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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Exhibition Tidecaller
5.6%inclusion1 decks18 decks
5%synergy
Does Machines
4.5%inclusion4 decks88 decks
4%synergy
High Synergy Cards
Necromancy
96%inclusion719 decks752 decks
91%synergy
Intuition
93%inclusion696 decks752 decks
91%synergy
Abdel Adrian, Gorion's Ward
90%inclusion676 decks752 decks
88%synergy
Animate Dead
97%inclusion727 decks752 decks
87%synergy
Entomb
94%inclusion705 decks752 decks
87%synergy
Dance of the Dead
89%inclusion669 decks752 decks
87%synergy
Tainted Pact
93%inclusion700 decks752 decks
86%synergy
Dress Down
87%inclusion653 decks752 decks
85%synergy
Silence
93%inclusion701 decks752 decks
83%synergy
Orcish Bowmasters
93%inclusion703 decks752 decks
83%synergy
Top Cards
Mystic Remora
99%inclusion746 decks752 decks
79%synergy
Esper Sentinel
98%inclusion739 decks752 decks
71%synergy
Dark Ritual
95%inclusion717 decks752 decks
76%synergy
Smothering Tithe
95%inclusion711 decks752 decks
64%synergy
Swan Song
91%inclusion687 decks752 decks
72%synergy
Force of Negation
91%inclusion681 decks752 decks
79%synergy
Flusterstorm
90%inclusion680 decks752 decks
82%synergy
Mindbreak Trap
88%inclusion663 decks752 decks
81%synergy
Demonic Consultation
87%inclusion653 decks752 decks
79%synergy
Imperial Seal
86%inclusion648 decks752 decks
79%synergy
Game Changers
Rhystic Study
100%inclusion749 decks752 decks
69%synergy
Vampiric Tutor
99%inclusion744 decks752 decks
82%synergy
Demonic Tutor
99%inclusion743 decks752 decks
78%synergy
Mana Vault
98%inclusion738 decks752 decks
89%synergy
Force of Will
98%inclusion737 decks752 decks
86%synergy
Mox Diamond
98%inclusion737 decks752 decks
91%synergy
Ancient Tomb
97%inclusion731 decks752 decks
85%synergy
Enlightened Tutor
97%inclusion731 decks752 decks
78%synergy
Chrome Mox
97%inclusion731 decks752 decks
88%synergy
Thassa's Oracle
96%inclusion722 decks752 decks
87%synergy
Creatures
Grand Abolisher
85%inclusion640 decks752 decks
71%synergy
Ranger-Captain of Eos
84%inclusion634 decks752 decks
78%synergy
Lotho, Corrupt Shirriff
81%inclusion608 decks752 decks
64%synergy
Valley Floodcaller
75%inclusion563 decks752 decks
71%synergy
Wan Shi Tong, Librarian
60%inclusion85 decks142 decks
55%synergy
Opposition Agent
58%inclusion433 decks752 decks
49%synergy
Voice of Victory
57%inclusion204 decks355 decks
49%synergy
Displacer Kitten
53%inclusion402 decks752 decks
47%synergy
Hullbreaker Horror
49%inclusion371 decks752 decks
43%synergy
Auriok Salvagers
48%inclusion358 decks752 decks
47%synergy
Mockingbird
45%inclusion337 decks752 decks
40%synergy
Drannith Magistrate
44%inclusion330 decks752 decks
36%synergy
Archivist of Oghma
40%inclusion299 decks752 decks
33%synergy
Lurrus of the Dream-Den
36%inclusion270 decks752 decks
34%synergy
Tataru Taru
32%inclusion90 decks282 decks
24%synergy
Ledger Shredder
30%inclusion227 decks752 decks
21%synergy
Talion, the Kindly Lord
27%inclusion203 decks752 decks
19%synergy
Phyrexian Metamorph
25%inclusion188 decks752 decks
