The Master of Keys (Commander) - Optimized Mill

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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Enchantments
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Utility Lands
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Animate Dead
76%inclusion19 decks25 decks
66%synergy
Necromancy
68%inclusion17 decks25 decks
63%synergy
Mystic Remora
84%inclusion21 decks25 decks
63%synergy
Dress Down
64%inclusion16 decks25 decks
62%synergy
Ripples of Undeath
64%inclusion16 decks25 decks
61%synergy
Entity Tracker
64%inclusion16 decks25 decks
58%synergy
Inquisitive Glimmer
64%inclusion16 decks25 decks
57%synergy
Sevinne's Reclamation
64%inclusion16 decks25 decks
55%synergy
Dance of the Dead
56%inclusion14 decks25 decks
54%synergy
Mesmeric Orb
52%inclusion13 decks25 decks
51%synergy
Top Cards
Swords to Plowshares
56%inclusion14 decks25 decks
-12%synergy
Entomb
52%inclusion13 decks25 decks
45%synergy
Blind Obedience
48%inclusion12 decks25 decks
36%synergy
Abdel Adrian, Gorion's Ward
48%inclusion12 decks25 decks
46%synergy
Amphibian Downpour
44%inclusion11 decks25 decks
39%synergy
An Offer You Can't Refuse
40%inclusion10 decks25 decks
13%synergy
Dark Ritual
40%inclusion10 decks25 decks
20%synergy
Overlord of the Balemurk
40%inclusion10 decks25 decks
38%synergy
Mesa Enchantress
40%inclusion10 decks25 decks
31%synergy
Secret Arcade // Dusty Parlor
40%inclusion10 decks25 decks
35%synergy
Game Changers
Smothering Tithe
72%inclusion18 decks25 decks
41%synergy
Rhystic Study
72%inclusion18 decks25 decks
41%synergy
Enlightened Tutor
60%inclusion15 decks25 decks
41%synergy
Demonic Tutor
44%inclusion11 decks25 decks
23%synergy
Thassa's Oracle
36%inclusion9 decks25 decks
27%synergy
Necropotence
32%inclusion8 decks25 decks
25%synergy
Cyclonic Rift
32%inclusion8 decks25 decks
9%synergy
Vampiric Tutor
32%inclusion8 decks25 decks
15%synergy
Force of Will
28%inclusion7 decks25 decks
16%synergy
Fierce Guardianship
28%inclusion7 decks25 decks
8%synergy
Creatures
Lotho, Corrupt Shirriff
36%inclusion9 decks25 decks
19%synergy
Scrabbling Skullcrab
36%inclusion9 decks25 decks
35%synergy
Starfield Mystic
36%inclusion9 decks25 decks
29%synergy
Overlord of the Floodpits
36%inclusion9 decks25 decks
32%synergy
Demon of Fate's Design
36%inclusion9 decks25 decks
31%synergy
Esper Sentinel
36%inclusion9 decks25 decks
9%synergy
Gravebreaker Lamia
32%inclusion8 decks25 decks
31%synergy
Fear of Impostors
32%inclusion8 decks25 decks
31%synergy
Displacer Kitten
28%inclusion7 decks25 decks
21%synergy
Hedron Crab
28%inclusion7 decks25 decks
27%synergy
Fear of Sleep Paralysis
28%inclusion7 decks25 decks
23%synergy
Grand Abolisher
28%inclusion7 decks25 decks
14%synergy
Zur, Eternal Schemer
28%inclusion7 decks25 decks
25%synergy
Orcish Bowmasters
28%inclusion7 decks25 decks
18%synergy
Wan Shi Tong, Librarian
25%inclusion3 decks12 decks
20%synergy
Enduring Curiosity
24%inclusion6 decks25 decks
16%synergy
Doomwake Giant
24%inclusion6 decks25 decks
18%synergy
Hullbreaker Horror
24%inclusion6 decks25 decks
18%synergy
Ledger Shredder
24%inclusion6 decks25 decks
15%synergy
Lurrus of the Dream-Den
20%inclusion5 decks25 decks
18%synergy
Grim Guardian
20%inclusion5 decks25 decks
18%synergy
Heliod, the Radiant Dawn
