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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Mana Artifacts
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Abdel Adrian, Gorion's Ward
88%inclusion23 decks26 decks
87%synergy
Necromancy
88%inclusion23 decks26 decks
84%synergy
Animate Dead
92%inclusion24 decks26 decks
83%synergy
Entomb
88%inclusion23 decks26 decks
82%synergy
Dress Down
81%inclusion21 decks26 decks
78%synergy
Dance of the Dead
77%inclusion20 decks26 decks
75%synergy
Mystic Remora
92%inclusion24 decks26 decks
71%synergy
Intuition
69%inclusion18 decks26 decks
68%synergy
Orcish Bowmasters
77%inclusion20 decks26 decks
66%synergy
Valley Floodcaller
69%inclusion18 decks26 decks
65%synergy
Top Cards
Esper Sentinel
88%inclusion23 decks26 decks
61%synergy
Dark Ritual
81%inclusion21 decks26 decks
61%synergy
Thassa's Oracle
73%inclusion19 decks26 decks
64%synergy
Blind Obedience
73%inclusion19 decks26 decks
61%synergy
Force of Will
73%inclusion19 decks26 decks
60%synergy
Imperial Seal
69%inclusion18 decks26 decks
62%synergy
Swords to Plowshares
69%inclusion18 decks26 decks
1%synergy
Tinybones Joins Up
65%inclusion17 decks26 decks
64%synergy
Ripples of Undeath
65%inclusion17 decks26 decks
63%synergy
Fierce Guardianship
65%inclusion17 decks26 decks
45%synergy
Game Changers
Vampiric Tutor
100%inclusion26 decks26 decks
82%synergy
Rhystic Study
96%inclusion25 decks26 decks
64%synergy
Enlightened Tutor
96%inclusion25 decks26 decks
76%synergy
Demonic Tutor
92%inclusion24 decks26 decks
71%synergy
Smothering Tithe
88%inclusion23 decks26 decks
57%synergy
Ancient Tomb
88%inclusion23 decks26 decks
75%synergy
Chrome Mox
88%inclusion23 decks26 decks
79%synergy
Mana Vault
85%inclusion22 decks26 decks
75%synergy
Mox Diamond
85%inclusion22 decks26 decks
77%synergy
The One Ring
81%inclusion21 decks26 decks
67%synergy
Creatures
Lotho, Corrupt Shirriff
62%inclusion16 decks26 decks
45%synergy
Grand Abolisher
58%inclusion15 decks26 decks
43%synergy
Displacer Kitten
50%inclusion13 decks26 decks
43%synergy
Ranger-Captain of Eos
50%inclusion13 decks26 decks
44%synergy
Opposition Agent
50%inclusion13 decks26 decks
41%synergy
Hullbreaker Horror
46%inclusion12 decks26 decks
40%synergy
Auriok Salvagers
46%inclusion12 decks26 decks
46%synergy
Drannith Magistrate
42%inclusion11 decks26 decks
34%synergy
Ledger Shredder
42%inclusion11 decks26 decks
33%synergy
Lurrus of the Dream-Den
38%inclusion10 decks26 decks
37%synergy
Psychic Frog
35%inclusion9 decks26 decks
28%synergy
Archivist of Oghma
27%inclusion7 decks26 decks
20%synergy
Talion, the Kindly Lord
27%inclusion7 decks26 decks
19%synergy
Victor, Valgavoth's Seneschal
23%inclusion6 decks26 decks
21%synergy
Starfield Mystic
23%inclusion6 decks26 decks
16%synergy
Inquisitive Glimmer
23%inclusion6 decks26 decks
16%synergy
Voice of Victory
22%inclusion4 decks18 decks
14%synergy
Wan Shi Tong, Librarian
20%inclusion1 decks5 decks
