The Master of Keys (Commander) - Upgraded Control

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 Lands
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Entity Tracker
84%inclusion26 decks31 decks
77%synergy
Ripples of Undeath
77%inclusion24 decks31 decks
75%synergy
Inquisitive Glimmer
81%inclusion25 decks31 decks
73%synergy
Starfield Mystic
74%inclusion23 decks31 decks
67%synergy
Gravebreaker Lamia
65%inclusion20 decks31 decks
64%synergy
Demon of Fate's Design
68%inclusion21 decks31 decks
62%synergy
Dress Down
65%inclusion20 decks31 decks
62%synergy
Hall of Heliod's Generosity
74%inclusion23 decks31 decks
61%synergy
Scrabbling Skullcrab
61%inclusion19 decks31 decks
60%synergy
Animate Dead
68%inclusion21 decks31 decks
58%synergy
Top Cards
Mesa Enchantress
65%inclusion20 decks31 decks
55%synergy
Mystic Remora
61%inclusion19 decks31 decks
40%synergy
Doomwake Giant
61%inclusion19 decks31 decks
55%synergy
Necromancy
58%inclusion18 decks31 decks
53%synergy
Amphibian Downpour
58%inclusion18 decks31 decks
54%synergy
Fear of Impostors
55%inclusion17 decks31 decks
53%synergy
Swords to Plowshares
55%inclusion17 decks31 decks
-13%synergy
Zur, Eternal Schemer
55%inclusion17 decks31 decks
52%synergy
Fear of Sleep Paralysis
52%inclusion16 decks31 decks
46%synergy
Grasp of Fate
48%inclusion15 decks31 decks
42%synergy
Game Changers
Smothering Tithe
39%inclusion12 decks31 decks
6%synergy
Rhystic Study
29%inclusion9 decks31 decks
-3%synergy
Gifts Ungiven
16%inclusion5 decks31 decks
14%synergy
Teferi's Protection
10%inclusion3 decks31 decks
-7%synergy
Consecrated Sphinx
10%inclusion3 decks31 decks
3%synergy
Serra's Sanctum
6.5%inclusion2 decks31 decks
5%synergy
Intuition
6.5%inclusion2 decks31 decks
5%synergy
Enlightened Tutor
6.5%inclusion2 decks31 decks
-14%synergy
Cyclonic Rift
6.5%inclusion2 decks31 decks
-18%synergy
Creatures
Overlord of the Floodpits
48%inclusion15 decks31 decks
45%synergy
Overlord of the Balemurk
45%inclusion14 decks31 decks
43%synergy
Ondu Spiritdancer
45%inclusion14 decks31 decks
39%synergy
Victor, Valgavoth's Seneschal
39%inclusion12 decks31 decks
37%synergy
Heliod, the Radiant Dawn
39%inclusion12 decks31 decks
35%synergy
Silent Hallcreeper
32%inclusion10 decks31 decks
28%synergy
Grim Guardian
32%inclusion10 decks31 decks
30%synergy
Ghostly Dancers
29%inclusion9 decks31 decks
26%synergy
Archon of Sun's Grace
23%inclusion7 decks31 decks
18%synergy
Abdel Adrian, Gorion's Ward
23%inclusion7 decks31 decks
21%synergy
Zur the Enchanter
23%inclusion7 decks31 decks
17%synergy
Sage of Mysteries
19%inclusion6 decks31 decks
19%synergy
Ledger Shredder
19%inclusion6 decks31 decks
10%synergy
Lotho, Corrupt Shirriff
16%inclusion5 decks31 decks
-1%synergy
Enduring Curiosity
16%inclusion5 decks31 decks
9%synergy
Balemurk Leech
16%inclusion5 decks31 decks
15%synergy
Ancient Cellarspawn
16%inclusion5 decks31 decks
13%synergy
Hullbreaker Horror
16%inclusion5 decks31 decks
10%synergy
Stenn, Paranoid Partisan
13%inclusion4 decks31 decks
11%synergy
Lurrus of the Dream-Den
13%inclusion4 decks31 decks
11%synergy
Valley Floodcaller
13%inclusion4 decks31 decks
9%synergy
Moon-Blessed Cleric
13%inclusion4 decks31 decks
8%synergy
Skullsnap Nuisance
13%inclusion4 decks31 decks
12%synergy
Athreos, Shroud-Veiled
13%inclusion4 decks31 decks
8%synergy
Aminatou, Veil Piercer
13%inclusion4 decks31 decks
11%synergy
Mindwrack Harpy
13%inclusion4 decks31 decks
13%synergy
Fear of Infinity
10%inclusion3 decks31 decks
9%synergy
Soaring Lightbringer
