The Master of Keys (Commander) - Expensive Control

The Master of Keys
Rank #314
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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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Wan Shi Tong, Librarian
75%inclusion3 decks4 decks
70%synergy
High Synergy Cards
Necromancy
94%inclusion16 decks17 decks
89%synergy
Entomb
94%inclusion16 decks17 decks
87%synergy
Force of Negation
94%inclusion16 decks17 decks
82%synergy
Tainted Pact
88%inclusion15 decks17 decks
81%synergy
Pact of Negation
88%inclusion15 decks17 decks
80%synergy
Flusterstorm
88%inclusion15 decks17 decks
80%synergy
Dress Down
82%inclusion14 decks17 decks
80%synergy
Demonic Consultation
88%inclusion15 decks17 decks
80%synergy
Animate Dead
88%inclusion15 decks17 decks
78%synergy
Silence
88%inclusion15 decks17 decks
78%synergy
Top Cards
Mystic Remora
94%inclusion16 decks17 decks
73%synergy
Dark Ritual
88%inclusion15 decks17 decks
69%synergy
Esper Sentinel
88%inclusion15 decks17 decks
60%synergy
Smothering Tithe
82%inclusion14 decks17 decks
50%synergy
Imperial Seal
82%inclusion14 decks17 decks
75%synergy
Mental Misstep
82%inclusion14 decks17 decks
75%synergy
Mindbreak Trap
82%inclusion14 decks17 decks
75%synergy
Swan Song
82%inclusion14 decks17 decks
63%synergy
Grand Abolisher
82%inclusion14 decks17 decks
68%synergy
Orcish Bowmasters
82%inclusion14 decks17 decks
71%synergy
Game Changers
Ancient Tomb
94%inclusion16 decks17 decks
81%synergy
Demonic Tutor
94%inclusion16 decks17 decks
73%synergy
Force of Will
94%inclusion16 decks17 decks
81%synergy
Enlightened Tutor
94%inclusion16 decks17 decks
74%synergy
Thassa's Oracle
88%inclusion15 decks17 decks
78%synergy
Intuition
88%inclusion15 decks17 decks
87%synergy
Rhystic Study
88%inclusion15 decks17 decks
56%synergy
Mana Vault
88%inclusion15 decks17 decks
79%synergy
Chrome Mox
88%inclusion15 decks17 decks
79%synergy
Vampiric Tutor
88%inclusion15 decks17 decks
70%synergy
Creatures
Lotho, Corrupt Shirriff
76%inclusion13 decks17 decks
59%synergy
Abdel Adrian, Gorion's Ward
76%inclusion13 decks17 decks
75%synergy
Ranger-Captain of Eos
76%inclusion13 decks17 decks
70%synergy
Voice of Victory
56%inclusion5 decks9 decks
47%synergy
Phyrexian Metamorph
53%inclusion9 decks17 decks
44%synergy
Archivist of Oghma
47%inclusion8 decks17 decks
40%synergy
Displacer Kitten
47%inclusion8 decks17 decks
40%synergy
Opposition Agent
47%inclusion8 decks17 decks
38%synergy
Hullbreaker Horror
47%inclusion8 decks17 decks
41%synergy
Valley Floodcaller
41%inclusion7 decks17 decks
37%synergy
Ghostly Pilferer
41%inclusion7 decks17 decks
34%synergy
Tataru Taru
38%inclusion3 decks8 decks
29%synergy
Mockingbird
35%inclusion6 decks17 decks
31%synergy
Auriok Salvagers
35%inclusion6 decks17 decks
35%synergy
Drannith Magistrate
29%inclusion5 decks17 decks
21%synergy
Emet-Selch of the Third Seat
25%inclusion2 decks8 decks
15%synergy
Hoarding Broodlord
24%inclusion4 decks17 decks
22%synergy
Lurrus of the Dream-Den
24%inclusion4 decks17 decks
22%synergy
Faerie Mastermind
24%inclusion4 decks17 decks
14%synergy
Ledger Shredder
24%inclusion4 decks17 decks
15%synergy
Talion, the Kindly Lord
18%inclusion3 decks17 decks
10%synergy
Academy Rector
18%inclusion3 decks17 decks
17%synergy
High Fae Trickster
17%inclusion2 decks12 decks
12%synergy
Symbiote Spider-Man
14%inclusion1 decks7 decks
14%synergy
