The Master of Keys (Commander) - Expensive 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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Sorceries
Utility Artifacts
Enchantments
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Dream Beavers
50%inclusion1 decks2 decks
50%synergy
Mornsong Aria
40%inclusion2 decks5 decks
39%synergy
Voracious Tome-Skimmer
20%inclusion1 decks5 decks
19%synergy
High Synergy Cards
Necromancy
100%inclusion29 decks29 decks
95%synergy
Wan Shi Tong, Librarian
100%inclusion6 decks6 decks
95%synergy
Dance of the Dead
93%inclusion27 decks29 decks
91%synergy
Silence
100%inclusion29 decks29 decks
90%synergy
Abdel Adrian, Gorion's Ward
90%inclusion26 decks29 decks
88%synergy
Sevinne's Reclamation
97%inclusion28 decks29 decks
88%synergy
Animate Dead
97%inclusion28 decks29 decks
87%synergy
Entomb
93%inclusion27 decks29 decks
86%synergy
Tainted Pact
93%inclusion27 decks29 decks
86%synergy
Intuition
86%inclusion25 decks29 decks
85%synergy
Top Cards
Dark Ritual
100%inclusion29 decks29 decks
81%synergy
Esper Sentinel
100%inclusion29 decks29 decks
72%synergy
Mystic Remora
100%inclusion29 decks29 decks
79%synergy
Force of Negation
93%inclusion27 decks29 decks
81%synergy
Orcish Bowmasters
93%inclusion27 decks29 decks
82%synergy
Smothering Tithe
90%inclusion26 decks29 decks
58%synergy
Flusterstorm
90%inclusion26 decks29 decks
82%synergy
Grand Abolisher
90%inclusion26 decks29 decks
75%synergy
Pact of Negation
90%inclusion26 decks29 decks
82%synergy
Imperial Seal
86%inclusion25 decks29 decks
79%synergy
Game Changers
Ancient Tomb
100%inclusion29 decks29 decks
87%synergy
Demonic Tutor
100%inclusion29 decks29 decks
79%synergy
Force of Will
100%inclusion29 decks29 decks
87%synergy
Enlightened Tutor
100%inclusion29 decks29 decks
80%synergy
Vampiric Tutor
100%inclusion29 decks29 decks
83%synergy
Mox Diamond
100%inclusion29 decks29 decks
93%synergy
Rhystic Study
97%inclusion28 decks29 decks
65%synergy
Mana Vault
97%inclusion28 decks29 decks
87%synergy
Chrome Mox
97%inclusion28 decks29 decks
87%synergy
Thassa's Oracle
93%inclusion27 decks29 decks
84%synergy
Creatures
Ranger-Captain of Eos
86%inclusion25 decks29 decks
80%synergy
Lotho, Corrupt Shirriff
83%inclusion24 decks29 decks
66%synergy
Valley Floodcaller
62%inclusion18 decks29 decks
58%synergy
Opposition Agent
55%inclusion16 decks29 decks
47%synergy
Drannith Magistrate
48%inclusion14 decks29 decks
40%synergy
Mockingbird
48%inclusion14 decks29 decks
44%synergy
Displacer Kitten
45%inclusion13 decks29 decks
38%synergy
Auriok Salvagers
45%inclusion13 decks29 decks
45%synergy
Voice of Victory
44%inclusion7 decks16 decks
35%synergy
Hullbreaker Horror
38%inclusion11 decks29 decks
32%synergy
Archivist of Oghma
34%inclusion10 decks29 decks
28%synergy
Lurrus of the Dream-Den
34%inclusion10 decks29 decks
33%synergy
Hedron Crab
34%inclusion10 decks29 decks
34%synergy
Ledger Shredder
24%inclusion7 decks29 decks
15%synergy
Tataru Taru
23%inclusion3 decks13 decks
15%synergy
Snapcaster Mage
21%inclusion6 decks29 decks
19%synergy
Phyrexian Metamorph
21%inclusion6 decks29 decks
12%synergy