20%inclusion5 decks25 decks
16%synergy
Ghostly Dancers
20%inclusion5 decks25 decks
18%synergy
Zur the Enchanter
20%inclusion5 decks25 decks
15%synergy
Opposition Agent
16%inclusion4 decks25 decks
8%synergy
Grand Arbiter Augustin IV
16%inclusion4 decks25 decks
10%synergy
Valley Floodcaller
16%inclusion4 decks25 decks
12%synergy
Soaring Lightbringer
16%inclusion4 decks25 decks
11%synergy
Victor, Valgavoth's Seneschal
16%inclusion4 decks25 decks
14%synergy
Mockingbird
16%inclusion4 decks25 decks
12%synergy
Ondu Spiritdancer
16%inclusion4 decks25 decks
10%synergy
Psychic Frog
16%inclusion4 decks25 decks
9%synergy
Moonshadow
14%inclusion1 decks7 decks
14%synergy
Bruvac the Grandiloquent
12%inclusion3 decks25 decks
11%synergy
Sage of Mysteries
12%inclusion3 decks25 decks
12%synergy
Silent Hallcreeper
12%inclusion3 decks25 decks
7%synergy
Moon-Blessed Cleric
12%inclusion3 decks25 decks
7%synergy
Enduring Tenacity
12%inclusion3 decks25 decks
4%synergy
Talion, the Kindly Lord
12%inclusion3 decks25 decks
4%synergy
Gremlin Tamer
12%inclusion3 decks25 decks
11%synergy
Laboratory Maniac
12%inclusion3 decks25 decks
9%synergy
Ranger-Captain of Eos
12%inclusion3 decks25 decks
6%synergy
Alseid of Life's Bounty
12%inclusion3 decks25 decks
11%synergy
Ketramose, the New Dawn
12%inclusion3 decks25 decks
12%synergy
Dauthi Voidwalker
12%inclusion3 decks25 decks
6%synergy
Ghostly Pilferer
12%inclusion3 decks25 decks
5%synergy
Emet-Selch of the Third Seat
11%inclusion2 decks19 decks
1%synergy
Dutiful Knowledge Seeker
8.3%inclusion1 decks12 decks
8%synergy
Koh, the Face Stealer
8.3%inclusion1 decks12 decks
8%synergy
Archivist of Oghma
8.0%inclusion2 decks25 decks
1%synergy
Instants
Dovin's Veto
36%inclusion9 decks25 decks
10%synergy
Swan Song
36%inclusion9 decks25 decks
16%synergy
Mana Drain
32%inclusion8 decks25 decks
15%synergy
Silence
32%inclusion8 decks25 decks
22%synergy
Path to Exile
28%inclusion7 decks25 decks
-14%synergy
Mystical Tutor
28%inclusion7 decks25 decks
17%synergy
Void Rend
24%inclusion6 decks25 decks
-10%synergy
Frantic Search
20%inclusion5 decks25 decks
2%synergy
Arcane Denial
20%inclusion5 decks25 decks
0%synergy
Counterspell
20%inclusion5 decks25 decks
-22%synergy
Teferi's Protection
16%inclusion4 decks25 decks
0%synergy
Brainstorm
16%inclusion4 decks25 decks
-1%synergy
Intuition
16%inclusion4 decks25 decks
14%synergy
Gifts Ungiven
16%inclusion4 decks25 decks
14%synergy
Demonic Consultation
16%inclusion4 decks25 decks
8%synergy
Force of Negation
16%inclusion4 decks25 decks
4%synergy
Borne Upon a Wind
16%inclusion4 decks25 decks
11%synergy
Drown in the Loch
12%inclusion3 decks25 decks
10%synergy
Mental Misstep
12%inclusion3 decks25 decks
5%synergy
Brain Freeze
12%inclusion3 decks25 decks
11%synergy
Cabal Ritual
12%inclusion3 decks25 decks
9%synergy
Strix Serenade
12%inclusion3 decks25 decks
8%synergy
Flusterstorm
12%inclusion3 decks25 decks
4%synergy
Sink into Stupor
12%inclusion3 decks25 decks
-1%synergy
Pongify
8.0%inclusion2 decks25 decks
6%synergy
Tainted Pact
8.0%inclusion2 decks25 decks
1%synergy
Orim's Chant
8.0%inclusion2 decks25 decks
6%synergy
Retraction Helix
8.0%inclusion2 decks25 decks
7%synergy
Negate
8.0%inclusion2 decks25 decks
-8%synergy
Mindbreak Trap
8.0%inclusion2 decks25 decks
1%synergy