Fandaniel, Telophoroi Ascian
13%inclusion1 decks8 decks
6%synergy
Papalymo Totolymo
13%inclusion1 decks8 decks
2%synergy
Volatile Stormdrake
12%inclusion2 decks17 decks
10%synergy
Flesh Duplicate
12%inclusion2 decks17 decks
11%synergy
Cephalid Illusionist
12%inclusion2 decks17 decks
12%synergy
Ruthless Technomancer
12%inclusion2 decks17 decks
11%synergy
Overlord of the Balemurk
12%inclusion2 decks17 decks
10%synergy
Hedron Crab
12%inclusion2 decks17 decks
11%synergy
Gilded Drake
12%inclusion2 decks17 decks
10%synergy
Leonin Relic-Warder
12%inclusion2 decks17 decks
12%synergy
Nomads en-Kor
12%inclusion2 decks17 decks
12%synergy
Phantasmal Image
12%inclusion2 decks17 decks
9%synergy
Psychic Frog
12%inclusion2 decks17 decks
5%synergy
Y'shtola, Night's Blessed
10%inclusion1 decks10 decks
9%synergy
Neerdiv, Devious Diver
8.3%inclusion1 decks12 decks
8%synergy
Starfield Mystic
5.9%inclusion1 decks17 decks
-1%synergy
Felidar Guardian
5.9%inclusion1 decks17 decks
4%synergy
Sheoldred, the Apocalypse
5.9%inclusion1 decks17 decks
-3%synergy
Vohar, Vodalian Desecrator
5.9%inclusion1 decks17 decks
2%synergy
Spellseeker
5.9%inclusion1 decks17 decks
4%synergy
Doom Whisperer
5.9%inclusion1 decks17 decks
4%synergy
Inquisitive Glimmer
5.9%inclusion1 decks17 decks
-2%synergy
Fear of Impostors
5.9%inclusion1 decks17 decks
4%synergy
Sage of Mysteries
5.9%inclusion1 decks17 decks
6%synergy
Drana and Linvala
5.9%inclusion1 decks17 decks
4%synergy
Stitcher's Supplier
5.9%inclusion1 decks17 decks
5%synergy
Instants
Mystical Tutor
82%inclusion14 decks17 decks
71%synergy
Swords to Plowshares
76%inclusion13 decks17 decks
8%synergy
Borne Upon a Wind
65%inclusion11 decks17 decks
60%synergy
Fierce Guardianship
59%inclusion10 decks17 decks
38%synergy
An Offer You Can't Refuse
47%inclusion8 decks17 decks
20%synergy
Cyclonic Rift
47%inclusion8 decks17 decks
23%synergy
Cabal Ritual
41%inclusion7 decks17 decks
38%synergy
Into the Flood Maw
41%inclusion7 decks17 decks
37%synergy
Darkblast
35%inclusion6 decks17 decks
35%synergy
Chain of Vapor
29%inclusion5 decks17 decks
26%synergy
Brain Freeze
29%inclusion5 decks17 decks
29%synergy
Gifts Ungiven
29%inclusion5 decks17 decks
27%synergy
Mana Drain
29%inclusion5 decks17 decks
12%synergy
Culling the Weak
24%inclusion4 decks17 decks
22%synergy
Commandeer
18%inclusion3 decks17 decks
17%synergy
Sink into Stupor
18%inclusion3 decks17 decks
5%synergy
Path to Exile
18%inclusion3 decks17 decks
-24%synergy
Sacrifice
12%inclusion2 decks17 decks
11%synergy
Orim's Chant
12%inclusion2 decks17 decks
10%synergy
Lim-Dûl's Vault
12%inclusion2 decks17 decks
8%synergy
Flare of Denial
12%inclusion2 decks17 decks
10%synergy
Dispel
12%inclusion2 decks17 decks
8%synergy
Strix Serenade
12%inclusion2 decks17 decks
8%synergy
Saw in Half
12%inclusion2 decks17 decks
10%synergy
Muddle the Mixture
5.9%inclusion1 decks17 decks
2%synergy
Argivian Find
5.9%inclusion1 decks17 decks
6%synergy
Dovin's Veto
5.9%inclusion1 decks17 decks
-19%synergy
Retraction Helix
5.9%inclusion1 decks17 decks
5%synergy
Snuff Out
5.9%inclusion1 decks17 decks
-2%synergy
Brainstorm
5.9%inclusion1 decks17 decks
-11%synergy
Spell Snare
5.9%inclusion1 decks17 decks
6%synergy
Thirst for Meaning
5.9%inclusion1 decks17 decks
4%synergy
Arcane Denial
5.9%inclusion1 decks17 decks
-14%synergy
Anguished Unmaking
5.9%inclusion1 decks17 decks
-19%synergy
Misdirection
