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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Wan Shi Tong, Librarian
25%inclusion1 decks4 decks
20%synergy
High Synergy Cards
Abdel Adrian, Gorion's Ward
92%inclusion23 decks25 decks
90%synergy
Necromancy
92%inclusion23 decks25 decks
87%synergy
Animate Dead
96%inclusion24 decks25 decks
86%synergy
Entomb
92%inclusion23 decks25 decks
85%synergy
Dance of the Dead
84%inclusion21 decks25 decks
82%synergy
Dress Down
84%inclusion21 decks25 decks
82%synergy
Mystic Remora
96%inclusion24 decks25 decks
75%synergy
Intuition
72%inclusion18 decks25 decks
70%synergy
Imperial Seal
76%inclusion19 decks25 decks
68%synergy
Blind Obedience
80%inclusion20 decks25 decks
68%synergy
Top Cards
Esper Sentinel
84%inclusion21 decks25 decks
56%synergy
Dark Ritual
80%inclusion20 decks25 decks
61%synergy
Thassa's Oracle
76%inclusion19 decks25 decks
66%synergy
Force of Will
76%inclusion19 decks25 decks
63%synergy
Orcish Bowmasters
76%inclusion19 decks25 decks
65%synergy
Swords to Plowshares
72%inclusion18 decks25 decks
4%synergy
Sevinne's Reclamation
72%inclusion18 decks25 decks
63%synergy
Ripples of Undeath
68%inclusion17 decks25 decks
65%synergy
Cyclonic Rift
68%inclusion17 decks25 decks
43%synergy
Pact of Negation
68%inclusion17 decks25 decks
60%synergy
Game Changers
Vampiric Tutor
100%inclusion25 decks25 decks
82%synergy
Rhystic Study
96%inclusion24 decks25 decks
64%synergy
Demonic Tutor
96%inclusion24 decks25 decks
75%synergy
Enlightened Tutor
96%inclusion24 decks25 decks
76%synergy
Ancient Tomb
92%inclusion23 decks25 decks
79%synergy
Chrome Mox
92%inclusion23 decks25 decks
82%synergy
Mana Vault
88%inclusion22 decks25 decks
79%synergy
Mox Diamond
88%inclusion22 decks25 decks
81%synergy
The One Ring
84%inclusion21 decks25 decks
70%synergy
Smothering Tithe
84%inclusion21 decks25 decks
52%synergy
Creatures
Valley Floodcaller
68%inclusion17 decks25 decks
64%synergy
Grand Abolisher
60%inclusion15 decks25 decks
45%synergy
Lotho, Corrupt Shirriff
60%inclusion15 decks25 decks
43%synergy
Opposition Agent
52%inclusion13 decks25 decks
43%synergy
Auriok Salvagers
52%inclusion13 decks25 decks
52%synergy
Ranger-Captain of Eos
52%inclusion13 decks25 decks
45%synergy
Displacer Kitten
48%inclusion12 decks25 decks
41%synergy
Hullbreaker Horror
44%inclusion11 decks25 decks
38%synergy
Drannith Magistrate
40%inclusion10 decks25 decks
32%synergy
Ledger Shredder
40%inclusion10 decks25 decks
31%synergy
Psychic Frog
36%inclusion9 decks25 decks
29%synergy
Lurrus of the Dream-Den
36%inclusion9 decks25 decks
34%synergy
Talion, the Kindly Lord
28%inclusion7 decks25 decks
20%synergy
Victor, Valgavoth's Seneschal
24%inclusion6 decks25 decks
22%synergy
Entity Tracker
24%inclusion6 decks25 decks
18%synergy
Archivist of Oghma
24%inclusion6 decks25 decks
17%synergy
Voice of Victory
24%inclusion4 decks17 decks
15%synergy
Phyrexian Metamorph
20%inclusion5 decks25 decks
11%synergy
Inquisitive Glimmer
20%inclusion5 decks25 decks
12%synergy
Starfield Mystic
20%inclusion5 decks25 decks
13%synergy
Overlord of the Balemurk
20%inclusion5 decks25 decks
18%synergy
Mockingbird
20%inclusion5 decks25 decks
16%synergy
Scrabbling Skullcrab
16%inclusion4 decks25 decks
15%synergy
Hedron Crab
16%inclusion4 decks25 decks
15%synergy
Pollywog Prodigy
16%inclusion4 decks25 decks
12%synergy
Grim Guardian
16%inclusion4 decks25 decks
13%synergy
Heliod, the Radiant Dawn
16%inclusion4 decks25 decks
12%synergy
Leonin Relic-Warder
