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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Wan Shi Tong, Librarian
13%inclusion1 decks8 decks
7%synergy
High Synergy Cards
Ripples of Undeath
78%inclusion18 decks23 decks
76%synergy
Necromancy
78%inclusion18 decks23 decks
74%synergy
Animate Dead
83%inclusion19 decks23 decks
73%synergy
Mystic Remora
91%inclusion21 decks23 decks
70%synergy
Dress Down
70%inclusion16 decks23 decks
67%synergy
Sevinne's Reclamation
74%inclusion17 decks23 decks
65%synergy
Abdel Adrian, Gorion's Ward
61%inclusion14 decks23 decks
59%synergy
Entity Tracker
65%inclusion15 decks23 decks
59%synergy
Mesmeric Orb
57%inclusion13 decks23 decks
55%synergy
Dance of the Dead
57%inclusion13 decks23 decks
54%synergy
Top Cards
Blind Obedience
61%inclusion14 decks23 decks
48%synergy
Entomb
57%inclusion13 decks23 decks
50%synergy
Amphibian Downpour
57%inclusion13 decks23 decks
52%synergy
Swords to Plowshares
57%inclusion13 decks23 decks
-12%synergy
Inquisitive Glimmer
52%inclusion12 decks23 decks
45%synergy
Dark Ritual
52%inclusion12 decks23 decks
33%synergy
An Offer You Can't Refuse
48%inclusion11 decks23 decks
21%synergy
Lotho, Corrupt Shirriff
43%inclusion10 decks23 decks
27%synergy
Scrabbling Skullcrab
43%inclusion10 decks23 decks
42%synergy
Tinybones Joins Up
43%inclusion10 decks23 decks
42%synergy
Game Changers
Rhystic Study
78%inclusion18 decks23 decks
46%synergy
Smothering Tithe
70%inclusion16 decks23 decks
37%synergy
Enlightened Tutor
65%inclusion15 decks23 decks
45%synergy
Demonic Tutor
48%inclusion11 decks23 decks
26%synergy
Thassa's Oracle
43%inclusion10 decks23 decks
34%synergy
Vampiric Tutor
39%inclusion9 decks23 decks
21%synergy
Mystical Tutor
35%inclusion8 decks23 decks
23%synergy
Ancient Tomb
30%inclusion7 decks23 decks
17%synergy
Necropotence
30%inclusion7 decks23 decks
24%synergy
Force of Will
30%inclusion7 decks23 decks
18%synergy
Creatures
Overlord of the Floodpits
35%inclusion8 decks23 decks
31%synergy
Esper Sentinel
35%inclusion8 decks23 decks
7%synergy
Overlord of the Balemurk
35%inclusion8 decks23 decks
33%synergy
Mesa Enchantress
35%inclusion8 decks23 decks
26%synergy
Grand Abolisher
35%inclusion8 decks23 decks
20%synergy
Displacer Kitten
30%inclusion7 decks23 decks
23%synergy
Starfield Mystic
30%inclusion7 decks23 decks
24%synergy
Gravebreaker Lamia
30%inclusion7 decks23 decks
29%synergy
Fear of Impostors
30%inclusion7 decks23 decks
29%synergy
Zur, Eternal Schemer
30%inclusion7 decks23 decks
27%synergy
Ledger Shredder
30%inclusion7 decks23 decks
22%synergy
Orcish Bowmasters
30%inclusion7 decks23 decks
19%synergy
Lurrus of the Dream-Den
26%inclusion6 decks23 decks
24%synergy
Demon of Fate's Design
26%inclusion6 decks23 decks
21%synergy
Hedron Crab
26%inclusion6 decks23 decks
25%synergy
Zur the Enchanter
26%inclusion6 decks23 decks
21%synergy
Hullbreaker Horror
22%inclusion5 decks23 decks
16%synergy
Opposition Agent
17%inclusion4 decks23 decks
9%synergy
Grand Arbiter Augustin IV
17%inclusion4 decks23 decks
12%synergy
Valley Floodcaller
17%inclusion4 decks23 decks
13%synergy
Victor, Valgavoth's Seneschal
17%inclusion4 decks23 decks
15%synergy
Enduring Curiosity
17%inclusion4 decks23 decks
10%synergy
Fear of Sleep Paralysis
17%inclusion4 decks23 decks
12%synergy
Laboratory Maniac
