The Master of Keys (Commander) - Expensive

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
Mana Artifacts
Lands
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Mornsong Aria
6.3%inclusion2 decks32 decks
6%synergy
Voracious Tome-Skimmer
3.1%inclusion1 decks32 decks
2%synergy
High Synergy Cards
Necromancy
95%inclusion649 decks680 decks
91%synergy
Abdel Adrian, Gorion's Ward
91%inclusion616 decks680 decks
89%synergy
Intuition
90%inclusion615 decks680 decks
89%synergy
Animate Dead
97%inclusion661 decks680 decks
88%synergy
Entomb
94%inclusion638 decks680 decks
87%synergy
Dance of the Dead
89%inclusion603 decks680 decks
86%synergy
Tainted Pact
94%inclusion636 decks680 decks
86%synergy
Dress Down
87%inclusion594 decks680 decks
85%synergy
Orcish Bowmasters
94%inclusion637 decks680 decks
83%synergy
Silence
93%inclusion632 decks680 decks
83%synergy
Top Cards
Mystic Remora
99%inclusion675 decks680 decks
78%synergy
Esper Sentinel
98%inclusion668 decks680 decks
71%synergy
Dark Ritual
95%inclusion644 decks680 decks
75%synergy
Smothering Tithe
94%inclusion640 decks680 decks
62%synergy
Force of Negation
91%inclusion620 decks680 decks
79%synergy
Swan Song
91%inclusion617 decks680 decks
71%synergy
Flusterstorm
90%inclusion609 decks680 decks
81%synergy
Mindbreak Trap
88%inclusion599 decks680 decks
81%synergy
Demonic Consultation
87%inclusion591 decks680 decks
79%synergy
Imperial Seal
86%inclusion584 decks680 decks
78%synergy
Game Changers
Rhystic Study
99%inclusion676 decks680 decks
67%synergy
Vampiric Tutor
99%inclusion671 decks680 decks
81%synergy
Demonic Tutor
99%inclusion671 decks680 decks
77%synergy
Mana Vault
99%inclusion670 decks680 decks
89%synergy
Mox Diamond
98%inclusion666 decks680 decks
91%synergy
Force of Will
98%inclusion666 decks680 decks
85%synergy
Chrome Mox
97%inclusion662 decks680 decks
88%synergy
Ancient Tomb
97%inclusion660 decks680 decks
84%synergy
Enlightened Tutor
97%inclusion660 decks680 decks
77%synergy
Thassa's Oracle
96%inclusion656 decks680 decks
87%synergy
Creatures
Grand Abolisher
85%inclusion580 decks680 decks
71%synergy
Ranger-Captain of Eos
85%inclusion575 decks680 decks
78%synergy
Lotho, Corrupt Shirriff
80%inclusion544 decks680 decks
63%synergy
Valley Floodcaller
74%inclusion503 decks680 decks
70%synergy
Wan Shi Tong, Librarian
58%inclusion50 decks86 decks
53%synergy
Voice of Victory
58%inclusion176 decks305 decks
49%synergy
Opposition Agent
57%inclusion389 decks680 decks
48%synergy
Displacer Kitten
53%inclusion358 decks680 decks
46%synergy
Hullbreaker Horror
50%inclusion341 decks680 decks
44%synergy
Auriok Salvagers
46%inclusion312 decks680 decks
46%synergy
Mockingbird
45%inclusion306 decks680 decks
41%synergy
Drannith Magistrate
44%inclusion299 decks680 decks
36%synergy
Archivist of Oghma
40%inclusion274 decks680 decks
33%synergy
Lurrus of the Dream-Den
35%inclusion240 decks680 decks
34%synergy
Ledger Shredder
31%inclusion208 decks680 decks
22%synergy
Talion, the Kindly Lord
28%inclusion193 decks680 decks
20%synergy
Phyrexian Metamorph