5.9%inclusion1 decks17 decks
4%synergy
Spell Pierce
5.9%inclusion1 decks17 decks
3%synergy
Dramatic Reversal
5.9%inclusion1 decks17 decks
4%synergy
March of Swirling Mist
5.9%inclusion1 decks17 decks
5%synergy
Miscast
5.9%inclusion1 decks17 decks
5%synergy
Snapback
5.9%inclusion1 decks17 decks
6%synergy
Dig Through Time
5.9%inclusion1 decks17 decks
1%synergy
Sorceries
Sevinne's Reclamation
65%inclusion11 decks17 decks
56%synergy
Reanimate
53%inclusion9 decks17 decks
37%synergy
Toxic Deluge
29%inclusion5 decks17 decks
10%synergy
Yawgmoth's Will
24%inclusion4 decks17 decks
22%synergy
Beseech the Mirror
24%inclusion4 decks17 decks
19%synergy
Windfall
18%inclusion3 decks17 decks
4%synergy
Lively Dirge
18%inclusion3 decks17 decks
16%synergy
Unmarked Grave
18%inclusion3 decks17 decks
16%synergy
Replenish
18%inclusion3 decks17 decks
16%synergy
Mnemonic Betrayal
18%inclusion3 decks17 decks
15%synergy
Space-Time Anomaly
14%inclusion1 decks7 decks
13%synergy
Circle of Power
13%inclusion1 decks8 decks
5%synergy
Cornered by Black Mages
13%inclusion1 decks8 decks
10%synergy
Resurgent Belief
12%inclusion2 decks17 decks
10%synergy
Vindicate
12%inclusion2 decks17 decks
2%synergy
Timetwister
12%inclusion2 decks17 decks
11%synergy
Cabal Therapy
5.9%inclusion1 decks17 decks
6%synergy
Supreme Verdict
5.9%inclusion1 decks17 decks
-9%synergy
Diabolic Intent
5.9%inclusion1 decks17 decks
1%synergy
Split Up
5.9%inclusion1 decks17 decks
5%synergy
Careful Study
5.9%inclusion1 decks17 decks
4%synergy
Dread Return
5.9%inclusion1 decks17 decks
3%synergy
Terminus
5.9%inclusion1 decks17 decks
2%synergy
Glimpse the Unthinkable
5.9%inclusion1 decks17 decks
5%synergy
Idyllic Tutor
5.9%inclusion1 decks17 decks
2%synergy
Treasure Cruise
5.9%inclusion1 decks17 decks
3%synergy
Lórien Revealed
5.9%inclusion1 decks17 decks
3%synergy
Praetor's Grasp
5.9%inclusion1 decks17 decks
3%synergy
Scheming Symmetry
5.9%inclusion1 decks17 decks
4%synergy
Dark Petition
5.9%inclusion1 decks17 decks
5%synergy
Buried Alive
5.9%inclusion1 decks17 decks
2%synergy
Inevitable Betrayal
5.9%inclusion1 decks17 decks
5%synergy
Damn
5.9%inclusion1 decks17 decks
-15%synergy
Transmute Artifact
5.9%inclusion1 decks17 decks
4%synergy
Redress Fate
5.9%inclusion1 decks17 decks
0%synergy
Dance of the Manse
5.9%inclusion1 decks17 decks
2%synergy
Utility Artifacts
The One Ring
76%inclusion13 decks17 decks
63%synergy
Wishclaw Talisman
59%inclusion10 decks17 decks
51%synergy
Mesmeric Orb
18%inclusion3 decks17 decks
17%synergy
Vexing Bauble
18%inclusion3 decks17 decks
16%synergy
Agatha's Soul Cauldron
18%inclusion3 decks17 decks
17%synergy
Sphere of Resistance
5.9%inclusion1 decks17 decks
6%synergy
Sensei's Divining Top
5.9%inclusion1 decks17 decks
-4%synergy
Crucible of Worlds
5.9%inclusion1 decks17 decks
5%synergy
Cursed Totem
5.9%inclusion1 decks17 decks
4%synergy
Ankh of Mishra
5.9%inclusion1 decks17 decks
6%synergy
Altar of the Brood
5.9%inclusion1 decks17 decks
4%synergy
Isochron Scepter
5.9%inclusion1 decks17 decks
4%synergy
Damping Sphere
5.9%inclusion1 decks17 decks
6%synergy
Enchantments
Dance of the Dead
76%inclusion13 decks17 decks
74%synergy
Amphibian Downpour
53%inclusion9 decks17 decks
48%synergy
The Meathook Massacre
47%inclusion8 decks17 decks
44%synergy
Tinybones Joins Up
47%inclusion8 decks17 decks
46%synergy
Blind Obedience
47%inclusion8 decks17 decks
35%synergy
Necropotence