15%synergy
Mockingbird
19%inclusion5 decks26 decks
15%synergy
Entity Tracker
19%inclusion5 decks26 decks
13%synergy
Phyrexian Metamorph
19%inclusion5 decks26 decks
11%synergy
Hoarding Broodlord
15%inclusion4 decks26 decks
14%synergy
Overlord of the Balemurk
15%inclusion4 decks26 decks
13%synergy
Mesa Enchantress
15%inclusion4 decks26 decks
6%synergy
Pollywog Prodigy
15%inclusion4 decks26 decks
11%synergy
Heliod, the Radiant Dawn
15%inclusion4 decks26 decks
12%synergy
Hedron Crab
15%inclusion4 decks26 decks
15%synergy
Leonin Relic-Warder
15%inclusion4 decks26 decks
15%synergy
Snapcaster Mage
12%inclusion3 decks26 decks
10%synergy
Fear of Impostors
12%inclusion3 decks26 decks
10%synergy
Ondu Spiritdancer
12%inclusion3 decks26 decks
5%synergy
Scrabbling Skullcrab
12%inclusion3 decks26 decks
11%synergy
Grim Guardian
12%inclusion3 decks26 decks
9%synergy
Moon-Blessed Cleric
7.7%inclusion2 decks26 decks
3%synergy
Enduring Tenacity
7.7%inclusion2 decks26 decks
0%synergy
Zur, Eternal Schemer
7.7%inclusion2 decks26 decks
4%synergy
Ghostly Pilferer
7.7%inclusion2 decks26 decks
0%synergy
Volatile Stormdrake
7.7%inclusion2 decks26 decks
6%synergy
Gravebreaker Lamia
7.7%inclusion2 decks26 decks
7%synergy
Overlord of the Floodpits
7.7%inclusion2 decks26 decks
4%synergy
Sheoldred, the Apocalypse
7.7%inclusion2 decks26 decks
-1%synergy
Spirited Companion
7.7%inclusion2 decks26 decks
6%synergy
Faerie Mastermind
7.7%inclusion2 decks26 decks
-2%synergy
Tameshi, Reality Architect
7.7%inclusion2 decks26 decks
7%synergy
Aura Thief
7.7%inclusion2 decks26 decks
7%synergy
Dauthi Voidwalker
7.7%inclusion2 decks26 decks
2%synergy
Demon of Fate's Design
7.7%inclusion2 decks26 decks
2%synergy
Enduring Curiosity
7.7%inclusion2 decks26 decks
0%synergy
Zur the Enchanter
7.7%inclusion2 decks26 decks
2%synergy
Emry, Lurker of the Loch
7.7%inclusion2 decks26 decks
2%synergy
Instants
Silence
62%inclusion16 decks26 decks
51%synergy
Cyclonic Rift
62%inclusion16 decks26 decks
37%synergy
Pact of Negation
62%inclusion16 decks26 decks
54%synergy
Demonic Consultation
58%inclusion15 decks26 decks
49%synergy
Force of Negation
58%inclusion15 decks26 decks
46%synergy
Mental Misstep
58%inclusion15 decks26 decks
51%synergy
Flusterstorm
58%inclusion15 decks26 decks
49%synergy
Borne Upon a Wind
54%inclusion14 decks26 decks
49%synergy
Mindbreak Trap
54%inclusion14 decks26 decks
47%synergy
Tainted Pact
54%inclusion14 decks26 decks
47%synergy
Mystical Tutor
50%inclusion13 decks26 decks
39%synergy
Cabal Ritual
50%inclusion13 decks26 decks
47%synergy
Swan Song
46%inclusion12 decks26 decks
27%synergy
An Offer You Can't Refuse
42%inclusion11 decks26 decks
15%synergy
Mana Drain
42%inclusion11 decks26 decks
25%synergy
Gifts Ungiven
35%inclusion9 decks26 decks
32%synergy
Into the Flood Maw
31%inclusion8 decks26 decks
27%synergy
Chain of Vapor
27%inclusion7 decks26 decks
24%synergy
Path to Exile
23%inclusion6 decks26 decks
-19%synergy