Into the Flood Maw
8.0%inclusion2 decks25 decks
4%synergy
Prismatic Strands
8.0%inclusion2 decks25 decks
8%synergy
Ad Nauseam
8.0%inclusion2 decks25 decks
6%synergy
Anguished Unmaking
8.0%inclusion2 decks25 decks
-17%synergy
Otherworldly Gaze
8.0%inclusion2 decks25 decks
6%synergy
Pact of Negation
8.0%inclusion2 decks25 decks
0%synergy
Sorceries
Windfall
28%inclusion7 decks25 decks
15%synergy
Reanimate
28%inclusion7 decks25 decks
12%synergy
Maddening Cacophony
20%inclusion5 decks25 decks
19%synergy
Lively Dirge
16%inclusion4 decks25 decks
15%synergy
Glimpse the Unthinkable
16%inclusion4 decks25 decks
16%synergy
Demonic Counsel
16%inclusion4 decks25 decks
15%synergy
Toxic Deluge
16%inclusion4 decks25 decks
-4%synergy
Winnowing
14%inclusion1 decks7 decks
13%synergy
Farewell
12%inclusion3 decks25 decks
-1%synergy
Damn
12%inclusion3 decks25 decks
-8%synergy
Extinguish All Hope
12%inclusion3 decks25 decks
10%synergy
Dance of the Manse
12%inclusion3 decks25 decks
9%synergy
Resurgent Belief
8.0%inclusion2 decks25 decks
6%synergy
Imperial Seal
8.0%inclusion2 decks25 decks
1%synergy
Replenish
8.0%inclusion2 decks25 decks
6%synergy
Idyllic Tutor
8.0%inclusion2 decks25 decks
4%synergy
Buried Alive
8.0%inclusion2 decks25 decks
4%synergy
Mind Grind
8.0%inclusion2 decks25 decks
8%synergy
Rite of Oblivion
8.0%inclusion2 decks25 decks
7%synergy
Fractured Sanity
8.0%inclusion2 decks25 decks
7%synergy
Traumatize
8.0%inclusion2 decks25 decks
8%synergy
Grim Tutor
8.0%inclusion2 decks25 decks
4%synergy
Singularity Rupture
5.9%inclusion1 decks17 decks
4%synergy
Space-Time Anomaly
5.9%inclusion1 decks17 decks
4%synergy
Ultima
5.6%inclusion1 decks18 decks
5%synergy
Utility Artifacts
The One Ring
24%inclusion6 decks25 decks
11%synergy
Wishclaw Talisman
16%inclusion4 decks25 decks
8%synergy
Lightning Greaves
16%inclusion4 decks25 decks
-7%synergy
Sensei's Divining Top
12%inclusion3 decks25 decks
2%synergy
Altar of the Brood
12%inclusion3 decks25 decks
11%synergy
Mindcrank
8.0%inclusion2 decks25 decks
6%synergy
Isochron Scepter
8.0%inclusion2 decks25 decks
6%synergy
The Water Crystal
5.6%inclusion1 decks18 decks
4%synergy
The Darkness Crystal
5.3%inclusion1 decks19 decks
3%synergy
Enchantments
Ghostly Prison
40%inclusion10 decks25 decks
18%synergy
The Meathook Massacre
36%inclusion9 decks25 decks
33%synergy
Tinybones Joins Up
36%inclusion9 decks25 decks
35%synergy
Mirrormade
36%inclusion9 decks25 decks
26%synergy
Propaganda
36%inclusion9 decks25 decks
8%synergy
Sphere of Safety
32%inclusion8 decks25 decks
23%synergy
Grasp of Fate
28%inclusion7 decks25 decks
22%synergy
Seal of Cleansing
28%inclusion7 decks25 decks
27%synergy
Cacophony Unleashed
24%inclusion6 decks25 decks
22%synergy
Cemetery Tampering
24%inclusion6 decks25 decks
23%synergy
Land Tax
24%inclusion6 decks25 decks
18%synergy
Solitary Confinement
24%inclusion6 decks25 decks
22%synergy
Out of the Tombs
20%inclusion5 decks25 decks
20%synergy
Touch the Spirit Realm
20%inclusion5 decks25 decks
18%synergy
Estrid's Invocation
20%inclusion5 decks25 decks
15%synergy
Copy Enchantment
20%inclusion5 decks25 decks
15%synergy
Starfield of Nyx
20%inclusion5 decks25 decks
16%synergy
The Tale of Tamiyo
20%inclusion5 decks25 decks
20%synergy
Static Prison
20%inclusion5 decks25 decks
20%synergy