12%inclusion3 decks25 decks
12%synergy
Hoarding Broodlord
12%inclusion3 decks25 decks
10%synergy
Fear of Impostors
12%inclusion3 decks25 decks
10%synergy
Mesa Enchantress
12%inclusion3 decks25 decks
3%synergy
Snapcaster Mage
12%inclusion3 decks25 decks
10%synergy
Volatile Stormdrake
8.0%inclusion2 decks25 decks
7%synergy
Ghostly Dancers
8.0%inclusion2 decks25 decks
5%synergy
Emry, Lurker of the Loch
8.0%inclusion2 decks25 decks
2%synergy
Enduring Tenacity
8.0%inclusion2 decks25 decks
1%synergy
Enduring Curiosity
8.0%inclusion2 decks25 decks
0%synergy
Gremlin Tamer
8.0%inclusion2 decks25 decks
7%synergy
Zur, Eternal Schemer
8.0%inclusion2 decks25 decks
5%synergy
Ondu Spiritdancer
8.0%inclusion2 decks25 decks
2%synergy
Dauthi Voidwalker
8.0%inclusion2 decks25 decks
2%synergy
Ghostly Pilferer
8.0%inclusion2 decks25 decks
1%synergy
Gravebreaker Lamia
8.0%inclusion2 decks25 decks
7%synergy
Faerie Mastermind
8.0%inclusion2 decks25 decks
-2%synergy
Tameshi, Reality Architect
8.0%inclusion2 decks25 decks
7%synergy
Instants
Fierce Guardianship
68%inclusion17 decks25 decks
47%synergy
Flusterstorm
60%inclusion15 decks25 decks
52%synergy
Mindbreak Trap
60%inclusion15 decks25 decks
53%synergy
Silence
60%inclusion15 decks25 decks
50%synergy
Force of Negation
60%inclusion15 decks25 decks
48%synergy
Tainted Pact
56%inclusion14 decks25 decks
48%synergy
Demonic Consultation
56%inclusion14 decks25 decks
48%synergy
Mental Misstep
56%inclusion14 decks25 decks
49%synergy
Borne Upon a Wind
56%inclusion14 decks25 decks
51%synergy
Swan Song
52%inclusion13 decks25 decks
32%synergy
Cabal Ritual
48%inclusion12 decks25 decks
45%synergy
Mystical Tutor
48%inclusion12 decks25 decks
36%synergy
Mana Drain
44%inclusion11 decks25 decks
27%synergy
An Offer You Can't Refuse
40%inclusion10 decks25 decks
13%synergy
Gifts Ungiven
32%inclusion8 decks25 decks
30%synergy
Into the Flood Maw
32%inclusion8 decks25 decks
28%synergy
Sink into Stupor
24%inclusion6 decks25 decks
11%synergy
Chain of Vapor
24%inclusion6 decks25 decks
21%synergy
Path to Exile
24%inclusion6 decks25 decks
-18%synergy
Retraction Helix
20%inclusion5 decks25 decks
19%synergy
Banishing Knack
16%inclusion4 decks25 decks
16%synergy
Brain Freeze
16%inclusion4 decks25 decks
15%synergy
Deadly Rollick
12%inclusion3 decks25 decks
-2%synergy
Saw in Half
12%inclusion3 decks25 decks
10%synergy
Teferi's Protection
12%inclusion3 decks25 decks
-5%synergy
Sacrifice
12%inclusion3 decks25 decks
11%synergy
Counterspell
12%inclusion3 decks25 decks
-29%synergy
Void Rend
8.0%inclusion2 decks25 decks
-26%synergy
Fell the Profane
8.0%inclusion2 decks25 decks
-1%synergy
Brainstorm
8.0%inclusion2 decks25 decks
-9%synergy
Culling the Weak
8.0%inclusion2 decks25 decks
6%synergy
Snuff Out
8.0%inclusion2 decks25 decks
0%synergy
Sorceries
Toxic Deluge
32%inclusion8 decks25 decks
12%synergy
Beseech the Mirror
28%inclusion7 decks25 decks
24%synergy
Lively Dirge
24%inclusion6 decks25 decks
23%synergy
Reanimate
24%inclusion6 decks25 decks
8%synergy
Cabal Therapy
20%inclusion5 decks25 decks
20%synergy
Replenish
16%inclusion4 decks25 decks
14%synergy
Mnemonic Betrayal
12%inclusion3 decks25 decks
9%synergy
Windfall
12%inclusion3 decks25 decks
-2%synergy
Demonic Counsel
12%inclusion3 decks25 decks
11%synergy
Idyllic Tutor
8.0%inclusion2 decks25 decks
4%synergy
Grim Tutor
8.0%inclusion2 decks25 decks
4%synergy
Damn
8.0%inclusion2 decks25 decks
-12%synergy
Redress Fate
8.0%inclusion2 decks25 decks
2%synergy
Utility Artifacts