47%inclusion8 decks17 decks
40%synergy
Copy Artifact
41%inclusion7 decks17 decks
40%synergy
Static Prison
41%inclusion7 decks17 decks
41%synergy
Chains of Mephistopheles
41%inclusion7 decks17 decks
41%synergy
Ripples of Undeath
35%inclusion6 decks17 decks
33%synergy
Steal Enchantment
35%inclusion6 decks17 decks
34%synergy
Mirrormade
35%inclusion6 decks17 decks
26%synergy
Seal of Cleansing
29%inclusion5 decks17 decks
28%synergy
Counterbalance
24%inclusion4 decks17 decks
22%synergy
Founding the Third Path
24%inclusion4 decks17 decks
23%synergy
Copy Enchantment
24%inclusion4 decks17 decks
19%synergy
Seal of Removal
24%inclusion4 decks17 decks
23%synergy
Touch the Spirit Realm
18%inclusion3 decks17 decks
15%synergy
Stillness in Motion
13%inclusion1 decks8 decks
12%synergy
Attunement
12%inclusion2 decks17 decks
12%synergy
Dance of Many
12%inclusion2 decks17 decks
12%synergy
Monologue Tax
12%inclusion2 decks17 decks
6%synergy
Chthonian Nightmare
12%inclusion2 decks17 decks
11%synergy
Aura of Silence
12%inclusion2 decks17 decks
8%synergy
Ghostly Prison
12%inclusion2 decks17 decks
-10%synergy
Propaganda
12%inclusion2 decks17 decks
-15%synergy
One with the Multiverse
5.9%inclusion1 decks17 decks
1%synergy
Parallax Wave
5.9%inclusion1 decks17 decks
6%synergy
Unnatural Selection
5.9%inclusion1 decks17 decks
6%synergy
Verity Circle
5.9%inclusion1 decks17 decks
5%synergy
Curse of Silence
5.9%inclusion1 decks17 decks
6%synergy
Parallax Nexus
5.9%inclusion1 decks17 decks
6%synergy
Spirit Mirror
5.9%inclusion1 decks17 decks
6%synergy
Out of the Tombs
5.9%inclusion1 decks17 decks
5%synergy
Chronic Flooding
5.9%inclusion1 decks17 decks
6%synergy
Opalescence
5.9%inclusion1 decks17 decks
5%synergy
Struggle for Project Purity
5.9%inclusion1 decks17 decks
5%synergy
Omniscience
5.9%inclusion1 decks17 decks
2%synergy
Kismet
5.9%inclusion1 decks17 decks
6%synergy
Spirit-Sister's Call
5.9%inclusion1 decks17 decks
5%synergy
Charitable Levy
5.9%inclusion1 decks17 decks
6%synergy
Starfield of Nyx
5.9%inclusion1 decks17 decks
2%synergy
Underworld Dreams
5.9%inclusion1 decks17 decks
5%synergy
The Tale of Tamiyo
5.9%inclusion1 decks17 decks
5%synergy
Power Artifact
5.9%inclusion1 decks17 decks
5%synergy
Cemetery Tampering
5.9%inclusion1 decks17 decks
5%synergy
Leyline of Anticipation
5.9%inclusion1 decks17 decks
1%synergy
Lethal Vapors
5.9%inclusion1 decks17 decks
6%synergy
Second Chance
5.9%inclusion1 decks17 decks
6%synergy
Wound Reflection
5.9%inclusion1 decks17 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
47%inclusion8 decks17 decks
39%synergy
Ashiok, Dream Render
5.9%inclusion1 decks17 decks
4%synergy
Utility Lands
Otawara, Soaring City
88%inclusion15 decks17 decks
69%synergy
Urza's Saga
47%inclusion8 decks17 decks
35%synergy
Serra's Sanctum
35%inclusion6 decks17 decks
34%synergy
Emergence Zone
29%inclusion5 decks17 decks
27%synergy
Cephalid Coliseum
29%inclusion5 decks17 decks
26%synergy
City of Traitors
29%inclusion5 decks17 decks
28%synergy
Bazaar of Baghdad
24%inclusion4 decks17 decks
23%synergy
Minamo, School at Water's Edge
18%inclusion3 decks17 decks
14%synergy
Strip Mine
18%inclusion3 decks17 decks
16%synergy
Wasteland
12%inclusion2 decks17 decks
11%synergy
Hall of Heliod's Generosity
12%inclusion2 decks17 decks
-1%synergy
Urborg, Tomb of Yawgmoth
12%inclusion2 decks17 decks
-1%synergy
Mystic Sanctuary
5.9%inclusion1 decks17 decks