17%inclusion4 decks23 decks
14%synergy
Mockingbird
17%inclusion4 decks23 decks
13%synergy
Doomwake Giant
17%inclusion4 decks23 decks
11%synergy
Grim Guardian
17%inclusion4 decks23 decks
15%synergy
Heliod, the Radiant Dawn
17%inclusion4 decks23 decks
14%synergy
Bruvac the Grandiloquent
13%inclusion3 decks23 decks
12%synergy
Talion, the Kindly Lord
13%inclusion3 decks23 decks
5%synergy
Gremlin Tamer
13%inclusion3 decks23 decks
12%synergy
Balemurk Leech
13%inclusion3 decks23 decks
12%synergy
Alseid of Life's Bounty
13%inclusion3 decks23 decks
12%synergy
Psychic Frog
13%inclusion3 decks23 decks
6%synergy
Dauthi Voidwalker
13%inclusion3 decks23 decks
7%synergy
Ghostly Pilferer
13%inclusion3 decks23 decks
6%synergy
Emet-Selch of the Third Seat
13%inclusion2 decks16 decks
3%synergy
Archivist of Oghma
8.7%inclusion2 decks23 decks
2%synergy
Peregrine Drake
8.7%inclusion2 decks23 decks
5%synergy
Snapcaster Mage
8.7%inclusion2 decks23 decks
7%synergy
Archon of Sun's Grace
8.7%inclusion2 decks23 decks
4%synergy
Walking Ballista
8.7%inclusion2 decks23 decks
6%synergy
Zellix, Sanity Flayer
8.7%inclusion2 decks23 decks
8%synergy
Sage of Mysteries
8.7%inclusion2 decks23 decks
8%synergy
Heliod, Sun-Crowned
8.7%inclusion2 decks23 decks
5%synergy
Silent Hallcreeper
8.7%inclusion2 decks23 decks
4%synergy
Moon-Blessed Cleric
8.7%inclusion2 decks23 decks
4%synergy
Leonin Relic-Warder
8.7%inclusion2 decks23 decks
8%synergy
Enduring Tenacity
8.7%inclusion2 decks23 decks
1%synergy
Skullsnap Nuisance
8.7%inclusion2 decks23 decks
8%synergy
Instants
Swan Song
43%inclusion10 decks23 decks
24%synergy
Dovin's Veto
35%inclusion8 decks23 decks
10%synergy
Path to Exile
35%inclusion8 decks23 decks
-7%synergy
Mana Drain
30%inclusion7 decks23 decks
13%synergy
Silence
30%inclusion7 decks23 decks
20%synergy
Fierce Guardianship
26%inclusion6 decks23 decks
5%synergy
Cyclonic Rift
26%inclusion6 decks23 decks
2%synergy
Gifts Ungiven
22%inclusion5 decks23 decks
19%synergy
Void Rend
22%inclusion5 decks23 decks
-12%synergy
Arcane Denial
22%inclusion5 decks23 decks
1%synergy
Teferi's Protection
17%inclusion4 decks23 decks
1%synergy
Frantic Search
17%inclusion4 decks23 decks
0%synergy
Brainstorm
17%inclusion4 decks23 decks
0%synergy
Intuition
17%inclusion4 decks23 decks
16%synergy
Cabal Ritual
17%inclusion4 decks23 decks
14%synergy
Demonic Consultation
17%inclusion4 decks23 decks
9%synergy
Force of Negation
17%inclusion4 decks23 decks
6%synergy
Counterspell
17%inclusion4 decks23 decks
-24%synergy
Mental Misstep
13%inclusion3 decks23 decks
6%synergy
Retraction Helix
13%inclusion3 decks23 decks
12%synergy
Negate
13%inclusion3 decks23 decks
-4%synergy
Brain Freeze
13%inclusion3 decks23 decks
12%synergy
Mindbreak Trap
13%inclusion3 decks23 decks
6%synergy
Strix Serenade
13%inclusion3 decks23 decks
9%synergy
Flusterstorm
13%inclusion3 decks23 decks
5%synergy
Sink into Stupor
13%inclusion3 decks23 decks
0%synergy
Borne Upon a Wind
13%inclusion3 decks23 decks
8%synergy
Pact of Negation
13%inclusion3 decks23 decks
5%synergy
Pongify
8.7%inclusion2 decks23 decks
6%synergy
Muddle the Mixture
8.7%inclusion2 decks23 decks
5%synergy
Drown in the Loch
8.7%inclusion2 decks23 decks
7%synergy
Tainted Pact
8.7%inclusion2 decks23 decks
1%synergy
Orim's Chant
8.7%inclusion2 decks23 decks
