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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Utility Artifacts
Enchantments
Planeswalkers
Utility Lands
Mana Artifacts
Lands
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Wan Shi Tong, Librarian
50%inclusion2 decks4 decks
45%synergy
Bender's Waterskin
17%inclusion1 decks6 decks
14%synergy
High Synergy Cards
Abdel Adrian, Gorion's Ward
92%inclusion22 decks24 decks
90%synergy
Necromancy
92%inclusion22 decks24 decks
87%synergy
Animate Dead
96%inclusion23 decks24 decks
86%synergy
Entomb
92%inclusion22 decks24 decks
85%synergy
Dance of the Dead
83%inclusion20 decks24 decks
81%synergy
Dress Down
83%inclusion20 decks24 decks
81%synergy
Mystic Remora
96%inclusion23 decks24 decks
74%synergy
Intuition
71%inclusion17 decks24 decks
69%synergy
Imperial Seal
75%inclusion18 decks24 decks
67%synergy
Blind Obedience
79%inclusion19 decks24 decks
67%synergy
Top Cards
Esper Sentinel
88%inclusion21 decks24 decks
60%synergy
Dark Ritual
79%inclusion19 decks24 decks
60%synergy
Force of Will
75%inclusion18 decks24 decks
62%synergy
Thassa's Oracle
75%inclusion18 decks24 decks
65%synergy
Valley Floodcaller
71%inclusion17 decks24 decks
67%synergy
Swords to Plowshares
71%inclusion17 decks24 decks
3%synergy
Sevinne's Reclamation
71%inclusion17 decks24 decks
62%synergy
Ripples of Undeath
67%inclusion16 decks24 decks
64%synergy
Tinybones Joins Up
67%inclusion16 decks24 decks
65%synergy
Fierce Guardianship
67%inclusion16 decks24 decks
46%synergy
Game Changers
Vampiric Tutor
100%inclusion24 decks24 decks
82%synergy
Enlightened Tutor
96%inclusion23 decks24 decks
76%synergy
Ancient Tomb
96%inclusion23 decks24 decks
83%synergy
Rhystic Study
96%inclusion23 decks24 decks
63%synergy
Demonic Tutor
96%inclusion23 decks24 decks
74%synergy
Smothering Tithe
88%inclusion21 decks24 decks
55%synergy
Chrome Mox
88%inclusion21 decks24 decks
78%synergy
The One Ring
88%inclusion21 decks24 decks
74%synergy
Mox Diamond
88%inclusion21 decks24 decks
80%synergy
Orcish Bowmasters
83%inclusion20 decks24 decks
72%synergy
Creatures
Lotho, Corrupt Shirriff
67%inclusion16 decks24 decks
50%synergy
Grand Abolisher
67%inclusion16 decks24 decks
52%synergy
Opposition Agent
58%inclusion14 decks24 decks
49%synergy
Ranger-Captain of Eos
58%inclusion14 decks24 decks
52%synergy
Displacer Kitten
54%inclusion13 decks24 decks
47%synergy
Auriok Salvagers
54%inclusion13 decks24 decks
54%synergy
Hullbreaker Horror
50%inclusion12 decks24 decks
44%synergy
Ledger Shredder
42%inclusion10 decks24 decks
33%synergy
Drannith Magistrate
42%inclusion10 decks24 decks
33%synergy
Lurrus of the Dream-Den
42%inclusion10 decks24 decks
40%synergy
Psychic Frog
38%inclusion9 decks24 decks
31%synergy
Talion, the Kindly Lord
29%inclusion7 decks24 decks
21%synergy
Archivist of Oghma
29%inclusion7 decks24 decks
22%synergy
Phyrexian Metamorph
25%inclusion6 decks24 decks
16%synergy
Mockingbird
25%inclusion6 decks24 decks
21%synergy
Voice of Victory
25%inclusion4 decks16 decks
17%synergy
Victor, Valgavoth's Seneschal
25%inclusion6 decks24 decks
23%synergy
Overlord of the Balemurk
21%inclusion5 decks24 decks
19%synergy
Inquisitive Glimmer
21%inclusion5 decks24 decks
13%synergy
Entity Tracker
21%inclusion5 decks24 decks
14%synergy
Starfield Mystic
17%inclusion4 decks24 decks
10%synergy
Pollywog Prodigy
17%inclusion4 decks24 decks
13%synergy
Heliod, the Radiant Dawn
17%inclusion4 decks24 decks