25%inclusion173 decks680 decks
17%synergy
Tataru Taru
25%inclusion58 decks229 decks
17%synergy
Pollywog Prodigy
23%inclusion153 decks680 decks
18%synergy
Hedron Crab
21%inclusion144 decks680 decks
21%synergy
Psychic Frog
21%inclusion141 decks680 decks
14%synergy
Faerie Mastermind
19%inclusion131 decks680 decks
10%synergy
Dauthi Voidwalker
14%inclusion96 decks680 decks
8%synergy
Ghostly Pilferer
13%inclusion89 decks680 decks
6%synergy
Hoarding Broodlord
9.4%inclusion64 decks680 decks
8%synergy
High Fae Trickster
9.3%inclusion47 decks505 decks
5%synergy
Snapcaster Mage
9.3%inclusion63 decks680 decks
7%synergy
Gilded Drake
9.1%inclusion62 decks680 decks
7%synergy
Leonin Relic-Warder
8.4%inclusion57 decks680 decks
8%synergy
Emet-Selch of the Third Seat
7.8%inclusion18 decks230 decks
-2%synergy
Volatile Stormdrake
7.8%inclusion53 decks680 decks
6%synergy
Overlord of the Balemurk
5.4%inclusion37 decks680 decks
3%synergy
Instants
Mental Misstep
85%inclusion578 decks680 decks
78%synergy
Pact of Negation
84%inclusion573 decks680 decks
76%synergy
Swords to Plowshares
76%inclusion517 decks680 decks
8%synergy
Borne Upon a Wind
76%inclusion514 decks680 decks
71%synergy
Fierce Guardianship
74%inclusion503 decks680 decks
53%synergy
Mystical Tutor
70%inclusion474 decks680 decks
58%synergy
Cabal Ritual
64%inclusion436 decks680 decks
61%synergy
Cyclonic Rift
58%inclusion397 decks680 decks
34%synergy
An Offer You Can't Refuse
56%inclusion382 decks680 decks
29%synergy
Chain of Vapor
47%inclusion317 decks680 decks
43%synergy
Mana Drain
38%inclusion255 decks680 decks
20%synergy
Into the Flood Maw
35%inclusion235 decks680 decks
31%synergy
Gifts Ungiven
29%inclusion196 decks680 decks
26%synergy
Ad Nauseam
25%inclusion170 decks680 decks
23%synergy
Sink into Stupor
25%inclusion168 decks680 decks
12%synergy
Culling the Weak
19%inclusion132 decks680 decks
18%synergy
Retraction Helix
19%inclusion128 decks680 decks
18%synergy
Brain Freeze
17%inclusion116 decks680 decks
16%synergy
Path to Exile
16%inclusion109 decks680 decks
-26%synergy
Darkblast
15%inclusion101 decks680 decks
15%synergy
Banishing Knack
12%inclusion79 decks680 decks
11%synergy
Dispel
8.7%inclusion59 decks680 decks
5%synergy
Saw in Half
8.1%inclusion55 decks680 decks
6%synergy
Deadly Rollick
7.9%inclusion54 decks680 decks
-6%synergy
Strix Serenade
7.4%inclusion50 decks680 decks
4%synergy
Dramatic Reversal
6.2%inclusion42 decks680 decks
4%synergy
Sacrifice
5.9%inclusion40 decks680 decks
5%synergy
Lim-Dûl's Vault
5.6%inclusion38 decks680 decks
2%synergy
Orim's Chant
5.1%inclusion35 decks680 decks
4%synergy
Muddle the Mixture
5.0%inclusion34 decks680 decks
1%synergy
Sorceries
Sevinne's Reclamation
71%inclusion485 decks680 decks
62%synergy
Reanimate
36%inclusion242 decks680 decks
20%synergy
Toxic Deluge
34%inclusion234 decks680 decks
15%synergy
Windfall
30%inclusion202 decks680 decks
16%synergy
Beseech the Mirror
26%inclusion178 decks680 decks
22%synergy
Mnemonic Betrayal
24%inclusion163 decks680 decks
21%synergy
Lively Dirge