7%synergy
Lim-Dûl's Vault
8.7%inclusion2 decks23 decks
5%synergy
Darkblast
8.7%inclusion2 decks23 decks
9%synergy
Into the Flood Maw
8.7%inclusion2 decks23 decks
5%synergy
Prismatic Strands
8.7%inclusion2 decks23 decks
9%synergy
Perplex
8.7%inclusion2 decks23 decks
7%synergy
Ad Nauseam
8.7%inclusion2 decks23 decks
6%synergy
Delay
8.7%inclusion2 decks23 decks
6%synergy
Otherworldly Gaze
8.7%inclusion2 decks23 decks
6%synergy
Miscast
8.7%inclusion2 decks23 decks
7%synergy
Sorceries
Windfall
39%inclusion9 decks23 decks
25%synergy
Reanimate
26%inclusion6 decks23 decks
10%synergy
Lively Dirge
22%inclusion5 decks23 decks
20%synergy
Demonic Counsel
22%inclusion5 decks23 decks
21%synergy
Toxic Deluge
17%inclusion4 decks23 decks
-2%synergy
Unmarked Grave
13%inclusion3 decks23 decks
12%synergy
Farewell
13%inclusion3 decks23 decks
0%synergy
Glimpse the Unthinkable
13%inclusion3 decks23 decks
13%synergy
Extinguish All Hope
13%inclusion3 decks23 decks
11%synergy
Maddening Cacophony
13%inclusion3 decks23 decks
12%synergy
Supreme Verdict
8.7%inclusion2 decks23 decks
-6%synergy
Resurgent Belief
8.7%inclusion2 decks23 decks
7%synergy
Imperial Seal
8.7%inclusion2 decks23 decks
1%synergy
Idyllic Tutor
8.7%inclusion2 decks23 decks
4%synergy
Doomsday
8.7%inclusion2 decks23 decks
8%synergy
Buried Alive
8.7%inclusion2 decks23 decks
5%synergy
Rite of Oblivion
8.7%inclusion2 decks23 decks
8%synergy
Damn
8.7%inclusion2 decks23 decks
-12%synergy
Fractured Sanity
8.7%inclusion2 decks23 decks
8%synergy
Grim Tutor
8.7%inclusion2 decks23 decks
5%synergy
Dance of the Manse
8.7%inclusion2 decks23 decks
5%synergy
Singularity Rupture
7.1%inclusion1 decks14 decks
5%synergy
Space-Time Anomaly
7.1%inclusion1 decks14 decks
5%synergy
Utility Artifacts
The One Ring
26%inclusion6 decks23 decks
12%synergy
Wishclaw Talisman
26%inclusion6 decks23 decks
18%synergy
Altar of the Brood
17%inclusion4 decks23 decks
16%synergy
Sensei's Divining Top
13%inclusion3 decks23 decks
3%synergy
Lightning Greaves
13%inclusion3 decks23 decks
-9%synergy
Mindcrank
8.7%inclusion2 decks23 decks
7%synergy
Isochron Scepter
8.7%inclusion2 decks23 decks
6%synergy
The Darkness Crystal
6.3%inclusion1 decks16 decks
4%synergy
Enchantments
Mirrormade
43%inclusion10 decks23 decks
34%synergy
The Meathook Massacre
39%inclusion9 decks23 decks
36%synergy
Ghostly Prison
39%inclusion9 decks23 decks
18%synergy
Propaganda
39%inclusion9 decks23 decks
13%synergy
Static Prison
35%inclusion8 decks23 decks
34%synergy
Grasp of Fate
30%inclusion7 decks23 decks
24%synergy
Seal of Cleansing
30%inclusion7 decks23 decks
29%synergy
Secret Arcade // Dusty Parlor
30%inclusion7 decks23 decks
25%synergy
Touch the Spirit Realm
26%inclusion6 decks23 decks
24%synergy
Authority of the Consuls
26%inclusion6 decks23 decks
15%synergy
Estrid's Invocation
26%inclusion6 decks23 decks
22%synergy
Sphere of Safety
26%inclusion6 decks23 decks
17%synergy
Cemetery Tampering
26%inclusion6 decks23 decks
25%synergy
Black Market Connections
26%inclusion6 decks23 decks
12%synergy
Cacophony Unleashed
22%inclusion5 decks23 decks
20%synergy
Out of the Tombs
22%inclusion5 decks23 decks
21%synergy
Starfield of Nyx
22%inclusion5 decks23 decks
18%synergy
Leyline of Anticipation
22%inclusion5 decks23 decks
17%synergy
Land Tax
