The Master of Keys (Commander) - Expensive Optimized

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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Abdel Adrian, Gorion's Ward
90%inclusion26 decks29 decks
88%synergy
Animate Dead
93%inclusion27 decks29 decks
84%synergy
Entomb
90%inclusion26 decks29 decks
83%synergy
Necromancy
86%inclusion25 decks29 decks
82%synergy
Dress Down
83%inclusion24 decks29 decks
80%synergy
Dance of the Dead
76%inclusion22 decks29 decks
74%synergy
Mystic Remora
93%inclusion27 decks29 decks
72%synergy
Tinybones Joins Up
72%inclusion21 decks29 decks
71%synergy
Intuition
72%inclusion21 decks29 decks
71%synergy
Orcish Bowmasters
79%inclusion23 decks29 decks
69%synergy
Top Cards
Esper Sentinel
90%inclusion26 decks29 decks
62%synergy
Dark Ritual
79%inclusion23 decks29 decks
60%synergy
Force of Will
76%inclusion22 decks29 decks
64%synergy
Swords to Plowshares
76%inclusion22 decks29 decks
8%synergy
Thassa's Oracle
76%inclusion22 decks29 decks
67%synergy
Valley Floodcaller
72%inclusion21 decks29 decks
68%synergy
Blind Obedience
72%inclusion21 decks29 decks
60%synergy
Lotho, Corrupt Shirriff
69%inclusion20 decks29 decks
52%synergy
Silence
69%inclusion20 decks29 decks
59%synergy
Imperial Seal
69%inclusion20 decks29 decks
62%synergy
Game Changers
Vampiric Tutor
100%inclusion29 decks29 decks
83%synergy
Enlightened Tutor
97%inclusion28 decks29 decks
77%synergy
Rhystic Study
97%inclusion28 decks29 decks
65%synergy
Smothering Tithe
93%inclusion27 decks29 decks
62%synergy
Ancient Tomb
93%inclusion27 decks29 decks
80%synergy
Demonic Tutor
93%inclusion27 decks29 decks
73%synergy
Chrome Mox
90%inclusion26 decks29 decks
80%synergy
Mox Diamond
86%inclusion25 decks29 decks
79%synergy
Mana Vault
86%inclusion25 decks29 decks
77%synergy
The One Ring
79%inclusion23 decks29 decks
66%synergy
Creatures
Grand Abolisher
62%inclusion18 decks29 decks
48%synergy
Ranger-Captain of Eos
55%inclusion16 decks29 decks
49%synergy
Wan Shi Tong, Librarian
55%inclusion6 decks11 decks
49%synergy
Opposition Agent
52%inclusion15 decks29 decks
43%synergy
Displacer Kitten
45%inclusion13 decks29 decks
38%synergy
Drannith Magistrate
45%inclusion13 decks29 decks
37%synergy
Auriok Salvagers
45%inclusion13 decks29 decks
45%synergy
Hullbreaker Horror
38%inclusion11 decks29 decks
32%synergy
Ledger Shredder
38%inclusion11 decks29 decks
29%synergy
Voice of Victory
36%inclusion8 decks22 decks
28%synergy
Lurrus of the Dream-Den
31%inclusion9 decks29 decks
30%synergy
Talion, the Kindly Lord
28%inclusion8 decks29 decks
20%synergy
Psychic Frog
28%inclusion8 decks29 decks
21%synergy
Archivist of Oghma
28%inclusion8 decks29 decks
21%synergy
Mockingbird
28%inclusion8 decks29 decks
23%synergy
Phyrexian Metamorph
21%inclusion6 decks29 decks
12%synergy
Inquisitive Glimmer
21%inclusion6 decks29 decks
13%synergy
Hedron Crab
21%inclusion6 decks29 decks
20%synergy
Victor, Valgavoth's Seneschal
21%inclusion6 decks29 decks
19%synergy
Scrabbling Skullcrab
17%inclusion5 decks29 decks