Sink into Stupor
23%inclusion6 decks26 decks
10%synergy
Brain Freeze
19%inclusion5 decks26 decks
19%synergy
Retraction Helix
19%inclusion5 decks26 decks
18%synergy
Saw in Half
15%inclusion4 decks26 decks
13%synergy
Banishing Knack
15%inclusion4 decks26 decks
15%synergy
Teferi's Protection
12%inclusion3 decks26 decks
-5%synergy
Counterspell
12%inclusion3 decks26 decks
-30%synergy
Sacrifice
12%inclusion3 decks26 decks
11%synergy
Deadly Rollick
7.7%inclusion2 decks26 decks
-7%synergy
Void Rend
7.7%inclusion2 decks26 decks
-26%synergy
Fell the Profane
7.7%inclusion2 decks26 decks
-1%synergy
Snuff Out
7.7%inclusion2 decks26 decks
-1%synergy
Culling the Weak
7.7%inclusion2 decks26 decks
6%synergy
Sorceries
Sevinne's Reclamation
65%inclusion17 decks26 decks
56%synergy
Toxic Deluge
31%inclusion8 decks26 decks
11%synergy
Beseech the Mirror
27%inclusion7 decks26 decks
23%synergy
Lively Dirge
23%inclusion6 decks26 decks
22%synergy
Reanimate
23%inclusion6 decks26 decks
7%synergy
Replenish
19%inclusion5 decks26 decks
17%synergy
Cabal Therapy
19%inclusion5 decks26 decks
19%synergy
Windfall
15%inclusion4 decks26 decks
2%synergy
Mnemonic Betrayal
12%inclusion3 decks26 decks
9%synergy
Idyllic Tutor
12%inclusion3 decks26 decks
7%synergy
Demonic Counsel
12%inclusion3 decks26 decks
10%synergy
Damn
7.7%inclusion2 decks26 decks
-13%synergy
Redress Fate
7.7%inclusion2 decks26 decks
2%synergy
Grim Tutor
7.7%inclusion2 decks26 decks
4%synergy
Utility Artifacts
Wishclaw Talisman
54%inclusion14 decks26 decks
46%synergy
Mesmeric Orb
19%inclusion5 decks26 decks
18%synergy
Vexing Bauble
15%inclusion4 decks26 decks
14%synergy
Sensei's Divining Top
15%inclusion4 decks26 decks
6%synergy
Whip of Erebos
7.7%inclusion2 decks26 decks
5%synergy
Codex Shredder
7.7%inclusion2 decks26 decks
7%synergy
Altar of the Brood
7.7%inclusion2 decks26 decks
6%synergy
Enchantments
Necropotence
54%inclusion14 decks26 decks
47%synergy
Amphibian Downpour
46%inclusion12 decks26 decks
42%synergy
Copy Artifact
42%inclusion11 decks26 decks
41%synergy
The Meathook Massacre
35%inclusion9 decks26 decks
31%synergy
Steal Enchantment
35%inclusion9 decks26 decks
34%synergy
Chthonian Nightmare
31%inclusion8 decks26 decks
30%synergy
Static Prison
27%inclusion7 decks26 decks
26%synergy
Trouble in Pairs
27%inclusion7 decks26 decks
21%synergy
Counterbalance
27%inclusion7 decks26 decks
25%synergy
Bloodchief Ascension
23%inclusion6 decks26 decks
18%synergy
Touch the Spirit Realm
23%inclusion6 decks26 decks
21%synergy
Starfield of Nyx
19%inclusion5 decks26 decks
15%synergy
Stillness in Motion
18%inclusion3 decks17 decks
17%synergy
Darksteel Mutation
15%inclusion4 decks26 decks
9%synergy
Land Tax
15%inclusion4 decks26 decks
9%synergy
Chains of Mephistopheles
15%inclusion4 decks26 decks
15%synergy
Mirrormade
15%inclusion4 decks26 decks
6%synergy
Cemetery Tampering
15%inclusion4 decks26 decks
15%synergy
Secret Arcade // Dusty Parlor