Wishclaw Talisman
52%inclusion13 decks25 decks
44%synergy
Sensei's Divining Top
16%inclusion4 decks25 decks
6%synergy
Vexing Bauble
16%inclusion4 decks25 decks
14%synergy
Mesmeric Orb
12%inclusion3 decks25 decks
11%synergy
Enchantments
Tinybones Joins Up
68%inclusion17 decks25 decks
67%synergy
Necropotence
56%inclusion14 decks25 decks
49%synergy
Amphibian Downpour
48%inclusion12 decks25 decks
43%synergy
Copy Artifact
40%inclusion10 decks25 decks
39%synergy
The Meathook Massacre
36%inclusion9 decks25 decks
33%synergy
Steal Enchantment
36%inclusion9 decks25 decks
35%synergy
Chthonian Nightmare
32%inclusion8 decks25 decks
31%synergy
Trouble in Pairs
32%inclusion8 decks25 decks
26%synergy
Counterbalance
28%inclusion7 decks25 decks
26%synergy
Touch the Spirit Realm
28%inclusion7 decks25 decks
25%synergy
Static Prison
28%inclusion7 decks25 decks
28%synergy
Starfield of Nyx
20%inclusion5 decks25 decks
16%synergy
Stillness in Motion
19%inclusion3 decks16 decks
18%synergy
Bloodchief Ascension
16%inclusion4 decks25 decks
11%synergy
Mirrormade
16%inclusion4 decks25 decks
6%synergy
Cemetery Tampering
16%inclusion4 decks25 decks
15%synergy
Founding the Third Path
12%inclusion3 decks25 decks
12%synergy
Enchanted Evening
12%inclusion3 decks25 decks
10%synergy
Land Tax
12%inclusion3 decks25 decks
6%synergy
Hallowed Haunting
12%inclusion3 decks25 decks
10%synergy
Chains of Mephistopheles
12%inclusion3 decks25 decks
12%synergy
Darksteel Mutation
12%inclusion3 decks25 decks
6%synergy
Sphere of Safety
12%inclusion3 decks25 decks
3%synergy
Leyline of Anticipation
12%inclusion3 decks25 decks
7%synergy
Ghostly Prison
12%inclusion3 decks25 decks
-10%synergy
Secret Arcade // Dusty Parlor
12%inclusion3 decks25 decks
7%synergy
Propaganda
12%inclusion3 decks25 decks
-15%synergy
Teval's Judgment
12%inclusion2 decks17 decks
11%synergy
Estrid's Invocation
8.0%inclusion2 decks25 decks
3%synergy
Shark Typhoon
8.0%inclusion2 decks25 decks
2%synergy
Monologue Tax
8.0%inclusion2 decks25 decks
2%synergy
Aura of Silence
8.0%inclusion2 decks25 decks
5%synergy
Out of the Tombs
8.0%inclusion2 decks25 decks
8%synergy
Exquisite Blood
8.0%inclusion2 decks25 decks
2%synergy
Seal of Cleansing
8.0%inclusion2 decks25 decks
7%synergy
Black Market Connections
8.0%inclusion2 decks25 decks
-6%synergy
Solemnity
8.0%inclusion2 decks25 decks
5%synergy
The Cruelty of Gix
8.0%inclusion2 decks25 decks
8%synergy
Authority of the Consuls
8.0%inclusion2 decks25 decks
-3%synergy
Mind Over Matter
8.0%inclusion2 decks25 decks
8%synergy
Phyrexian Unlife
8.0%inclusion2 decks25 decks
6%synergy
Sheltered by Ghosts
8.0%inclusion2 decks25 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
48%inclusion12 decks25 decks
40%synergy
Utility Lands
Otawara, Soaring City
80%inclusion20 decks25 decks
61%synergy
Urza's Saga
48%inclusion12 decks25 decks
36%synergy
Serra's Sanctum
28%inclusion7 decks25 decks
26%synergy
Emergence Zone
28%inclusion7 decks25 decks
26%synergy
Takenuma, Abandoned Mire
28%inclusion7 decks25 decks
21%synergy
Minamo, School at Water's Edge
24%inclusion6 decks25 decks
20%synergy
Hall of Heliod's Generosity
24%inclusion6 decks25 decks
11%synergy
Cephalid Coliseum
16%inclusion4 decks25 decks
12%synergy
Uthros, Titanic Godcore
13%inclusion1 decks8 decks
9%synergy
Urborg, Tomb of Yawgmoth
12%inclusion3 decks25 decks
-1%synergy
Bojuka Bog
8.0%inclusion2 decks25 decks
-19%synergy
Mistrise Village
5.9%inclusion1 decks17 decks
2%synergy
Mana Artifacts
Arcane Signet