16%synergy
Starfield Mystic
17%inclusion5 decks29 decks
11%synergy
Overlord of the Balemurk
17%inclusion5 decks29 decks
15%synergy
Faerie Mastermind
17%inclusion5 decks29 decks
8%synergy
Entity Tracker
17%inclusion5 decks29 decks
11%synergy
Pollywog Prodigy
14%inclusion4 decks29 decks
10%synergy
Hoarding Broodlord
14%inclusion4 decks29 decks
12%synergy
Mesa Enchantress
14%inclusion4 decks29 decks
5%synergy
Heliod, the Radiant Dawn
14%inclusion4 decks29 decks
10%synergy
Leonin Relic-Warder
10%inclusion3 decks29 decks
10%synergy
Snapcaster Mage
10%inclusion3 decks29 decks
8%synergy
Fear of Impostors
10%inclusion3 decks29 decks
9%synergy
Grim Guardian
10%inclusion3 decks29 decks
8%synergy
Ondu Spiritdancer
10%inclusion3 decks29 decks
4%synergy
Ghostly Pilferer
10%inclusion3 decks29 decks
3%synergy
Tataru Taru
10%inclusion2 decks20 decks
2%synergy
Volatile Stormdrake
6.9%inclusion2 decks29 decks
6%synergy
Overlord of the Floodpits
6.9%inclusion2 decks29 decks
3%synergy
Demon of Fate's Design
6.9%inclusion2 decks29 decks
1%synergy
Tameshi, Reality Architect
6.9%inclusion2 decks29 decks
6%synergy
Emry, Lurker of the Loch
6.9%inclusion2 decks29 decks
2%synergy
Spirited Companion
6.9%inclusion2 decks29 decks
5%synergy
Aura Thief
6.9%inclusion2 decks29 decks
6%synergy
Zur the Enchanter
6.9%inclusion2 decks29 decks
2%synergy
Sheoldred, the Apocalypse
6.9%inclusion2 decks29 decks
-2%synergy
Moon-Blessed Cleric
6.9%inclusion2 decks29 decks
2%synergy
Enduring Tenacity
6.9%inclusion2 decks29 decks
-1%synergy
Enduring Curiosity
6.9%inclusion2 decks29 decks
-1%synergy
Zur, Eternal Schemer
6.9%inclusion2 decks29 decks
4%synergy
Emet-Selch of the Third Seat
5.0%inclusion1 decks20 decks
-4%synergy
Instants
Fierce Guardianship
66%inclusion19 decks29 decks
45%synergy
Flusterstorm
66%inclusion19 decks29 decks
58%synergy
Demonic Consultation
66%inclusion19 decks29 decks
58%synergy
Force of Negation
66%inclusion19 decks29 decks
54%synergy
Pact of Negation
66%inclusion19 decks29 decks
58%synergy
Mindbreak Trap
62%inclusion18 decks29 decks
55%synergy
Tainted Pact
62%inclusion18 decks29 decks
55%synergy
Mental Misstep
62%inclusion18 decks29 decks
55%synergy
Borne Upon a Wind
59%inclusion17 decks29 decks
54%synergy
Cabal Ritual
55%inclusion16 decks29 decks
52%synergy
Swan Song
52%inclusion15 decks29 decks
32%synergy
Cyclonic Rift
52%inclusion15 decks29 decks
28%synergy
Mystical Tutor
52%inclusion15 decks29 decks
41%synergy
Gifts Ungiven
41%inclusion12 decks29 decks
39%synergy
Mana Drain
41%inclusion12 decks29 decks
24%synergy
Into the Flood Maw
38%inclusion11 decks29 decks
34%synergy
An Offer You Can't Refuse
34%inclusion10 decks29 decks
7%synergy
Chain of Vapor
21%inclusion6 decks29 decks
18%synergy
Brain Freeze
21%inclusion6 decks29 decks
20%synergy
Retraction Helix
17%inclusion5 decks29 decks
17%synergy
Sink into Stupor
17%inclusion5 decks29 decks
4%synergy
Banishing Knack
14%inclusion4 decks29 decks
13%synergy
Path to Exile
14%inclusion4 decks29 decks
-29%synergy