22%inclusion149 decks680 decks
21%synergy
Demonic Counsel
16%inclusion108 decks680 decks
15%synergy
Yawgmoth's Will
15%inclusion99 decks680 decks
13%synergy
Praetor's Grasp
11%inclusion72 decks680 decks
8%synergy
Diabolic Intent
10%inclusion69 decks680 decks
5%synergy
Cabal Therapy
10%inclusion68 decks680 decks
10%synergy
Unmarked Grave
10%inclusion68 decks680 decks
9%synergy
Utility Artifacts
The One Ring
85%inclusion575 decks680 decks
71%synergy
Wishclaw Talisman
70%inclusion478 decks680 decks
62%synergy
Cursed Totem
10%inclusion68 decks680 decks
8%synergy
Vexing Bauble
8.4%inclusion57 decks680 decks
7%synergy
Mesmeric Orb
7.4%inclusion50 decks680 decks
6%synergy
Sensei's Divining Top
5.9%inclusion40 decks680 decks
-4%synergy
Isochron Scepter
5.9%inclusion40 decks680 decks
4%synergy
Enchantments
Necropotence
71%inclusion483 decks680 decks
64%synergy
Tinybones Joins Up
63%inclusion428 decks680 decks
62%synergy
Blind Obedience
59%inclusion404 decks680 decks
47%synergy
Copy Artifact
52%inclusion355 decks680 decks
51%synergy
Amphibian Downpour
50%inclusion337 decks680 decks
45%synergy
Ripples of Undeath
47%inclusion321 decks680 decks
44%synergy
Touch the Spirit Realm
43%inclusion294 decks680 decks
41%synergy
Static Prison
37%inclusion252 decks680 decks
37%synergy
The Meathook Massacre
37%inclusion250 decks680 decks
33%synergy
Mirrormade
33%inclusion225 decks680 decks
23%synergy
Steal Enchantment
31%inclusion209 decks680 decks
30%synergy
Chains of Mephistopheles
22%inclusion148 decks680 decks
22%synergy
Trouble in Pairs
21%inclusion142 decks680 decks
15%synergy
Counterbalance
21%inclusion142 decks680 decks
19%synergy
Founding the Third Path
16%inclusion112 decks680 decks
16%synergy
Chthonian Nightmare
13%inclusion86 decks680 decks
12%synergy
Copy Enchantment
12%inclusion81 decks680 decks
7%synergy
Seal of Removal
8.8%inclusion60 decks680 decks
8%synergy
Power Artifact
7.1%inclusion48 decks680 decks
7%synergy
Seal of Cleansing
6.8%inclusion46 decks680 decks
5%synergy
Monologue Tax
6.8%inclusion46 decks680 decks
1%synergy
Aura of Silence
6.8%inclusion46 decks680 decks
4%synergy
Dance of Many
6.3%inclusion43 decks680 decks
6%synergy
Leyline of Anticipation
5.9%inclusion40 decks680 decks
1%synergy
Charitable Levy
5.6%inclusion38 decks680 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
53%inclusion361 decks680 decks
45%synergy
Utility Lands
Otawara, Soaring City
93%inclusion630 decks680 decks
73%synergy
Urza's Saga
44%inclusion299 decks680 decks
32%synergy
Minamo, School at Water's Edge
35%inclusion238 decks680 decks
31%synergy
Emergence Zone
30%inclusion205 decks680 decks
28%synergy
City of Traitors
29%inclusion197 decks680 decks
28%synergy
Serra's Sanctum
24%inclusion162 decks680 decks
22%synergy
Cephalid Coliseum
22%inclusion149 decks680 decks
18%synergy
Takenuma, Abandoned Mire
10%inclusion67 decks680 decks
3%synergy
Urborg, Tomb of Yawgmoth
7.8%inclusion53 decks680 decks
-5%synergy
Hall of Heliod's Generosity
5.7%inclusion39 decks680 decks
-7%synergy
Mana Artifacts
Sol Ring
