy
Tundra
24%inclusion6 decks25 decks
8%synergy
Brightclimb Pathway
24%inclusion6 decks25 decks
17%synergy
Scalding Tarn
24%inclusion6 decks25 decks
13%synergy
Floodfarm Verge
24%inclusion6 decks25 decks
13%synergy
Fabled Passage
20%inclusion5 decks25 decks
13%synergy
Clearwater Pathway
20%inclusion5 decks25 decks
13%synergy
Underground Sea
20%inclusion5 decks25 decks
4%synergy
Scrubland
20%inclusion5 decks25 decks
4%synergy
Arcane Sanctum
20%inclusion5 decks25 decks
-34%synergy
Prismatic Vista
16%inclusion4 decks25 decks
12%synergy
Fell the Profane
16%inclusion4 decks25 decks
7%synergy
Contaminated Landscape
16%inclusion4 decks25 decks
2%synergy
Bleachbone Verge
16%inclusion4 decks25 decks
7%synergy
Prairie Stream
16%inclusion4 decks25 decks
-25%synergy
Skycloud Expanse
16%inclusion4 decks25 decks
1%synergy
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