2%synergy
Phyrexian Tower
5.9%inclusion1 decks17 decks
2%synergy
Arcane Lighthouse
5.9%inclusion1 decks17 decks
5%synergy
Crystal Vein
5.9%inclusion1 decks17 decks
6%synergy
Cabal Pit
5.9%inclusion1 decks17 decks
6%synergy
Karn's Bastion
5.9%inclusion1 decks17 decks
5%synergy
Takenuma, Abandoned Mire
5.9%inclusion1 decks17 decks
-1%synergy
Mana Artifacts
Arcane Signet
100%inclusion17 decks17 decks
12%synergy
Sol Ring
100%inclusion17 decks17 decks
10%synergy
Lotus Petal
88%inclusion15 decks17 decks
77%synergy
Mox Diamond
88%inclusion15 decks17 decks
81%synergy
Mox Opal
76%inclusion13 decks17 decks
68%synergy
Talisman of Dominance
71%inclusion12 decks17 decks
21%synergy
Fellwar Stone
71%inclusion12 decks17 decks
37%synergy
Lion's Eye Diamond
65%inclusion11 decks17 decks
63%synergy
Talisman of Progress
53%inclusion9 decks17 decks
10%synergy
Grim Monolith
35%inclusion6 decks17 decks
32%synergy
Talisman of Hierarchy
29%inclusion5 decks17 decks
-14%synergy
Mox Amber
24%inclusion4 decks17 decks
17%synergy
Basalt Monolith
5.9%inclusion1 decks17 decks
4%synergy
Lands
Tundra
100%inclusion17 decks17 decks
84%synergy
Underground Sea
100%inclusion17 decks17 decks
84%synergy
Godless Shrine
100%inclusion17 decks17 decks
50%synergy
Scrubland
100%inclusion17 decks17 decks
84%synergy
Marsh Flats
100%inclusion17 decks17 decks
64%synergy
Polluted Delta
100%inclusion17 decks17 decks
63%synergy
Hallowed Fountain
100%inclusion17 decks17 decks
51%synergy
Flooded Strand
100%inclusion17 decks17 decks
62%synergy
Watery Grave
100%inclusion17 decks17 decks
50%synergy
Command Tower
94%inclusion16 decks17 decks
2%synergy
Misty Rainforest
94%inclusion16 decks17 decks
83%synergy
City of Brass
94%inclusion16 decks17 decks
79%synergy
Verdant Catacombs
88%inclusion15 decks17 decks
78%synergy
Gemstone Caverns
88%inclusion15 decks17 decks
80%synergy
Scalding Tarn
88%inclusion15 decks17 decks
77%synergy
Mana Confluence
88%inclusion15 decks17 decks
74%synergy
Bloodstained Mire
88%inclusion15 decks17 decks
77%synergy
Windswept Heath
76%inclusion13 decks17 decks
67%synergy
Exotic Orchard
65%inclusion11 decks17 decks
6%synergy
Arid Mesa
59%inclusion10 decks17 decks
49%synergy
Undercity Sewers
53%inclusion9 decks17 decks
39%synergy
Starting Town
50%inclusion4 decks8 decks
46%synergy
Morphic Pool
47%inclusion8 decks17 decks
13%synergy
Sea of Clouds
41%inclusion7 decks17 decks
5%synergy
Island
41%inclusion7 decks17 decks
-51%synergy
Vault of Champions
29%inclusion5 decks17 decks
-3%synergy
Swamp
24%inclusion4 decks17 decks
-68%synergy
Cavern of Souls
24%inclusion4 decks17 decks
17%synergy
Talon Gates of Madara
18%inclusion3 decks17 decks
16%synergy
Sink into Stupor
18%inclusion3 decks17 decks
5%synergy
Forbidden Orchard
18%inclusion3 decks17 decks
15%synergy
Spire of Industry
12%inclusion2 decks17 decks
3%synergy
Tarnished Citadel
12%inclusion2 decks17 decks
11%synergy
Raffine's Tower
12%inclusion2 decks17 decks
-29%synergy
Meticulous Archive
12%inclusion2 decks17 decks
-2%synergy
Prismatic Vista
5.9%inclusion1 decks17 decks
2%synergy
Shadowy Backstreet
5.9%inclusion1 decks17 decks
-7%synergy
Prairie Stream
5.9%inclusion1 decks17 decks
-35%synergy
Reflecting Pool
5.9%inclusion1 decks17 decks
-2%synergy
Plains
5.9%inclusion1 decks17 decks
-86%synergy
Gloomlake Verge
5.9%inclusion1 decks17 decks
-5%synergy
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