10%inclusion3 decks31 decks
5%synergy
Overlord of the Mistmoors
10%inclusion3 decks31 decks
7%synergy
Archetype of Imagination
10%inclusion3 decks31 decks
5%synergy
Neerdiv, Devious Diver
10%inclusion3 decks31 decks
10%synergy
Toxrill, the Corrosive
10%inclusion3 decks31 decks
7%synergy
Emet-Selch of the Third Seat
8.0%inclusion2 decks25 decks
-2%synergy
Starnheim Courser
6.5%inclusion2 decks31 decks
2%synergy
Witch Enchanter
6.5%inclusion2 decks31 decks
0%synergy
Eidolon of Rhetoric
6.5%inclusion2 decks31 decks
5%synergy
Gray Merchant of Asphodel
6.5%inclusion2 decks31 decks
2%synergy
Heliod, Sun-Crowned
6.5%inclusion2 decks31 decks
3%synergy
Archetype of Courage
6.5%inclusion2 decks31 decks
5%synergy
Vilis, Broker of Blood
6.5%inclusion2 decks31 decks
5%synergy
Leonin Relic-Warder
6.5%inclusion2 decks31 decks
6%synergy
Spirited Companion
6.5%inclusion2 decks31 decks
4%synergy
Deranged Assistant
6.5%inclusion2 decks31 decks
6%synergy
Nashi, Searcher in the Dark
6.5%inclusion2 decks31 decks
6%synergy
Athreos, God of Passage
6.5%inclusion2 decks31 decks
5%synergy
Nightmare Shepherd
6.5%inclusion2 decks31 decks
4%synergy
Nezahal, Primal Tide
6.5%inclusion2 decks31 decks
3%synergy
Valgavoth, Terror Eater
6.5%inclusion2 decks31 decks
3%synergy
Instants
An Offer You Can't Refuse
48%inclusion15 decks31 decks
22%synergy
Arcane Denial
42%inclusion13 decks31 decks
22%synergy
Counterspell
35%inclusion11 decks31 decks
-6%synergy
Entomb
29%inclusion9 decks31 decks
22%synergy
Swan Song
29%inclusion9 decks31 decks
10%synergy
Path to Exile
26%inclusion8 decks31 decks
-16%synergy
Void Rend
23%inclusion7 decks31 decks
-11%synergy
Sink into Stupor
23%inclusion7 decks31 decks
10%synergy
Negate
19%inclusion6 decks31 decks
3%synergy
Thirst for Meaning
19%inclusion6 decks31 decks
18%synergy
Mana Drain
19%inclusion6 decks31 decks
2%synergy
Inkshield
19%inclusion6 decks31 decks
10%synergy
Fact or Fiction
16%inclusion5 decks31 decks
12%synergy
Dovin's Veto
13%inclusion4 decks31 decks
-12%synergy
Dark Ritual
13%inclusion4 decks31 decks
-6%synergy
Anguished Unmaking
13%inclusion4 decks31 decks
-12%synergy
Generous Gift
13%inclusion4 decks31 decks
-2%synergy
Fell the Profane
10%inclusion3 decks31 decks
1%synergy
Strix Serenade
10%inclusion3 decks31 decks
6%synergy
Faithful Mending
10%inclusion3 decks31 decks
6%synergy
Frantic Search
6.5%inclusion2 decks31 decks
-11%synergy
Brainstorm
6.5%inclusion2 decks31 decks
-11%synergy
Dawn's Truce
6.5%inclusion2 decks31 decks
2%synergy
Lim-Dûl's Vault
6.5%inclusion2 decks31 decks
3%synergy
Flare of Fortitude
6.5%inclusion2 decks31 decks
4%synergy
Jwari Disruption
6.5%inclusion2 decks31 decks
6%synergy
Delay
6.5%inclusion2 decks31 decks
4%synergy
Utter End
6.5%inclusion2 decks31 decks
-1%synergy
Drown in Dreams
6.5%inclusion2 decks31 decks
6%synergy
Pact of Negation
6.5%inclusion2 decks31 decks
-2%synergy
Sorceries
Sevinne's Reclamation
45%inclusion14 decks31 decks
36%synergy
Redress Fate
26%inclusion8 decks31 decks
20%synergy
Supreme Verdict
23%inclusion7 decks31 decks
8%synergy
Reanimate
23%inclusion7 decks31 decks
7%synergy
Windfall
19%inclusion6 decks31 decks
6%synergy
Toxic Deluge
19%inclusion6 decks31 decks
0%synergy
Damn
19%inclusion6 decks31 decks
-1%synergy
Extinguish All Hope
19%inclusion6 decks31 decks
18%synergy
Dance of the Manse
19%inclusion6 decks31 decks
16%synergy
Wrath of God
16%inclusion5 decks31 decks
12%synergy
Glimpse the Unthinkable
16%inclusion5 decks31 decks
16%synergy
Idyllic Tutor