100%inclusion25 decks25 decks
12%synergy
Sol Ring
92%inclusion23 decks25 decks
2%synergy
Lotus Petal
76%inclusion19 decks25 decks
65%synergy
Talisman of Dominance
72%inclusion18 decks25 decks
23%synergy
Lion's Eye Diamond
68%inclusion17 decks25 decks
66%synergy
Mox Opal
60%inclusion15 decks25 decks
51%synergy
Fellwar Stone
60%inclusion15 decks25 decks
26%synergy
Talisman of Hierarchy
48%inclusion12 decks25 decks
5%synergy
Talisman of Progress
40%inclusion10 decks25 decks
-3%synergy
Grim Monolith
36%inclusion9 decks25 decks
32%synergy
The Soul Stone
25%inclusion2 decks8 decks
22%synergy
Mox Amber
20%inclusion5 decks25 decks
14%synergy
Dimir Signet
8.0%inclusion2 decks25 decks
-24%synergy
Azorius Signet
8.0%inclusion2 decks25 decks
-24%synergy
Lands
Tundra
100%inclusion25 decks25 decks
84%synergy
Command Tower
100%inclusion25 decks25 decks
8%synergy
Underground Sea
100%inclusion25 decks25 decks
84%synergy
Scrubland
100%inclusion25 decks25 decks
84%synergy
Watery Grave
100%inclusion25 decks25 decks
50%synergy
Marsh Flats
96%inclusion24 decks25 decks
60%synergy
Polluted Delta
96%inclusion24 decks25 decks
58%synergy
Godless Shrine
96%inclusion24 decks25 decks
46%synergy
Flooded Strand
92%inclusion23 decks25 decks
54%synergy
Hallowed Fountain
92%inclusion23 decks25 decks
43%synergy
Bloodstained Mire
84%inclusion21 decks25 decks
73%synergy
Misty Rainforest
76%inclusion19 decks25 decks
65%synergy
Verdant Catacombs
76%inclusion19 decks25 decks
66%synergy
Undercity Sewers
76%inclusion19 decks25 decks
62%synergy
Mana Confluence
72%inclusion18 decks25 decks
58%synergy
Windswept Heath
68%inclusion17 decks25 decks
58%synergy
Arid Mesa
68%inclusion17 decks25 decks
58%synergy
Morphic Pool
64%inclusion16 decks25 decks
30%synergy
City of Brass
64%inclusion16 decks25 decks
49%synergy
Gemstone Caverns
64%inclusion16 decks25 decks
56%synergy
Vault of Champions
60%inclusion15 decks25 decks
27%synergy
Scalding Tarn
60%inclusion15 decks25 decks
49%synergy
Sea of Clouds
56%inclusion14 decks25 decks
20%synergy
Exotic Orchard
56%inclusion14 decks25 decks
-3%synergy
Island
48%inclusion12 decks25 decks
-45%synergy
Meticulous Archive
40%inclusion10 decks25 decks
26%synergy
Shadowy Backstreet
40%inclusion10 decks25 decks
28%synergy
Swamp
40%inclusion10 decks25 decks
-51%synergy
Plains
36%inclusion9 decks25 decks
-55%synergy
Raffine's Tower
32%inclusion8 decks25 decks
-9%synergy
Sink into Stupor
24%inclusion6 decks25 decks
11%synergy
Snow-Covered Swamp
20%inclusion5 decks25 decks
17%synergy
Forbidden Orchard
20%inclusion5 decks25 decks
17%synergy
Snow-Covered Plains
16%inclusion4 decks25 decks
13%synergy
Valgavoth's Lair
12%inclusion3 decks25 decks
9%synergy
Underground River
12%inclusion3 decks25 decks
-21%synergy
Spire of Industry
12%inclusion3 decks25 decks
3%synergy
Snow-Covered Island
12%inclusion3 decks25 decks
9%synergy
Cavern of Souls
12%inclusion3 decks25 decks
5%synergy
Bleachbone Verge
8.3%inclusion2 decks24 decks
0%synergy
Glacial Fortress
8.0%inclusion2 decks25 decks
-32%synergy
Caves of Koilos
8.0%inclusion2 decks25 decks
-27%synergy
Isolated Chapel
8.0%inclusion2 decks25 decks
-31%synergy
Floodfarm Verge
8.0%inclusion2 decks25 decks
-3%synergy
Fell the Profane
8.0%inclusion2 decks25 decks
-1%synergy
Reflecting Pool
8.0%inclusion2 decks25 decks
0%synergy
Adarkar Wastes
8.0%inclusion2 decks25 decks
-23%synergy
Arcane Sanctum
8.0%inclusion2 decks25 decks
-46%synergy
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