17%synergy
Faerie Mastermind
22%inclusion165 decks752 decks
12%synergy
Pollywog Prodigy
22%inclusion162 decks752 decks
18%synergy
Hedron Crab
20%inclusion152 decks752 decks
20%synergy
Psychic Frog
20%inclusion150 decks752 decks
13%synergy
Ghostly Pilferer
13%inclusion100 decks752 decks
6%synergy
Dauthi Voidwalker
13%inclusion96 decks752 decks
7%synergy
Gilded Drake
9.0%inclusion68 decks752 decks
7%synergy
Hoarding Broodlord
8.8%inclusion66 decks752 decks
7%synergy
High Fae Trickster
8.2%inclusion46 decks562 decks
4%synergy
Snapcaster Mage
8.1%inclusion61 decks752 decks
6%synergy
Leonin Relic-Warder
8.0%inclusion60 decks752 decks
8%synergy
Volatile Stormdrake
7.0%inclusion53 decks752 decks
6%synergy
Emet-Selch of the Third Seat
6.0%inclusion17 decks283 decks
-3%synergy
Overlord of the Balemurk
5.3%inclusion40 decks752 decks
3%synergy
Instants
Mental Misstep
86%inclusion644 decks752 decks
79%synergy
Pact of Negation
85%inclusion639 decks752 decks
77%synergy
Borne Upon a Wind
75%inclusion567 decks752 decks
71%synergy
Swords to Plowshares
75%inclusion564 decks752 decks
7%synergy
Fierce Guardianship
74%inclusion559 decks752 decks
54%synergy
Mystical Tutor
69%inclusion522 decks752 decks
59%synergy
Cabal Ritual
64%inclusion485 decks752 decks
61%synergy
Cyclonic Rift
58%inclusion438 decks752 decks
35%synergy
An Offer You Can't Refuse
58%inclusion433 decks752 decks
30%synergy
Chain of Vapor
47%inclusion355 decks752 decks
44%synergy
Mana Drain
36%inclusion269 decks752 decks
18%synergy
Into the Flood Maw
34%inclusion256 decks752 decks
30%synergy
Gifts Ungiven
29%inclusion221 decks752 decks
27%synergy
Ad Nauseam
25%inclusion190 decks752 decks
23%synergy
Sink into Stupor
24%inclusion182 decks752 decks
11%synergy
Culling the Weak
20%inclusion153 decks752 decks
19%synergy
Retraction Helix
19%inclusion142 decks752 decks
18%synergy
Brain Freeze
17%inclusion130 decks752 decks
17%synergy
Path to Exile
14%inclusion109 decks752 decks
-28%synergy
Darkblast
14%inclusion107 decks752 decks
14%synergy
Banishing Knack
12%inclusion87 decks752 decks
11%synergy
Dispel
8.9%inclusion67 decks752 decks
6%synergy
Deadly Rollick
7.8%inclusion59 decks752 decks
-7%synergy
Saw in Half
7.4%inclusion56 decks752 decks
5%synergy
Strix Serenade
6.9%inclusion52 decks752 decks
3%synergy
Orim's Chant
6.8%inclusion51 decks752 decks
5%synergy
Lim-Dûl's Vault
5.9%inclusion44 decks752 decks
3%synergy
Dramatic Reversal
5.9%inclusion44 decks752 decks
4%synergy
Sacrifice
5.5%inclusion41 decks752 decks
5%synergy
Rain of Filth
5.3%inclusion40 decks752 decks
5%synergy
Sorceries
Sevinne's Reclamation
72%inclusion541 decks752 decks
63%synergy
Reanimate
36%inclusion267 decks752 decks
19%synergy
Toxic Deluge
34%inclusion255 decks752 decks
14%synergy
Windfall
30%inclusion226 decks752 decks
17%synergy
Beseech the Mirror
26%inclusion199 decks752 decks
23%synergy
Mnemonic Betrayal
26%inclusion192 decks752 decks
23%synergy
Lively Dirge
22%inclusion163 decks752 decks
20%synergy
Demonic Counsel
15%inclusion116 decks752 decks
14%synergy
Yawgmoth's Will