16%inclusion5 decks31 decks
12%synergy
Resurgent Belief
13%inclusion4 decks31 decks
11%synergy
Farewell
13%inclusion4 decks31 decks
0%synergy
Traumatize
13%inclusion4 decks31 decks
12%synergy
Time Wipe
10%inclusion3 decks31 decks
3%synergy
Demonic Counsel
10%inclusion3 decks31 decks
9%synergy
Buried Alive
10%inclusion3 decks31 decks
6%synergy
Space-Time Anomaly
9.1%inclusion2 decks22 decks
7%synergy
Ponder
6.5%inclusion2 decks31 decks
-3%synergy
Ondu Inversion
6.5%inclusion2 decks31 decks
5%synergy
Open the Vaults
6.5%inclusion2 decks31 decks
5%synergy
Cut Your Losses
6.5%inclusion2 decks31 decks
6%synergy
Slaughter the Strong
6.5%inclusion2 decks31 decks
6%synergy
Night's Whisper
6.5%inclusion2 decks31 decks
4%synergy
Brilliant Restoration
6.5%inclusion2 decks31 decks
4%synergy
Breach the Multiverse
6.5%inclusion2 decks31 decks
4%synergy
Compulsive Research
6.5%inclusion2 decks31 decks
6%synergy
Utility Artifacts
Mesmeric Orb
32%inclusion10 decks31 decks
31%synergy
Lightning Greaves
23%inclusion7 decks31 decks
0%synergy
Cloud Key
10%inclusion3 decks31 decks
6%synergy
Whip of Erebos
10%inclusion3 decks31 decks
8%synergy
Swiftfoot Boots
10%inclusion3 decks31 decks
-14%synergy
Crucible of Worlds
6.5%inclusion2 decks31 decks
6%synergy
Mask of the Schemer
6.5%inclusion2 decks31 decks
5%synergy
Palantír of Orthanc
6.5%inclusion2 decks31 decks
5%synergy
Wishclaw Talisman
6.5%inclusion2 decks31 decks
-2%synergy
Enchantments
Sphere of Safety
48%inclusion15 decks31 decks
39%synergy
Secret Arcade // Dusty Parlor
48%inclusion15 decks31 decks
43%synergy
Ghostly Prison
48%inclusion15 decks31 decks
27%synergy
Propaganda
48%inclusion15 decks31 decks
22%synergy
Sigil of the Empty Throne
45%inclusion14 decks31 decks
39%synergy
Cemetery Tampering
45%inclusion14 decks31 decks
44%synergy
Dance of the Dead
42%inclusion13 decks31 decks
40%synergy
Blind Obedience
42%inclusion13 decks31 decks
30%synergy
Mirrormade
42%inclusion13 decks31 decks
32%synergy
Out of the Tombs
39%inclusion12 decks31 decks
38%synergy
Estrid's Invocation
39%inclusion12 decks31 decks
34%synergy
Seal of Cleansing
39%inclusion12 decks31 decks
37%synergy
The Tale of Tamiyo
35%inclusion11 decks31 decks
35%synergy
The Meathook Massacre
32%inclusion10 decks31 decks
29%synergy
Cacophony Unleashed
32%inclusion10 decks31 decks
31%synergy
Starfield of Nyx
32%inclusion10 decks31 decks
28%synergy
Ethereal Armor
32%inclusion10 decks31 decks
28%synergy
Darksteel Mutation
29%inclusion9 decks31 decks
23%synergy
Touch the Spirit Realm
29%inclusion9 decks31 decks
26%synergy
Timely Ward
29%inclusion9 decks31 decks
24%synergy
Defiled Crypt // Cadaver Lab
29%inclusion9 decks31 decks
28%synergy
Authority of the Consuls
26%inclusion8 decks31 decks
15%synergy
Hallowed Haunting
26%inclusion8 decks31 decks
23%synergy
Seal of Removal
26%inclusion8 decks31 decks
25%synergy
Trouble in Pairs
26%inclusion8 decks31 decks
20%synergy
Imprisoned in the Moon
23%inclusion7 decks31 decks
16%synergy
Extravagant Replication
23%inclusion7 decks31 decks
18%synergy
Copy Enchantment
23%inclusion7 decks31 decks
18%synergy
Black Market Connections
23%inclusion7 decks31 decks
9%synergy
Land Tax
23%inclusion7 decks31 decks
16%synergy
Stillness in Motion
21%inclusion6 decks28 decks
21%synergy
One with the Multiverse
19%inclusion6 decks31 decks
15%synergy
Monologue Tax
19%inclusion6 decks31 decks
13%synergy
Static Prison
19%inclusion6 decks31 decks
19%synergy
Secrets of the Dead
19%inclusion6 decks31 decks
19%synergy
Sheltered by Ghosts