Saw in Half
14%inclusion4 decks29 decks
12%synergy
Teferi's Protection
10%inclusion3 decks29 decks
-6%synergy
Culling the Weak
10%inclusion3 decks29 decks
9%synergy
Sacrifice
10%inclusion3 decks29 decks
10%synergy
Orim's Chant
10%inclusion3 decks29 decks
9%synergy
Ad Nauseam
10%inclusion3 decks29 decks
8%synergy
Counterspell
10%inclusion3 decks29 decks
-31%synergy
Deadly Rollick
6.9%inclusion2 decks29 decks
-8%synergy
Void Rend
6.9%inclusion2 decks29 decks
-28%synergy
Darkblast
6.9%inclusion2 decks29 decks
7%synergy
Snuff Out
6.9%inclusion2 decks29 decks
-2%synergy
Brainstorm
6.9%inclusion2 decks29 decks
-10%synergy
Lim-Dûl's Vault
6.9%inclusion2 decks29 decks
4%synergy
Sorceries
Sevinne's Reclamation
69%inclusion20 decks29 decks
60%synergy
Beseech the Mirror
31%inclusion9 decks29 decks
27%synergy
Toxic Deluge
31%inclusion9 decks29 decks
11%synergy
Cabal Therapy
24%inclusion7 decks29 decks
24%synergy
Lively Dirge
24%inclusion7 decks29 decks
23%synergy
Reanimate
24%inclusion7 decks29 decks
8%synergy
Replenish
21%inclusion6 decks29 decks
19%synergy
Mnemonic Betrayal
21%inclusion6 decks29 decks
18%synergy
Windfall
17%inclusion5 decks29 decks
4%synergy
Demonic Counsel
14%inclusion4 decks29 decks
13%synergy
Idyllic Tutor
10%inclusion3 decks29 decks
6%synergy
Grim Tutor
6.9%inclusion2 decks29 decks
3%synergy
Redress Fate
6.9%inclusion2 decks29 decks
1%synergy
Utility Artifacts
Wishclaw Talisman
55%inclusion16 decks29 decks
47%synergy
Mesmeric Orb
17%inclusion5 decks29 decks
16%synergy
Vexing Bauble
14%inclusion4 decks29 decks
12%synergy
Sensei's Divining Top
10%inclusion3 decks29 decks
1%synergy
Whip of Erebos
6.9%inclusion2 decks29 decks
5%synergy
Cursed Totem
6.9%inclusion2 decks29 decks
5%synergy
Altar of the Brood
6.9%inclusion2 decks29 decks
6%synergy
Codex Shredder
6.9%inclusion2 decks29 decks
7%synergy
Enchantments
Necropotence
66%inclusion19 decks29 decks
59%synergy
Ripples of Undeath
62%inclusion18 decks29 decks
59%synergy
Amphibian Downpour
55%inclusion16 decks29 decks
51%synergy
Copy Artifact
41%inclusion12 decks29 decks
40%synergy
The Meathook Massacre
38%inclusion11 decks29 decks
35%synergy
Steal Enchantment
31%inclusion9 decks29 decks
30%synergy
Chthonian Nightmare
28%inclusion8 decks29 decks
27%synergy
Static Prison
28%inclusion8 decks29 decks
27%synergy
Trouble in Pairs
24%inclusion7 decks29 decks
19%synergy
Counterbalance
21%inclusion6 decks29 decks
19%synergy
Touch the Spirit Realm
21%inclusion6 decks29 decks
18%synergy
Mirrormade
21%inclusion6 decks29 decks
11%synergy
Founding the Third Path
17%inclusion5 decks29 decks
17%synergy
Starfield of Nyx
17%inclusion5 decks29 decks
13%synergy
Bloodchief Ascension
17%inclusion5 decks29 decks
12%synergy
Chains of Mephistopheles
17%inclusion5 decks29 decks
17%synergy
Stillness in Motion
14%inclusion3 decks21 decks
14%synergy
Darksteel Mutation
14%inclusion4 decks29 decks
8%synergy
Cemetery Tampering
14%inclusion4 decks29 decks
13%synergy
Land Tax
14%inclusion4 decks29 decks
8%synergy