12%inclusion3 decks26 decks
7%synergy
Founding the Third Path
12%inclusion3 decks26 decks
11%synergy
Sphere of Safety
12%inclusion3 decks26 decks
2%synergy
Leyline of Anticipation
12%inclusion3 decks26 decks
7%synergy
Enchanted Evening
12%inclusion3 decks26 decks
10%synergy
Ghostly Prison
12%inclusion3 decks26 decks
-10%synergy
Estrid's Invocation
12%inclusion3 decks26 decks
7%synergy
Teval's Judgment
11%inclusion2 decks18 decks
10%synergy
Authority of the Consuls
7.7%inclusion2 decks26 decks
-4%synergy
Mind Over Matter
7.7%inclusion2 decks26 decks
7%synergy
Sheltered by Ghosts
7.7%inclusion2 decks26 decks
5%synergy
Dovescape
7.7%inclusion2 decks26 decks
7%synergy
Greater Auramancy
7.7%inclusion2 decks26 decks
3%synergy
Aura of Silence
7.7%inclusion2 decks26 decks
4%synergy
Solemnity
7.7%inclusion2 decks26 decks
4%synergy
Phyrexian Unlife
7.7%inclusion2 decks26 decks
6%synergy
Monologue Tax
7.7%inclusion2 decks26 decks
1%synergy
Hallowed Haunting
7.7%inclusion2 decks26 decks
5%synergy
The Cruelty of Gix
7.7%inclusion2 decks26 decks
7%synergy
Out of the Tombs
7.7%inclusion2 decks26 decks
7%synergy
Shark Typhoon
7.7%inclusion2 decks26 decks
2%synergy
Exquisite Blood
7.7%inclusion2 decks26 decks
1%synergy
Propaganda
7.7%inclusion2 decks26 decks
-20%synergy
Planeswalkers
Teferi, Time Raveler
50%inclusion13 decks26 decks
42%synergy
Tezzeret, Cruel Captain
9.1%inclusion1 decks11 decks
7%synergy
Utility Lands
Otawara, Soaring City
77%inclusion20 decks26 decks
58%synergy
Urza's Saga
46%inclusion12 decks26 decks
34%synergy
Takenuma, Abandoned Mire
31%inclusion8 decks26 decks
24%synergy
Serra's Sanctum
31%inclusion8 decks26 decks
29%synergy
Hall of Heliod's Generosity
27%inclusion7 decks26 decks
14%synergy
Emergence Zone
27%inclusion7 decks26 decks
25%synergy
Minamo, School at Water's Edge
19%inclusion5 decks26 decks
15%synergy
Cephalid Coliseum
19%inclusion5 decks26 decks
16%synergy
Urborg, Tomb of Yawgmoth
12%inclusion3 decks26 decks
-2%synergy
Uthros, Titanic Godcore
11%inclusion1 decks9 decks
8%synergy
Academy Ruins
7.7%inclusion2 decks26 decks
1%synergy
Reliquary Tower
7.7%inclusion2 decks26 decks
-26%synergy
Mistrise Village
5.6%inclusion1 decks18 decks
2%synergy
Mana Artifacts
Arcane Signet
96%inclusion25 decks26 decks
8%synergy
Sol Ring
92%inclusion24 decks26 decks
2%synergy
Lotus Petal
77%inclusion20 decks26 decks
66%synergy
Talisman of Dominance
69%inclusion18 decks26 decks
20%synergy
Fellwar Stone
65%inclusion17 decks26 decks
32%synergy
Mox Opal
62%inclusion16 decks26 decks
53%synergy
Lion's Eye Diamond
62%inclusion16 decks26 decks
59%synergy
Talisman of Hierarchy
46%inclusion12 decks26 decks
2%synergy
Talisman of Progress
38%inclusion10 decks26 decks
-5%synergy
Grim Monolith
35%inclusion9 decks26 decks
31%synergy
The Soul Stone
22%inclusion2 decks9 decks
19%synergy
Mox Amber
19%inclusion5 decks26 decks
13%synergy
Basalt Monolith
7.7%inclusion2 decks26 decks
5%synergy
Azorius Signet