Talion, the Kindly Lord
21%inclusion6 decks29 decks
13%synergy
Psychic Frog
21%inclusion6 decks29 decks
14%synergy
Ghostly Pilferer
21%inclusion6 decks29 decks
13%synergy
Leonin Relic-Warder
17%inclusion5 decks29 decks
17%synergy
Faerie Mastermind
17%inclusion5 decks29 decks
8%synergy
High Fae Trickster
13%inclusion3 decks23 decks
8%synergy
Pollywog Prodigy
10%inclusion3 decks29 decks
6%synergy
Dauthi Voidwalker
10%inclusion3 decks29 decks
4%synergy
Symbiote Spider-Man
9.1%inclusion1 decks11 decks
9%synergy
Emet-Selch of the Third Seat
7.7%inclusion1 decks13 decks
-2%synergy
Volatile Stormdrake
6.9%inclusion2 decks29 decks
6%synergy
Hoarding Broodlord
6.9%inclusion2 decks29 decks
5%synergy
Consecrated Sphinx
6.9%inclusion2 decks29 decks
1%synergy
Cephalid Illusionist
6.9%inclusion2 decks29 decks
7%synergy
Walking Ballista
6.9%inclusion2 decks29 decks
4%synergy
Heliod, Sun-Crowned
6.9%inclusion2 decks29 decks
3%synergy
Gilded Drake
6.9%inclusion2 decks29 decks
5%synergy
Laboratory Maniac
6.9%inclusion2 decks29 decks
4%synergy
Nomads en-Kor
6.9%inclusion2 decks29 decks
7%synergy
Nezahal, Primal Tide
6.9%inclusion2 decks29 decks
3%synergy
Academy Rector
6.9%inclusion2 decks29 decks
6%synergy
Instants
Mindbreak Trap
86%inclusion25 decks29 decks
79%synergy
Demonic Consultation
86%inclusion25 decks29 decks
78%synergy
Mental Misstep
83%inclusion24 decks29 decks
76%synergy
Swan Song
83%inclusion24 decks29 decks
63%synergy
Mystical Tutor
83%inclusion24 decks29 decks
72%synergy
Borne Upon a Wind
79%inclusion23 decks29 decks
74%synergy
Swords to Plowshares
76%inclusion22 decks29 decks
8%synergy
Fierce Guardianship
72%inclusion21 decks29 decks
52%synergy
Cabal Ritual
66%inclusion19 decks29 decks
62%synergy
Cyclonic Rift
52%inclusion15 decks29 decks
28%synergy
An Offer You Can't Refuse
45%inclusion13 decks29 decks
18%synergy
Gifts Ungiven
41%inclusion12 decks29 decks
39%synergy
Chain of Vapor
38%inclusion11 decks29 decks
35%synergy
Mana Drain
34%inclusion10 decks29 decks
17%synergy
Brain Freeze
31%inclusion9 decks29 decks
30%synergy
Retraction Helix
24%inclusion7 decks29 decks
23%synergy
Darkblast
24%inclusion7 decks29 decks
24%synergy
Into the Flood Maw
24%inclusion7 decks29 decks
20%synergy
Culling the Weak
17%inclusion5 decks29 decks
16%synergy
Ad Nauseam
17%inclusion5 decks29 decks
15%synergy
Sink into Stupor
17%inclusion5 decks29 decks
5%synergy
Path to Exile
17%inclusion5 decks29 decks
-25%synergy
Banishing Knack
14%inclusion4 decks29 decks
13%synergy
Deadly Rollick
10%inclusion3 decks29 decks
-4%synergy
Lim-Dûl's Vault
10%inclusion3 decks29 decks
7%synergy
Strix Serenade
10%inclusion3 decks29 decks
7%synergy
Sacrifice
6.9%inclusion2 decks29 decks
6%synergy
Muddle the Mixture
6.9%inclusion2 decks29 decks
3%synergy
Orim's Chant
6.9%inclusion2 decks29 decks
5%synergy
Dramatic Reversal
6.9%inclusion2 decks29 decks
5%synergy
Saw in Half
6.9%inclusion2 decks29 decks
5%synergy
Sorceries
Reanimate
52%inclusion15 decks29 decks
36%synergy
Unmarked Grave
24%inclusion7 decks29 decks
23%synergy
Lively Dirge
21%inclusion6 decks29 decks
19%synergy