Sphere of Safety
10%inclusion3 decks29 decks
1%synergy
Secret Arcade // Dusty Parlor
10%inclusion3 decks29 decks
6%synergy
Ghostly Prison
10%inclusion3 decks29 decks
-12%synergy
Estrid's Invocation
10%inclusion3 decks29 decks
6%synergy
Copy Enchantment
10%inclusion3 decks29 decks
6%synergy
Leyline of Anticipation
10%inclusion3 decks29 decks
6%synergy
Enchanted Evening
10%inclusion3 decks29 decks
9%synergy
Teval's Judgment
9.1%inclusion2 decks22 decks
8%synergy
Shark Typhoon
6.9%inclusion2 decks29 decks
1%synergy
Greater Auramancy
6.9%inclusion2 decks29 decks
2%synergy
Aura of Silence
6.9%inclusion2 decks29 decks
4%synergy
The Cruelty of Gix
6.9%inclusion2 decks29 decks
7%synergy
Authority of the Consuls
6.9%inclusion2 decks29 decks
-6%synergy
Seal of Cleansing
6.9%inclusion2 decks29 decks
5%synergy
Monologue Tax
6.9%inclusion2 decks29 decks
1%synergy
Dovescape
6.9%inclusion2 decks29 decks
7%synergy
Propaganda
6.9%inclusion2 decks29 decks
-21%synergy
Solemnity
6.9%inclusion2 decks29 decks
4%synergy
Out of the Tombs
6.9%inclusion2 decks29 decks
6%synergy
Mind Over Matter
6.9%inclusion2 decks29 decks
7%synergy
Phyrexian Unlife
6.9%inclusion2 decks29 decks
5%synergy
Exquisite Blood
6.9%inclusion2 decks29 decks
0%synergy
Black Market Connections
6.9%inclusion2 decks29 decks
-8%synergy
Hallowed Haunting
6.9%inclusion2 decks29 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
45%inclusion13 decks29 decks
37%synergy
Tezzeret, Cruel Captain
6.3%inclusion1 decks16 decks
4%synergy
Utility Lands
Otawara, Soaring City
79%inclusion23 decks29 decks
60%synergy
Urza's Saga
41%inclusion12 decks29 decks
30%synergy
Serra's Sanctum
31%inclusion9 decks29 decks
29%synergy
Hall of Heliod's Generosity
28%inclusion8 decks29 decks
15%synergy
Emergence Zone
28%inclusion8 decks29 decks
26%synergy
Takenuma, Abandoned Mire
24%inclusion7 decks29 decks
18%synergy
Cephalid Coliseum
17%inclusion5 decks29 decks
14%synergy
Minamo, School at Water's Edge
17%inclusion5 decks29 decks
13%synergy
City of Traitors
10%inclusion3 decks29 decks
9%synergy
Urborg, Tomb of Yawgmoth
10%inclusion3 decks29 decks
-3%synergy
Uthros, Titanic Godcore
7.1%inclusion1 decks14 decks
4%synergy
Phyrexian Tower
6.9%inclusion2 decks29 decks
3%synergy
Reliquary Tower
6.9%inclusion2 decks29 decks
-27%synergy
Academy Ruins
6.9%inclusion2 decks29 decks
0%synergy
Mana Artifacts
Arcane Signet
97%inclusion28 decks29 decks
9%synergy
Sol Ring
93%inclusion27 decks29 decks
3%synergy
Lotus Petal
76%inclusion22 decks29 decks
65%synergy
Talisman of Dominance
69%inclusion20 decks29 decks
19%synergy
Fellwar Stone
66%inclusion19 decks29 decks
32%synergy
Lion's Eye Diamond
66%inclusion19 decks29 decks
63%synergy
Mox Opal
59%inclusion17 decks29 decks
50%synergy
Talisman of Hierarchy
45%inclusion13 decks29 decks
1%synergy
Talisman of Progress
38%inclusion11 decks29 decks
-6%synergy
Grim Monolith
31%inclusion9 decks29 decks
28%synergy
Mox Amber
24%inclusion7 decks29 decks
18%synergy
The Soul Stone
14%inclusion2 decks14 decks