7.7%inclusion2 decks26 decks
-24%synergy
Dimir Signet
7.7%inclusion2 decks26 decks
-24%synergy
Lands
Tundra
100%inclusion26 decks26 decks
84%synergy
Underground Sea
100%inclusion26 decks26 decks
84%synergy
Scrubland
100%inclusion26 decks26 decks
84%synergy
Watery Grave
100%inclusion26 decks26 decks
50%synergy
Command Tower
100%inclusion26 decks26 decks
7%synergy
Marsh Flats
96%inclusion25 decks26 decks
60%synergy
Polluted Delta
92%inclusion24 decks26 decks
55%synergy
Godless Shrine
92%inclusion24 decks26 decks
42%synergy
Hallowed Fountain
92%inclusion24 decks26 decks
43%synergy
Flooded Strand
88%inclusion23 decks26 decks
50%synergy
Bloodstained Mire
81%inclusion21 decks26 decks
70%synergy
Verdant Catacombs
73%inclusion19 decks26 decks
63%synergy
Undercity Sewers
73%inclusion19 decks26 decks
59%synergy
Misty Rainforest
69%inclusion18 decks26 decks
58%synergy
Gemstone Caverns
65%inclusion17 decks26 decks
58%synergy
City of Brass
65%inclusion17 decks26 decks
50%synergy
Arid Mesa
65%inclusion17 decks26 decks
56%synergy
Mana Confluence
65%inclusion17 decks26 decks
52%synergy
Windswept Heath
62%inclusion16 decks26 decks
52%synergy
Vault of Champions
58%inclusion15 decks26 decks
25%synergy
Exotic Orchard
58%inclusion15 decks26 decks
-1%synergy
Morphic Pool
58%inclusion15 decks26 decks
24%synergy
Scalding Tarn
54%inclusion14 decks26 decks
43%synergy
Sea of Clouds
54%inclusion14 decks26 decks
18%synergy
Island
50%inclusion13 decks26 decks
-43%synergy
Swamp
42%inclusion11 decks26 decks
-49%synergy
Shadowy Backstreet
38%inclusion10 decks26 decks
26%synergy
Plains
38%inclusion10 decks26 decks
-53%synergy
Meticulous Archive
38%inclusion10 decks26 decks
25%synergy
Raffine's Tower
35%inclusion9 decks26 decks
-6%synergy
Sink into Stupor
23%inclusion6 decks26 decks
10%synergy
Snow-Covered Swamp
19%inclusion5 decks26 decks
16%synergy
Forbidden Orchard
19%inclusion5 decks26 decks
17%synergy
Snow-Covered Plains
15%inclusion4 decks26 decks
12%synergy
Bleachbone Verge
12%inclusion3 decks25 decks
3%synergy
Caves of Koilos
12%inclusion3 decks26 decks
-24%synergy
Spire of Industry
12%inclusion3 decks26 decks
3%synergy
Floodfarm Verge
12%inclusion3 decks26 decks
0%synergy
Snow-Covered Island
12%inclusion3 decks26 decks
8%synergy
Cavern of Souls
12%inclusion3 decks26 decks
5%synergy
Valgavoth's Lair
12%inclusion3 decks26 decks
9%synergy
Underground River
12%inclusion3 decks26 decks
-22%synergy
Brightclimb Pathway
7.7%inclusion2 decks26 decks
1%synergy
Glacial Fortress
7.7%inclusion2 decks26 decks
-33%synergy
Fell the Profane
7.7%inclusion2 decks26 decks
-1%synergy
Reflecting Pool
7.7%inclusion2 decks26 decks
0%synergy
Arcane Sanctum
7.7%inclusion2 decks26 decks
-47%synergy
Isolated Chapel
7.7%inclusion2 decks26 decks
-32%synergy
Fabled Passage
7.7%inclusion2 decks26 decks
0%synergy
Adarkar Wastes
7.7%inclusion2 decks26 decks
-24%synergy
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