Black Market Connections
20%inclusion5 decks25 decks
5%synergy
Nowhere to Run
20%inclusion5 decks25 decks
19%synergy
Counterbalance
16%inclusion4 decks25 decks
14%synergy
Authority of the Consuls
16%inclusion4 decks25 decks
4%synergy
Exquisite Blood
16%inclusion4 decks25 decks
10%synergy
Leyline of Anticipation
16%inclusion4 decks25 decks
12%synergy
Sheltered by Ghosts
16%inclusion4 decks25 decks
13%synergy
Ethereal Armor
16%inclusion4 decks25 decks
11%synergy
Greater Auramancy
16%inclusion4 decks25 decks
12%synergy
Mornsong Aria
14%inclusion1 decks7 decks
14%synergy
Darksteel Mutation
12%inclusion3 decks25 decks
6%synergy
Psychic Corrosion
12%inclusion3 decks25 decks
11%synergy
Imprisoned in the Moon
12%inclusion3 decks25 decks
5%synergy
Chronic Flooding
12%inclusion3 decks25 decks
12%synergy
Steal Enchantment
12%inclusion3 decks25 decks
11%synergy
Attunement
12%inclusion3 decks25 decks
12%synergy
Monologue Tax
12%inclusion3 decks25 decks
6%synergy
Enchanted Evening
12%inclusion3 decks25 decks
10%synergy
Oubliette
12%inclusion3 decks25 decks
10%synergy
Copy Land
12%inclusion3 decks25 decks
11%synergy
Polluted Cistern // Dim Oubliette
12%inclusion3 decks25 decks
11%synergy
Mirror Room // Fractured Realm
12%inclusion3 decks25 decks
10%synergy
Trouble in Pairs
12%inclusion3 decks25 decks
7%synergy
Memory Erosion
12%inclusion3 decks25 decks
11%synergy
Stillness in Motion
8.7%inclusion2 decks23 decks
8%synergy
Endless Evil
8.0%inclusion2 decks25 decks
8%synergy
Stony Silence
8.0%inclusion2 decks25 decks
8%synergy
Court of Cunning
8.0%inclusion2 decks25 decks
7%synergy
Lunar Force
8.0%inclusion2 decks25 decks
8%synergy
Rule of Law
8.0%inclusion2 decks25 decks
6%synergy
Copy Artifact
8.0%inclusion2 decks25 decks
7%synergy
Planeswalkers
Teferi, Time Raveler
24%inclusion6 decks25 decks
16%synergy
Ashiok, Dream Render
8.0%inclusion2 decks25 decks
6%synergy
Utility Lands
Bojuka Bog
44%inclusion11 decks25 decks
17%synergy
Otawara, Soaring City
44%inclusion11 decks25 decks
25%synergy
Hall of Heliod's Generosity
36%inclusion9 decks25 decks
23%synergy
Ancient Tomb
24%inclusion6 decks25 decks
11%synergy
Cephalid Coliseum
24%inclusion6 decks25 decks
20%synergy
Serra's Sanctum
20%inclusion5 decks25 decks
18%synergy
Takenuma, Abandoned Mire
20%inclusion5 decks25 decks
14%synergy
Urza's Saga
16%inclusion4 decks25 decks
4%synergy
Reliquary Tower
16%inclusion4 decks25 decks
-18%synergy
Emergence Zone
12%inclusion3 decks25 decks
10%synergy
Shizo, Death's Storehouse
8.0%inclusion2 decks25 decks
6%synergy
Halimar Depths
8.0%inclusion2 decks25 decks
3%synergy
Eiganjo, Seat of the Empire
8.0%inclusion2 decks25 decks
3%synergy
Urborg, Tomb of Yawgmoth
8.0%inclusion2 decks25 decks
-5%synergy
Rogue's Passage
8.0%inclusion2 decks25 decks
-2%synergy
Jidoor, Aristocratic Capital
5.3%inclusion1 decks19 decks
4%synergy
Mana Artifacts
Sol Ring
92%inclusion23 decks25 decks
2%synergy
Arcane Signet
80%inclusion20 decks25 decks
-8%synergy
Talisman of Dominance
68%inclusion17 decks25 decks
18%synergy
Talisman of Progress
64%inclusion16 decks25 decks
20%synergy
Talisman of Hierarchy
60%inclusion15 decks25 decks
16%synergy
Fellwar Stone
36%inclusion9 decks25 decks
3%synergy
Chrome Mox
28%inclusion7 decks25 decks
19%synergy
Lotus Petal