13%inclusion101 decks752 decks
12%synergy
Cabal Therapy
11%inclusion83 decks752 decks
11%synergy
Praetor's Grasp
11%inclusion80 decks752 decks
8%synergy
Unmarked Grave
10%inclusion74 decks752 decks
8%synergy
Diabolic Intent
10%inclusion73 decks752 decks
5%synergy
Flash Photography
6.5%inclusion10 decks153 decks
6%synergy
Utility Artifacts
The One Ring
83%inclusion621 decks752 decks
70%synergy
Wishclaw Talisman
70%inclusion527 decks752 decks
62%synergy
Cursed Totem
10%inclusion72 decks752 decks
7%synergy
Vexing Bauble
8.0%inclusion60 decks752 decks
6%synergy
Mesmeric Orb
7.4%inclusion56 decks752 decks
6%synergy
Sensei's Divining Top
5.7%inclusion43 decks752 decks
-4%synergy
Isochron Scepter
5.5%inclusion41 decks752 decks
3%synergy
Enchantments
Necropotence
72%inclusion540 decks752 decks
65%synergy
Tinybones Joins Up
63%inclusion475 decks752 decks
62%synergy
Blind Obedience
60%inclusion449 decks752 decks
48%synergy
Copy Artifact
52%inclusion393 decks752 decks
51%synergy
Amphibian Downpour
49%inclusion370 decks752 decks
45%synergy
Ripples of Undeath
48%inclusion363 decks752 decks
46%synergy
Touch the Spirit Realm
43%inclusion321 decks752 decks
40%synergy
The Meathook Massacre
37%inclusion280 decks752 decks
34%synergy
Static Prison
36%inclusion269 decks752 decks
35%synergy
Mirrormade
34%inclusion255 decks752 decks
24%synergy
Steal Enchantment
31%inclusion231 decks752 decks
30%synergy
Chains of Mephistopheles
21%inclusion159 decks752 decks
21%synergy
Trouble in Pairs
20%inclusion153 decks752 decks
15%synergy
Counterbalance
20%inclusion149 decks752 decks
18%synergy
Founding the Third Path
17%inclusion130 decks752 decks
17%synergy
Copy Enchantment
13%inclusion100 decks752 decks
9%synergy
Chthonian Nightmare
12%inclusion91 decks752 decks
12%synergy
Seal of Removal
8.5%inclusion64 decks752 decks
8%synergy
Mornsong Aria
7.3%inclusion7 decks96 decks
7%synergy
Power Artifact
7.0%inclusion53 decks752 decks
7%synergy
Seal of Cleansing
6.9%inclusion52 decks752 decks
5%synergy
Leyline of Anticipation
6.8%inclusion51 decks752 decks
2%synergy
Monologue Tax
6.8%inclusion51 decks752 decks
0%synergy
Aura of Silence
6.8%inclusion51 decks752 decks
4%synergy
Dance of Many
5.9%inclusion44 decks752 decks
6%synergy
Charitable Levy
5.3%inclusion40 decks752 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
53%inclusion397 decks752 decks
45%synergy
Utility Lands
Otawara, Soaring City
93%inclusion697 decks752 decks
74%synergy
Urza's Saga
46%inclusion344 decks752 decks
34%synergy
Minamo, School at Water's Edge
37%inclusion275 decks752 decks
33%synergy
Emergence Zone
29%inclusion219 decks752 decks
27%synergy
City of Traitors
28%inclusion214 decks752 decks
27%synergy
Serra's Sanctum
24%inclusion177 decks752 decks
22%synergy
Cephalid Coliseum
22%inclusion165 decks752 decks
18%synergy
Takenuma, Abandoned Mire
10%inclusion74 decks752 decks
3%synergy
Urborg, Tomb of Yawgmoth
8.4%inclusion63 decks752 decks
-5%synergy
Hall of Heliod's Generosity
6.0%inclusion45 decks752 decks
-7%synergy
Phyrexian Tower
5.3%inclusion40 decks752 decks