Mnemonic Betrayal
21%inclusion6 decks29 decks
18%synergy
Toxic Deluge
21%inclusion6 decks29 decks
1%synergy
Cabal Therapy
17%inclusion5 decks29 decks
17%synergy
Diabolic Intent
17%inclusion5 decks29 decks
12%synergy
Windfall
17%inclusion5 decks29 decks
4%synergy
Demonic Counsel
17%inclusion5 decks29 decks
16%synergy
Beseech the Mirror
17%inclusion5 decks29 decks
13%synergy
Yawgmoth's Will
10%inclusion3 decks29 decks
9%synergy
Timetwister
10%inclusion3 decks29 decks
9%synergy
Singularity Rupture
9.1%inclusion1 decks11 decks
7%synergy
Utility Artifacts
The One Ring
72%inclusion21 decks29 decks
59%synergy
Wishclaw Talisman
55%inclusion16 decks29 decks
47%synergy
Vexing Bauble
17%inclusion5 decks29 decks
15%synergy
Mesmeric Orb
10%inclusion3 decks29 decks
9%synergy
Agatha's Soul Cauldron
10%inclusion3 decks29 decks
10%synergy
Cursed Totem
6.9%inclusion2 decks29 decks
5%synergy
Altar of the Brood
6.9%inclusion2 decks29 decks
5%synergy
Isochron Scepter
6.9%inclusion2 decks29 decks
5%synergy
Enchantments
Dress Down
83%inclusion24 decks29 decks
80%synergy
Necropotence
66%inclusion19 decks29 decks
59%synergy
Amphibian Downpour
66%inclusion19 decks29 decks
61%synergy
Tinybones Joins Up
59%inclusion17 decks29 decks
57%synergy
Blind Obedience
59%inclusion17 decks29 decks
46%synergy
The Meathook Massacre
45%inclusion13 decks29 decks
41%synergy
Ripples of Undeath
41%inclusion12 decks29 decks
39%synergy
Static Prison
41%inclusion12 decks29 decks
41%synergy
Copy Artifact
38%inclusion11 decks29 decks
37%synergy
Counterbalance
34%inclusion10 decks29 decks
33%synergy
Founding the Third Path
34%inclusion10 decks29 decks
34%synergy
Steal Enchantment
34%inclusion10 decks29 decks
34%synergy
Mirrormade
34%inclusion10 decks29 decks
25%synergy
Touch the Spirit Realm
31%inclusion9 decks29 decks
29%synergy
Chains of Mephistopheles
31%inclusion9 decks29 decks
31%synergy
Seal of Removal
17%inclusion5 decks29 decks
17%synergy
Copy Enchantment
14%inclusion4 decks29 decks
9%synergy
Power Artifact
14%inclusion4 decks29 decks
13%synergy
Seal of Cleansing
14%inclusion4 decks29 decks
12%synergy
Trouble in Pairs
14%inclusion4 decks29 decks
8%synergy
Leyline of Anticipation
10%inclusion3 decks29 decks
6%synergy
Chthonian Nightmare
10%inclusion3 decks29 decks
10%synergy
Aura of Silence
10%inclusion3 decks29 decks
7%synergy
Grasp of Fate
6.9%inclusion2 decks29 decks
1%synergy
Teval's Judgment
6.3%inclusion1 decks16 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
38%inclusion11 decks29 decks
30%synergy
Tezzeret, Cruel Captain
9.1%inclusion1 decks11 decks
7%synergy
Jace, Wielder of Mysteries
6.9%inclusion2 decks29 decks
5%synergy
Ashiok, Dream Render
6.9%inclusion2 decks29 decks
5%synergy
Utility Lands
Otawara, Soaring City
90%inclusion26 decks29 decks
71%synergy
Urza's Saga
48%inclusion14 decks29 decks
36%synergy
Emergence Zone
38%inclusion11 decks29 decks
36%synergy
Serra's Sanctum
34%inclusion10 decks29 decks
33%synergy
Minamo, School at Water's Edge
28%inclusion8 decks29 decks
24%synergy
Cephalid Coliseum
28%inclusion8 decks29 decks
24%synergy
City of Traitors