13%synergy
Hedron Crab
17%inclusion4 decks24 decks
16%synergy
Snapcaster Mage
13%inclusion3 decks24 decks
11%synergy
Leonin Relic-Warder
13%inclusion3 decks24 decks
12%synergy
Scrabbling Skullcrab
13%inclusion3 decks24 decks
11%synergy
Fear of Impostors
13%inclusion3 decks24 decks
11%synergy
Hoarding Broodlord
13%inclusion3 decks24 decks
11%synergy
Mesa Enchantress
13%inclusion3 decks24 decks
3%synergy
Grim Guardian
13%inclusion3 decks24 decks
10%synergy
Zur, Eternal Schemer
13%inclusion3 decks24 decks
9%synergy
Demon of Fate's Design
8.3%inclusion2 decks24 decks
3%synergy
Enduring Tenacity
8.3%inclusion2 decks24 decks
1%synergy
Enduring Curiosity
8.3%inclusion2 decks24 decks
1%synergy
Faerie Mastermind
8.3%inclusion2 decks24 decks
-1%synergy
Ondu Spiritdancer
8.3%inclusion2 decks24 decks
2%synergy
Zur the Enchanter
8.3%inclusion2 decks24 decks
3%synergy
Emry, Lurker of the Loch
8.3%inclusion2 decks24 decks
3%synergy
Ghostly Pilferer
8.3%inclusion2 decks24 decks
1%synergy
Volatile Stormdrake
8.3%inclusion2 decks24 decks
7%synergy
Grand Arbiter Augustin IV
8.3%inclusion2 decks24 decks
3%synergy
Tameshi, Reality Architect
8.3%inclusion2 decks24 decks
8%synergy
Instants
Cyclonic Rift
67%inclusion16 decks24 decks
42%synergy
Silence
67%inclusion16 decks24 decks
56%synergy
Mindbreak Trap
63%inclusion15 decks24 decks
56%synergy
Tainted Pact
63%inclusion15 decks24 decks
55%synergy
Demonic Consultation
63%inclusion15 decks24 decks
54%synergy
Force of Negation
63%inclusion15 decks24 decks
51%synergy
Pact of Negation
63%inclusion15 decks24 decks
54%synergy
Flusterstorm
58%inclusion14 decks24 decks
50%synergy
Borne Upon a Wind
58%inclusion14 decks24 decks
54%synergy
Mental Misstep
58%inclusion14 decks24 decks
51%synergy
Mystical Tutor
54%inclusion13 decks24 decks
42%synergy
Cabal Ritual
50%inclusion12 decks24 decks
47%synergy
Swan Song
46%inclusion11 decks24 decks
26%synergy
An Offer You Can't Refuse
42%inclusion10 decks24 decks
15%synergy
Mana Drain
38%inclusion9 decks24 decks
20%synergy
Gifts Ungiven
33%inclusion8 decks24 decks
31%synergy
Into the Flood Maw
33%inclusion8 decks24 decks
30%synergy
Chain of Vapor
25%inclusion6 decks24 decks
22%synergy
Sink into Stupor
21%inclusion5 decks24 decks
8%synergy
Retraction Helix
21%inclusion5 decks24 decks
20%synergy
Banishing Knack
17%inclusion4 decks24 decks
16%synergy
Path to Exile
17%inclusion4 decks24 decks
-25%synergy
Brain Freeze
17%inclusion4 decks24 decks
16%synergy
Counterspell
13%inclusion3 decks24 decks
-29%synergy
Sacrifice
13%inclusion3 decks24 decks
12%synergy
Teferi's Protection
13%inclusion3 decks24 decks
-4%synergy
Saw in Half
13%inclusion3 decks24 decks
10%synergy
Deadly Rollick
8.3%inclusion2 decks24 decks
-5%synergy
Culling the Weak
8.3%inclusion2 decks24 decks
7%synergy
Snuff Out
8.3%inclusion2 decks24 decks
1%synergy
Void Rend
8.3%inclusion2 decks24 decks
-25%synergy
Sorceries
Lively Dirge
29%inclusion7 decks24 decks
28%synergy
Beseech the Mirror
29%inclusion7 decks24 decks
25%synergy
Toxic Deluge
25%inclusion6 decks24 decks
6%synergy
Cabal Therapy
21%inclusion5 decks24 decks
21%synergy
Replenish
17%inclusion4 decks24 decks
15%synergy
Reanimate
17%inclusion4 decks24 decks
1%synergy
Mnemonic Betrayal
13%inclusion3 decks24 decks
9%synergy
Demonic Counsel
13%inclusion3 decks24 decks
11%synergy
Grim Tutor
8.3%inclusion2 decks24 decks
4%synergy
Windfall
8.3%inclusion2 decks24 decks
-5%synergy
Idyllic Tutor