2%synergy
Mana Artifacts
Sol Ring
100%inclusion750 decks752 decks
10%synergy
Arcane Signet
97%inclusion731 decks752 decks
9%synergy
Lotus Petal
96%inclusion721 decks752 decks
85%synergy
Mox Opal
87%inclusion651 decks752 decks
78%synergy
Lion's Eye Diamond
86%inclusion649 decks752 decks
84%synergy
Talisman of Dominance
83%inclusion624 decks752 decks
33%synergy
Fellwar Stone
80%inclusion600 decks752 decks
47%synergy
Grim Monolith
56%inclusion423 decks752 decks
53%synergy
Talisman of Progress
49%inclusion372 decks752 decks
6%synergy
Mox Amber
40%inclusion304 decks752 decks
34%synergy
Talisman of Hierarchy
31%inclusion231 decks752 decks
-13%synergy
Basalt Monolith
7.2%inclusion54 decks752 decks
5%synergy
Lands
Scrubland
100%inclusion750 decks752 decks
84%synergy
Tundra
100%inclusion749 decks752 decks
84%synergy
Underground Sea
99%inclusion748 decks752 decks
84%synergy
Watery Grave
99%inclusion746 decks752 decks
48%synergy
Polluted Delta
99%inclusion745 decks752 decks
61%synergy
Flooded Strand
98%inclusion740 decks752 decks
60%synergy
Command Tower
98%inclusion738 decks752 decks
6%synergy
Hallowed Fountain
98%inclusion738 decks752 decks
48%synergy
Marsh Flats
98%inclusion736 decks752 decks
62%synergy
Godless Shrine
95%inclusion712 decks752 decks
43%synergy
Mana Confluence
94%inclusion706 decks752 decks
80%synergy
Gemstone Caverns
93%inclusion702 decks752 decks
86%synergy
City of Brass
92%inclusion695 decks752 decks
77%synergy
Misty Rainforest
89%inclusion669 decks752 decks
78%synergy
Bloodstained Mire
85%inclusion642 decks752 decks
75%synergy
Verdant Catacombs
85%inclusion640 decks752 decks
75%synergy
Scalding Tarn
84%inclusion632 decks752 decks
73%synergy
Windswept Heath
72%inclusion545 decks752 decks
63%synergy
Arid Mesa
68%inclusion512 decks752 decks
59%synergy
Exotic Orchard
67%inclusion505 decks752 decks
8%synergy
Morphic Pool
65%inclusion486 decks752 decks
31%synergy
Undercity Sewers
57%inclusion429 decks752 decks
43%synergy
Sea of Clouds
51%inclusion383 decks752 decks
16%synergy
Vault of Champions
40%inclusion302 decks752 decks
8%synergy
Starting Town
36%inclusion103 decks283 decks
32%synergy
Island
34%inclusion255 decks752 decks
-59%synergy
Swamp
26%inclusion194 decks752 decks
-66%synergy
Sink into Stupor
24%inclusion182 decks752 decks
11%synergy
Meticulous Archive
23%inclusion170 decks752 decks
9%synergy
Forbidden Orchard
19%inclusion142 decks752 decks
17%synergy
Spire of Industry
18%inclusion134 decks752 decks
10%synergy
Plains
18%inclusion134 decks752 decks
-74%synergy
Cavern of Souls
17%inclusion130 decks752 decks
11%synergy
Shadowy Backstreet
16%inclusion117 decks752 decks
3%synergy
Talon Gates of Madara
12%inclusion93 decks752 decks
11%synergy
Underground River
7.6%inclusion57 decks752 decks
-26%synergy
Tarnished Citadel
5.5%inclusion41 decks752 decks
5%synergy
Raffine's Tower
5.5%inclusion41 decks752 decks
-35%synergy
Silent Clearing
5.5%inclusion41 decks752 decks
3%synergy
Gloomlake Verge
5.1%inclusion38 decks752 decks
-6%synergy
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