22%inclusion5 decks23 decks
16%synergy
Solitary Confinement
22%inclusion5 decks23 decks
20%synergy
Greater Auramancy
22%inclusion5 decks23 decks
17%synergy
Counterbalance
17%inclusion4 decks23 decks
16%synergy
Copy Enchantment
17%inclusion4 decks23 decks
13%synergy
Exquisite Blood
17%inclusion4 decks23 decks
11%synergy
The Tale of Tamiyo
17%inclusion4 decks23 decks
17%synergy
Nowhere to Run
17%inclusion4 decks23 decks
16%synergy
Darksteel Mutation
13%inclusion3 decks23 decks
7%synergy
Imprisoned in the Moon
13%inclusion3 decks23 decks
7%synergy
Chronic Flooding
13%inclusion3 decks23 decks
13%synergy
Attunement
13%inclusion3 decks23 decks
13%synergy
Monologue Tax
13%inclusion3 decks23 decks
7%synergy
Enchanted Evening
13%inclusion3 decks23 decks
11%synergy
Copy Land
13%inclusion3 decks23 decks
12%synergy
Sheltered by Ghosts
13%inclusion3 decks23 decks
10%synergy
Ethereal Armor
13%inclusion3 decks23 decks
8%synergy
Phyrexian Arena
13%inclusion3 decks23 decks
-1%synergy
Trouble in Pairs
13%inclusion3 decks23 decks
8%synergy
Stillness in Motion
10%inclusion2 decks21 decks
9%synergy
Founding the Third Path
8.7%inclusion2 decks23 decks
9%synergy
Stony Silence
8.7%inclusion2 decks23 decks
8%synergy
Court of Cunning
8.7%inclusion2 decks23 decks
8%synergy
Lunar Force
8.7%inclusion2 decks23 decks
9%synergy
Psychic Corrosion
8.7%inclusion2 decks23 decks
7%synergy
Rule of Law
8.7%inclusion2 decks23 decks
6%synergy
Steal Enchantment
8.7%inclusion2 decks23 decks
8%synergy
Hopeless Nightmare
8.7%inclusion2 decks23 decks
8%synergy
Copy Artifact
8.7%inclusion2 decks23 decks
8%synergy
Shark Typhoon
8.7%inclusion2 decks23 decks
3%synergy
Karmic Justice
8.7%inclusion2 decks23 decks
6%synergy
All That Glitters
8.7%inclusion2 decks23 decks
0%synergy
Planeswalkers
Teferi, Time Raveler
30%inclusion7 decks23 decks
22%synergy
Ashiok, Dream Render
8.7%inclusion2 decks23 decks
7%synergy
Utility Lands
Otawara, Soaring City
43%inclusion10 decks23 decks
24%synergy
Bojuka Bog
39%inclusion9 decks23 decks
12%synergy
Cephalid Coliseum
35%inclusion8 decks23 decks
31%synergy
Hall of Heliod's Generosity
26%inclusion6 decks23 decks
13%synergy
Serra's Sanctum
22%inclusion5 decks23 decks
20%synergy
Takenuma, Abandoned Mire
22%inclusion5 decks23 decks
15%synergy
Shizo, Death's Storehouse
13%inclusion3 decks23 decks
11%synergy
Urza's Saga
13%inclusion3 decks23 decks
1%synergy
Emergence Zone
13%inclusion3 decks23 decks
11%synergy
Reliquary Tower
13%inclusion3 decks23 decks
-21%synergy
Eiganjo, Seat of the Empire
8.7%inclusion2 decks23 decks
4%synergy
Temple of the False God
8.7%inclusion2 decks23 decks
1%synergy
Urborg, Tomb of Yawgmoth
8.7%inclusion2 decks23 decks
-5%synergy
Rogue's Passage
8.7%inclusion2 decks23 decks
-1%synergy
Jidoor, Aristocratic Capital
6.3%inclusion1 decks16 decks
5%synergy
Mana Artifacts
Sol Ring
100%inclusion23 decks23 decks
10%synergy
Arcane Signet
87%inclusion20 decks23 decks
-1%synergy
Talisman of Dominance
78%inclusion18 decks23 decks
29%synergy
Talisman of Progress
74%inclusion17 decks23 decks
31%synergy
Talisman of Hierarchy
70%inclusion16 decks23 decks
26%synergy
Fellwar Stone
35%inclusion8 decks23 decks
1%synergy
Lotus Petal
26%inclusion6 decks23 decks
15%synergy
Chrome Mox
26%inclusion6 decks23 decks
16%synergy
Azorius Signet