100%inclusion678 decks680 decks
10%synergy
Arcane Signet
98%inclusion663 decks680 decks
10%synergy
Lotus Petal
96%inclusion653 decks680 decks
85%synergy
Mox Opal
86%inclusion586 decks680 decks
77%synergy
Lion's Eye Diamond
84%inclusion573 decks680 decks
82%synergy
Talisman of Dominance
84%inclusion572 decks680 decks
35%synergy
Fellwar Stone
79%inclusion538 decks680 decks
45%synergy
Grim Monolith
61%inclusion416 decks680 decks
58%synergy
Talisman of Progress
51%inclusion347 decks680 decks
8%synergy
Mox Amber
40%inclusion269 decks680 decks
33%synergy
Talisman of Hierarchy
31%inclusion211 decks680 decks
-13%synergy
Basalt Monolith
7.8%inclusion53 decks680 decks
6%synergy
Lands
Tundra
100%inclusion678 decks680 decks
84%synergy
Underground Sea
100%inclusion678 decks680 decks
84%synergy
Scrubland
100%inclusion678 decks680 decks
84%synergy
Watery Grave
99%inclusion674 decks680 decks
49%synergy
Polluted Delta
99%inclusion673 decks680 decks
61%synergy
Flooded Strand
98%inclusion669 decks680 decks
60%synergy
Command Tower
98%inclusion667 decks680 decks
6%synergy
Hallowed Fountain
98%inclusion667 decks680 decks
49%synergy
Marsh Flats
98%inclusion663 decks680 decks
61%synergy
Godless Shrine
94%inclusion640 decks680 decks
43%synergy
Mana Confluence
93%inclusion635 decks680 decks
79%synergy
Gemstone Caverns
93%inclusion633 decks680 decks
85%synergy
City of Brass
92%inclusion626 decks680 decks
77%synergy
Misty Rainforest
89%inclusion604 decks680 decks
78%synergy
Bloodstained Mire
86%inclusion583 decks680 decks
75%synergy
Verdant Catacombs
85%inclusion577 decks680 decks
75%synergy
Scalding Tarn
84%inclusion572 decks680 decks
73%synergy
Windswept Heath
73%inclusion498 decks680 decks
63%synergy
Exotic Orchard
68%inclusion464 decks680 decks
10%synergy
Arid Mesa
68%inclusion463 decks680 decks
58%synergy
Morphic Pool
63%inclusion429 decks680 decks
29%synergy
Undercity Sewers
58%inclusion392 decks680 decks
43%synergy
Sea of Clouds
50%inclusion339 decks680 decks
14%synergy
Vault of Champions
39%inclusion266 decks680 decks
6%synergy
Island
36%inclusion246 decks680 decks
-57%synergy
Starting Town
30%inclusion70 decks230 decks
26%synergy
Swamp
28%inclusion189 decks680 decks
-64%synergy
Sink into Stupor
25%inclusion168 decks680 decks
12%synergy
Meticulous Archive
24%inclusion161 decks680 decks
10%synergy
Forbidden Orchard
19%inclusion130 decks680 decks
17%synergy
Plains
19%inclusion127 decks680 decks
-73%synergy
Cavern of Souls
18%inclusion122 decks680 decks
11%synergy
Spire of Industry
18%inclusion120 decks680 decks
9%synergy
Shadowy Backstreet
16%inclusion108 decks680 decks
3%synergy
Talon Gates of Madara
13%inclusion90 decks680 decks
12%synergy
Underground River
8.5%inclusion58 decks680 decks
-25%synergy
Raffine's Tower
5.9%inclusion40 decks680 decks
-35%synergy
Silent Clearing
5.6%inclusion38 decks680 decks
3%synergy
Gloomlake Verge
5.3%inclusion36 decks680 decks
-6%synergy
Tarnished Citadel
5.1%inclusion35 decks680 decks
4%synergy
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