28%inclusion8 decks29 decks
26%synergy
Urborg, Tomb of Yawgmoth
17%inclusion5 decks29 decks
4%synergy
Hall of Heliod's Generosity
6.9%inclusion2 decks29 decks
-6%synergy
Takenuma, Abandoned Mire
6.9%inclusion2 decks29 decks
0%synergy
Strip Mine
6.9%inclusion2 decks29 decks
5%synergy
Mistrise Village
6.3%inclusion1 decks16 decks
3%synergy
Mana Artifacts
Arcane Signet
100%inclusion29 decks29 decks
12%synergy
Sol Ring
100%inclusion29 decks29 decks
10%synergy
Lotus Petal
97%inclusion28 decks29 decks
86%synergy
Mox Opal
90%inclusion26 decks29 decks
81%synergy
Lion's Eye Diamond
90%inclusion26 decks29 decks
88%synergy
Talisman of Dominance
83%inclusion24 decks29 decks
33%synergy
Fellwar Stone
79%inclusion23 decks29 decks
46%synergy
Grim Monolith
62%inclusion18 decks29 decks
59%synergy
Mox Amber
41%inclusion12 decks29 decks
35%synergy
Talisman of Hierarchy
41%inclusion12 decks29 decks
-2%synergy
Talisman of Progress
38%inclusion11 decks29 decks
-6%synergy
Basalt Monolith
10%inclusion3 decks29 decks
8%synergy
Lands
Tundra
100%inclusion29 decks29 decks
84%synergy
Command Tower
100%inclusion29 decks29 decks
7%synergy
Underground Sea
100%inclusion29 decks29 decks
84%synergy
Godless Shrine
100%inclusion29 decks29 decks
49%synergy
Scrubland
100%inclusion29 decks29 decks
84%synergy
Marsh Flats
100%inclusion29 decks29 decks
64%synergy
Polluted Delta
100%inclusion29 decks29 decks
62%synergy
Hallowed Fountain
100%inclusion29 decks29 decks
50%synergy
Flooded Strand
100%inclusion29 decks29 decks
62%synergy
Watery Grave
100%inclusion29 decks29 decks
50%synergy
Gemstone Caverns
97%inclusion28 decks29 decks
89%synergy
City of Brass
97%inclusion28 decks29 decks
82%synergy
Mana Confluence
93%inclusion27 decks29 decks
79%synergy
Misty Rainforest
86%inclusion25 decks29 decks
75%synergy
Verdant Catacombs
86%inclusion25 decks29 decks
76%synergy
Scalding Tarn
83%inclusion24 decks29 decks
72%synergy
Bloodstained Mire
83%inclusion24 decks29 decks
72%synergy
Arid Mesa
79%inclusion23 decks29 decks
70%synergy
Windswept Heath
76%inclusion22 decks29 decks
66%synergy
Exotic Orchard
69%inclusion20 decks29 decks
10%synergy
Morphic Pool
59%inclusion17 decks29 decks
25%synergy
Undercity Sewers
52%inclusion15 decks29 decks
37%synergy
Island
45%inclusion13 decks29 decks
-48%synergy
Sea of Clouds
38%inclusion11 decks29 decks
2%synergy
Cavern of Souls
31%inclusion9 decks29 decks
24%synergy
Vault of Champions
31%inclusion9 decks29 decks
-2%synergy
Starting Town
31%inclusion4 decks13 decks
27%synergy
Swamp
28%inclusion8 decks29 decks
-64%synergy
Meticulous Archive
21%inclusion6 decks29 decks
7%synergy
Sink into Stupor
17%inclusion5 decks29 decks
5%synergy
Plains
14%inclusion4 decks29 decks
-78%synergy
Forbidden Orchard
10%inclusion3 decks29 decks
8%synergy
Prismatic Vista
6.9%inclusion2 decks29 decks
3%synergy
Gemstone Mine
6.9%inclusion2 decks29 decks
6%synergy
Shadowy Backstreet
6.9%inclusion2 decks29 decks
-6%synergy
Spire of Industry
6.9%inclusion2 decks29 decks
-1%synergy
Talon Gates of Madara
6.9%inclusion2 decks29 decks
6%synergy
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