22%inclusion5 decks23 decks
-11%synergy
Mana Vault
17%inclusion4 decks23 decks
8%synergy
Dimir Signet
17%inclusion4 decks23 decks
-15%synergy
Mox Opal
17%inclusion4 decks23 decks
9%synergy
Orzhov Signet
17%inclusion4 decks23 decks
-17%synergy
Lion's Eye Diamond
17%inclusion4 decks23 decks
15%synergy
Mox Amber
13%inclusion3 decks23 decks
7%synergy
Mox Diamond
13%inclusion3 decks23 decks
6%synergy
Everflowing Chalice
8.7%inclusion2 decks23 decks
7%synergy
Hourglass of the Lost
8.7%inclusion2 decks23 decks
8%synergy
Lands
Command Tower
100%inclusion23 decks23 decks
8%synergy
Island
91%inclusion21 decks23 decks
-1%synergy
Swamp
87%inclusion20 decks23 decks
-4%synergy
Plains
87%inclusion20 decks23 decks
-4%synergy
Hallowed Fountain
78%inclusion18 decks23 decks
29%synergy
Watery Grave
78%inclusion18 decks23 decks
29%synergy
Godless Shrine
74%inclusion17 decks23 decks
24%synergy
Exotic Orchard
70%inclusion16 decks23 decks
11%synergy
Adarkar Wastes
65%inclusion15 decks23 decks
35%synergy
Polluted Delta
65%inclusion15 decks23 decks
28%synergy
Flooded Strand
61%inclusion14 decks23 decks
23%synergy
Caves of Koilos
57%inclusion13 decks23 decks
21%synergy
Sea of Clouds
57%inclusion13 decks23 decks
21%synergy
Marsh Flats
57%inclusion13 decks23 decks
20%synergy
Underground River
52%inclusion12 decks23 decks
20%synergy
Morphic Pool
52%inclusion12 decks23 decks
18%synergy
Vault of Champions
48%inclusion11 decks23 decks
15%synergy
Raffine's Tower
43%inclusion10 decks23 decks
2%synergy
Undercity Sewers
35%inclusion8 decks23 decks
21%synergy
Shadowy Backstreet
35%inclusion8 decks23 decks
22%synergy
Mana Confluence
35%inclusion8 decks23 decks
21%synergy
City of Brass
35%inclusion8 decks23 decks
20%synergy
Glacial Fortress
30%inclusion7 decks23 decks
-9%synergy
Arcane Sanctum
30%inclusion7 decks23 decks
-24%synergy
Isolated Chapel
30%inclusion7 decks23 decks
-8%synergy
Meticulous Archive
30%inclusion7 decks23 decks
17%synergy
Gloomlake Verge
30%inclusion7 decks23 decks
19%synergy
Prairie Stream
26%inclusion6 decks23 decks
-15%synergy
Valgavoth's Lair
26%inclusion6 decks23 decks
23%synergy
Windswept Heath
22%inclusion5 decks23 decks
12%synergy
Verdant Catacombs
22%inclusion5 decks23 decks
11%synergy
Drowned Catacomb
22%inclusion5 decks23 decks
-14%synergy
Bloodstained Mire
22%inclusion5 decks23 decks
11%synergy
Tainted Isle
17%inclusion4 decks23 decks
11%synergy
Tundra
17%inclusion4 decks23 decks
1%synergy
Misty Rainforest
17%inclusion4 decks23 decks
6%synergy
Tainted Field
17%inclusion4 decks23 decks
10%synergy
Underground Sea
17%inclusion4 decks23 decks
2%synergy
Gemstone Caverns
17%inclusion4 decks23 decks
10%synergy
Arid Mesa
17%inclusion4 decks23 decks
7%synergy
Scrubland
17%inclusion4 decks23 decks
1%synergy
Scalding Tarn
17%inclusion4 decks23 decks
6%synergy
Sunken Hollow
17%inclusion4 decks23 decks
-22%synergy
Temple of Silence
17%inclusion4 decks23 decks
-2%synergy
Clearwater Pathway
13%inclusion3 decks23 decks
6%synergy
Azorius Chancery
13%inclusion3 decks23 decks
-1%synergy
Brightclimb Pathway
13%inclusion3 decks23 decks
6%synergy
Temple of Deceit
13%inclusion3 decks23 decks
-5%synergy
Port Town
13%inclusion3 decks23 decks
-4%synergy
Snow-Covered Island
13%inclusion3 decks23 decks
10%synergy
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