8.3%inclusion2 decks24 decks
4%synergy
Redress Fate
8.3%inclusion2 decks24 decks
2%synergy
Utility Artifacts
Wishclaw Talisman
54%inclusion13 decks24 decks
46%synergy
Sensei's Divining Top
17%inclusion4 decks24 decks
7%synergy
Vexing Bauble
17%inclusion4 decks24 decks
15%synergy
Mesmeric Orb
13%inclusion3 decks24 decks
11%synergy
Enchantments
Necropotence
58%inclusion14 decks24 decks
51%synergy
Amphibian Downpour
46%inclusion11 decks24 decks
41%synergy
Copy Artifact
42%inclusion10 decks24 decks
41%synergy
The Meathook Massacre
38%inclusion9 decks24 decks
34%synergy
Steal Enchantment
38%inclusion9 decks24 decks
37%synergy
Chthonian Nightmare
33%inclusion8 decks24 decks
33%synergy
Counterbalance
29%inclusion7 decks24 decks
27%synergy
Trouble in Pairs
29%inclusion7 decks24 decks
24%synergy
Touch the Spirit Realm
29%inclusion7 decks24 decks
27%synergy
Static Prison
29%inclusion7 decks24 decks
29%synergy
Stillness in Motion
20%inclusion3 decks15 decks
20%synergy
Bloodchief Ascension
17%inclusion4 decks24 decks
12%synergy
Mirrormade
17%inclusion4 decks24 decks
7%synergy
Starfield of Nyx
17%inclusion4 decks24 decks
13%synergy
Cemetery Tampering
17%inclusion4 decks24 decks
16%synergy
Ghostly Prison
17%inclusion4 decks24 decks
-5%synergy
Propaganda
13%inclusion3 decks24 decks
-14%synergy
Teval's Judgment
13%inclusion2 decks16 decks
12%synergy
Leyline of Anticipation
13%inclusion3 decks24 decks
8%synergy
Chains of Mephistopheles
13%inclusion3 decks24 decks
12%synergy
Darksteel Mutation
13%inclusion3 decks24 decks
6%synergy
Secret Arcade // Dusty Parlor
13%inclusion3 decks24 decks
7%synergy
Land Tax
13%inclusion3 decks24 decks
6%synergy
Out of the Tombs
8.3%inclusion2 decks24 decks
8%synergy
Authority of the Consuls
8.3%inclusion2 decks24 decks
-3%synergy
Phyrexian Unlife
8.3%inclusion2 decks24 decks
7%synergy
Enchanted Evening
8.3%inclusion2 decks24 decks
7%synergy
The Cruelty of Gix
8.3%inclusion2 decks24 decks
8%synergy
Shark Typhoon
8.3%inclusion2 decks24 decks
3%synergy
Sphere of Safety
8.3%inclusion2 decks24 decks
-1%synergy
Monologue Tax
8.3%inclusion2 decks24 decks
2%synergy
Hallowed Haunting
8.3%inclusion2 decks24 decks
6%synergy
Greater Auramancy
8.3%inclusion2 decks24 decks
4%synergy
Aura of Silence
8.3%inclusion2 decks24 decks
5%synergy
Founding the Third Path
8.3%inclusion2 decks24 decks
8%synergy
Mind Over Matter
8.3%inclusion2 decks24 decks
8%synergy
Estrid's Invocation
8.3%inclusion2 decks24 decks
4%synergy
Exquisite Blood
8.3%inclusion2 decks24 decks
2%synergy
Phyrexian Arena
8.3%inclusion2 decks24 decks
-6%synergy
Solemnity
8.3%inclusion2 decks24 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
54%inclusion13 decks24 decks
46%synergy
Utility Lands
Otawara, Soaring City
79%inclusion19 decks24 decks
60%synergy
Urza's Saga
46%inclusion11 decks24 decks
34%synergy
Serra's Sanctum
29%inclusion7 decks24 decks
27%synergy
Hall of Heliod's Generosity
29%inclusion7 decks24 decks
16%synergy
Emergence Zone
29%inclusion7 decks24 decks
27%synergy
Takenuma, Abandoned Mire
25%inclusion6 decks24 decks
18%synergy
Minamo, School at Water's Edge
25%inclusion6 decks24 decks
21%synergy
Cephalid Coliseum
17%inclusion4 decks24 decks
13%synergy
Uthros, Titanic Godcore
14%inclusion1 decks7 decks
11%synergy
Urborg, Tomb of Yawgmoth
13%inclusion3 decks24 decks
-1%synergy
Mistrise Village
6.3%inclusion1 decks16 decks
2%synergy
Mana Artifacts
Arcane Signet
100%inclusion24 decks24 decks