12%synergy
Dimir Signet
6.9%inclusion2 decks29 decks
-24%synergy
Azorius Signet
6.9%inclusion2 decks29 decks
-24%synergy
Basalt Monolith
6.9%inclusion2 decks29 decks
5%synergy
Lands
Tundra
100%inclusion29 decks29 decks
84%synergy
Underground Sea
100%inclusion29 decks29 decks
84%synergy
Command Tower
100%inclusion29 decks29 decks
7%synergy
Scrubland
100%inclusion29 decks29 decks
84%synergy
Marsh Flats
97%inclusion28 decks29 decks
61%synergy
Watery Grave
97%inclusion28 decks29 decks
46%synergy
Polluted Delta
93%inclusion27 decks29 decks
55%synergy
Godless Shrine
90%inclusion26 decks29 decks
38%synergy
Flooded Strand
90%inclusion26 decks29 decks
51%synergy
Hallowed Fountain
90%inclusion26 decks29 decks
39%synergy
Bloodstained Mire
83%inclusion24 decks29 decks
72%synergy
Undercity Sewers
76%inclusion22 decks29 decks
61%synergy
Verdant Catacombs
76%inclusion22 decks29 decks
66%synergy
Misty Rainforest
72%inclusion21 decks29 decks
62%synergy
Mana Confluence
72%inclusion21 decks29 decks
59%synergy
City of Brass
72%inclusion21 decks29 decks
57%synergy
Arid Mesa
69%inclusion20 decks29 decks
59%synergy
Gemstone Caverns
69%inclusion20 decks29 decks
61%synergy
Windswept Heath
66%inclusion19 decks29 decks
56%synergy
Morphic Pool
62%inclusion18 decks29 decks
28%synergy
Scalding Tarn
59%inclusion17 decks29 decks
48%synergy
Vault of Champions
55%inclusion16 decks29 decks
23%synergy
Island
52%inclusion15 decks29 decks
-41%synergy
Sea of Clouds
52%inclusion15 decks29 decks
17%synergy
Exotic Orchard
48%inclusion14 decks29 decks
-10%synergy
Shadowy Backstreet
45%inclusion13 decks29 decks
32%synergy
Swamp
41%inclusion12 decks29 decks
-50%synergy
Meticulous Archive
41%inclusion12 decks29 decks
28%synergy
Plains
34%inclusion10 decks29 decks
-57%synergy
Raffine's Tower
34%inclusion10 decks29 decks
-6%synergy
Forbidden Orchard
24%inclusion7 decks29 decks
22%synergy
Cavern of Souls
17%inclusion5 decks29 decks
11%synergy
Sink into Stupor
17%inclusion5 decks29 decks
4%synergy
Starting Town
15%inclusion3 decks20 decks
11%synergy
Snow-Covered Swamp
14%inclusion4 decks29 decks
11%synergy
Bleachbone Verge
11%inclusion3 decks28 decks
2%synergy
Underground River
10%inclusion3 decks29 decks
-24%synergy
Snow-Covered Plains
10%inclusion3 decks29 decks
8%synergy
Caves of Koilos
10%inclusion3 decks29 decks
-25%synergy
Valgavoth's Lair
10%inclusion3 decks29 decks
8%synergy
Spire of Industry
10%inclusion3 decks29 decks
2%synergy
Floodfarm Verge
10%inclusion3 decks29 decks
-1%synergy
Brightclimb Pathway
6.9%inclusion2 decks29 decks
0%synergy
Snow-Covered Island
6.9%inclusion2 decks29 decks
4%synergy
Glacial Fortress
6.9%inclusion2 decks29 decks
-35%synergy
Fabled Passage
6.9%inclusion2 decks29 decks
-1%synergy
Adarkar Wastes
6.9%inclusion2 decks29 decks
-25%synergy
Gloomlake Verge
6.9%inclusion2 decks29 decks
-4%synergy
Reflecting Pool
6.9%inclusion2 decks29 decks
-1%synergy
Arcane Sanctum
6.9%inclusion2 decks29 decks
-47%synergy
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