24%inclusion6 decks25 decks
14%synergy
Azorius Signet
24%inclusion6 decks25 decks
-7%synergy
Mox Opal
20%inclusion5 decks25 decks
12%synergy
Orzhov Signet
20%inclusion5 decks25 decks
-13%synergy
Mana Vault
16%inclusion4 decks25 decks
7%synergy
Mox Amber
16%inclusion4 decks25 decks
10%synergy
Dimir Signet
16%inclusion4 decks25 decks
-15%synergy
Lion's Eye Diamond
16%inclusion4 decks25 decks
14%synergy
Mox Diamond
12%inclusion3 decks25 decks
5%synergy
Hourglass of the Lost
8.0%inclusion2 decks25 decks
8%synergy
Lands
Command Tower
100%inclusion25 decks25 decks
7%synergy
Island
92%inclusion23 decks25 decks
-1%synergy
Swamp
88%inclusion22 decks25 decks
-4%synergy
Plains
88%inclusion22 decks25 decks
-4%synergy
Hallowed Fountain
80%inclusion20 decks25 decks
30%synergy
Godless Shrine
76%inclusion19 decks25 decks
25%synergy
Watery Grave
76%inclusion19 decks25 decks
25%synergy
Exotic Orchard
64%inclusion16 decks25 decks
5%synergy
Polluted Delta
64%inclusion16 decks25 decks
26%synergy
Flooded Strand
64%inclusion16 decks25 decks
26%synergy
Adarkar Wastes
60%inclusion15 decks25 decks
28%synergy
Caves of Koilos
52%inclusion13 decks25 decks
16%synergy
Sea of Clouds
52%inclusion13 decks25 decks
17%synergy
Morphic Pool
52%inclusion13 decks25 decks
18%synergy
Marsh Flats
52%inclusion13 decks25 decks
16%synergy
Underground River
48%inclusion12 decks25 decks
14%synergy
Vault of Champions
48%inclusion12 decks25 decks
16%synergy
Raffine's Tower
44%inclusion11 decks25 decks
3%synergy
Arcane Sanctum
44%inclusion11 decks25 decks
-10%synergy
Undercity Sewers
36%inclusion9 decks25 decks
21%synergy
Valgavoth's Lair
36%inclusion9 decks25 decks
33%synergy
City of Brass
36%inclusion9 decks25 decks
21%synergy
Glacial Fortress
32%inclusion8 decks25 decks
-10%synergy
Shadowy Backstreet
32%inclusion8 decks25 decks
19%synergy
Isolated Chapel
32%inclusion8 decks25 decks
-9%synergy
Meticulous Archive
32%inclusion8 decks25 decks
18%synergy
Mana Confluence
32%inclusion8 decks25 decks
18%synergy
Gloomlake Verge
32%inclusion8 decks25 decks
21%synergy
Tainted Isle
24%inclusion6 decks25 decks
18%synergy
Prairie Stream
24%inclusion6 decks25 decks
-17%synergy
Azorius Chancery
20%inclusion5 decks25 decks
6%synergy
Windswept Heath
20%inclusion5 decks25 decks
10%synergy
Tainted Field
20%inclusion5 decks25 decks
13%synergy
Verdant Catacombs
20%inclusion5 decks25 decks
10%synergy
Orzhov Basilica
20%inclusion5 decks25 decks
5%synergy
Deserted Beach
20%inclusion5 decks25 decks
-1%synergy
Floodfarm Verge
20%inclusion5 decks25 decks
9%synergy
Bloodstained Mire
20%inclusion5 decks25 decks
9%synergy
Tundra
16%inclusion4 decks25 decks
0%synergy
Misty Rainforest
16%inclusion4 decks25 decks
5%synergy
Bleachbone Verge
16%inclusion4 decks25 decks
7%synergy
Dimir Aqueduct
16%inclusion4 decks25 decks
3%synergy
Port Town
16%inclusion4 decks25 decks
-1%synergy
Underground Sea
16%inclusion4 decks25 decks
0%synergy
Drowned Catacomb
16%inclusion4 decks25 decks
-21%synergy
Arid Mesa
16%inclusion4 decks25 decks
6%synergy
Scrubland
16%inclusion4 decks25 decks
0%synergy
Scalding Tarn
16%inclusion4 decks25 decks
5%synergy
Temple of Silence
16%inclusion4 decks25 decks
-3%synergy
Clearwater Pathway
12%inclusion3 decks25 decks
5%synergy
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