12%synergy
Sol Ring
92%inclusion22 decks24 decks
2%synergy
Mana Vault
83%inclusion20 decks24 decks
74%synergy
Lotus Petal
79%inclusion19 decks24 decks
68%synergy
Talisman of Dominance
75%inclusion18 decks24 decks
26%synergy
Lion's Eye Diamond
71%inclusion17 decks24 decks
69%synergy
Mox Opal
63%inclusion15 decks24 decks
54%synergy
Fellwar Stone
58%inclusion14 decks24 decks
24%synergy
Talisman of Hierarchy
46%inclusion11 decks24 decks
3%synergy
Talisman of Progress
42%inclusion10 decks24 decks
-1%synergy
Grim Monolith
38%inclusion9 decks24 decks
34%synergy
The Soul Stone
29%inclusion2 decks7 decks
26%synergy
Mox Amber
21%inclusion5 decks24 decks
15%synergy
Azorius Signet
8.3%inclusion2 decks24 decks
-24%synergy
Dimir Signet
8.3%inclusion2 decks24 decks
-24%synergy
Lands
Tundra
100%inclusion24 decks24 decks
84%synergy
Watery Grave
100%inclusion24 decks24 decks
50%synergy
Underground Sea
100%inclusion24 decks24 decks
84%synergy
Command Tower
100%inclusion24 decks24 decks
8%synergy
Scrubland
100%inclusion24 decks24 decks
84%synergy
Godless Shrine
96%inclusion23 decks24 decks
46%synergy
Marsh Flats
96%inclusion23 decks24 decks
60%synergy
Polluted Delta
96%inclusion23 decks24 decks
59%synergy
Hallowed Fountain
92%inclusion22 decks24 decks
43%synergy
Flooded Strand
92%inclusion22 decks24 decks
54%synergy
Undercity Sewers
79%inclusion19 decks24 decks
65%synergy
Bloodstained Mire
79%inclusion19 decks24 decks
68%synergy
Mana Confluence
75%inclusion18 decks24 decks
61%synergy
Misty Rainforest
71%inclusion17 decks24 decks
60%synergy
Verdant Catacombs
71%inclusion17 decks24 decks
60%synergy
Gemstone Caverns
71%inclusion17 decks24 decks
63%synergy
City of Brass
71%inclusion17 decks24 decks
56%synergy
Morphic Pool
67%inclusion16 decks24 decks
32%synergy
Windswept Heath
63%inclusion15 decks24 decks
53%synergy
Arid Mesa
63%inclusion15 decks24 decks
52%synergy
Vault of Champions
63%inclusion15 decks24 decks
30%synergy
Exotic Orchard
58%inclusion14 decks24 decks
0%synergy
Sea of Clouds
58%inclusion14 decks24 decks
23%synergy
Scalding Tarn
54%inclusion13 decks24 decks
43%synergy
Island
46%inclusion11 decks24 decks
-47%synergy
Shadowy Backstreet
42%inclusion10 decks24 decks
29%synergy
Meticulous Archive
42%inclusion10 decks24 decks
28%synergy
Swamp
38%inclusion9 decks24 decks
-54%synergy
Plains
33%inclusion8 decks24 decks
-58%synergy
Raffine's Tower
29%inclusion7 decks24 decks
-12%synergy
Sink into Stupor
21%inclusion5 decks24 decks
8%synergy
Forbidden Orchard
21%inclusion5 decks24 decks
18%synergy
Spire of Industry
17%inclusion4 decks24 decks
8%synergy
Underground River
17%inclusion4 decks24 decks
-16%synergy
Snow-Covered Swamp
17%inclusion4 decks24 decks
13%synergy
Caves of Koilos
13%inclusion3 decks24 decks
-23%synergy
Snow-Covered Plains
13%inclusion3 decks24 decks
9%synergy
Valgavoth's Lair
13%inclusion3 decks24 decks
10%synergy
Cavern of Souls
13%inclusion3 decks24 decks
6%synergy
Floodfarm Verge
13%inclusion3 decks24 decks
1%synergy
Bleachbone Verge
8.7%inclusion2 decks23 decks
0%synergy
Glacial Fortress
8.3%inclusion2 decks24 decks
-31%synergy
Snow-Covered Island
8.3%inclusion2 decks24 decks
5%synergy
Adarkar Wastes
8.3%inclusion2 decks24 decks
-22%synergy
Reflecting Pool
8.3%inclusion2 decks24 decks
0%synergy
Arcane Sanctum
8.3%inclusion2 decks24 decks
-46%synergy
Isolated Chapel
8.3%inclusion2 decks24 decks
-30%synergy
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