19%inclusion6 decks31 decks
17%synergy
Solitary Confinement
19%inclusion6 decks31 decks
17%synergy
Nowhere to Run
19%inclusion6 decks31 decks
18%synergy
Greater Auramancy
19%inclusion6 decks31 decks
15%synergy
Aura of Silence
19%inclusion6 decks31 decks
16%synergy
Phyrexian Arena
19%inclusion6 decks31 decks
5%synergy
Teval's Judgment
18%inclusion5 decks28 decks
17%synergy
Tinybones Joins Up
16%inclusion5 decks31 decks
15%synergy
Shark Typhoon
16%inclusion5 decks31 decks
10%synergy
Leyline of Anticipation
16%inclusion5 decks31 decks
12%synergy
Bottomless Pool // Locker Room
16%inclusion5 decks31 decks
14%synergy
Oubliette
16%inclusion5 decks31 decks
15%synergy
Polluted Cistern // Dim Oubliette
16%inclusion5 decks31 decks
16%synergy
Virtue of Persistence
16%inclusion5 decks31 decks
14%synergy
Smuggler's Share
13%inclusion4 decks31 decks
11%synergy
Utility Lands
Bojuka Bog
39%inclusion12 decks31 decks
11%synergy
Cephalid Coliseum
32%inclusion10 decks31 decks
29%synergy
Otawara, Soaring City
26%inclusion8 decks31 decks
7%synergy
Takenuma, Abandoned Mire
13%inclusion4 decks31 decks
6%synergy
Ishgard, the Holy See
12%inclusion3 decks25 decks
8%synergy
Geier Reach Sanitarium
10%inclusion3 decks31 decks
5%synergy
Urborg, Tomb of Yawgmoth
10%inclusion3 decks31 decks
-4%synergy
Minamo, School at Water's Edge
6.5%inclusion2 decks31 decks
2%synergy
Urza's Saga
6.5%inclusion2 decks31 decks
-5%synergy
Nephalia Drownyard
6.5%inclusion2 decks31 decks
6%synergy
Emergence Zone
6.5%inclusion2 decks31 decks
4%synergy
Eiganjo, Seat of the Empire
6.5%inclusion2 decks31 decks
1%synergy
Reliquary Tower
6.5%inclusion2 decks31 decks
-27%synergy
Temple of the False God
6.5%inclusion2 decks31 decks
-1%synergy
Vault of the Archangel
6.5%inclusion2 decks31 decks
0%synergy
Rogue's Passage
6.5%inclusion2 decks31 decks
-3%synergy
Mana Artifacts
Sol Ring
90%inclusion28 decks31 decks
0%synergy
Arcane Signet
87%inclusion27 decks31 decks
-1%synergy
Talisman of Progress
58%inclusion18 decks31 decks
15%synergy
Talisman of Hierarchy
55%inclusion17 decks31 decks
12%synergy
Talisman of Dominance
52%inclusion16 decks31 decks
3%synergy
Fellwar Stone
29%inclusion9 decks31 decks
-5%synergy
Orzhov Signet
29%inclusion9 decks31 decks
-6%synergy
Azorius Signet
26%inclusion8 decks31 decks
-7%synergy
Dimir Signet
19%inclusion6 decks31 decks
-13%synergy
Chromatic Lantern
6.5%inclusion2 decks31 decks
-7%synergy
Mind Stone
6.5%inclusion2 decks31 decks
-7%synergy
Lands
Command Tower
97%inclusion30 decks31 decks
4%synergy
Swamp
94%inclusion29 decks31 decks
2%synergy
Island
94%inclusion29 decks31 decks
1%synergy
Plains
94%inclusion29 decks31 decks
2%synergy
Exotic Orchard
61%inclusion19 decks31 decks
3%synergy
Caves of Koilos
61%inclusion19 decks31 decks
26%synergy
Godless Shrine
58%inclusion18 decks31 decks
8%synergy
Underground River
58%inclusion18 decks31 decks
26%synergy
Adarkar Wastes
58%inclusion18 decks31 decks
27%synergy
Flooded Strand
55%inclusion17 decks31 decks
17%synergy
Watery Grave
55%inclusion17 decks31 decks
5%synergy
Hallowed Fountain
52%inclusion16 decks31 decks
3%synergy
Arcane Sanctum
48%inclusion15 decks31 decks
-6%synergy
Isolated Chapel
48%inclusion15 decks31 decks
10%synergy
Polluted Delta
48%inclusion15 decks31 decks
11%synergy
Undercity Sewers
45%inclusion14 decks31 decks
31%synergy
Meticulous Archive
45%inclusion14 decks31 decks
32%synergy
Marsh Flats
45%inclusion14 decks31 decks
9%synergy
Morphic Pool
42%inclusion13 decks31 decks
8%synergy
Shadowy Backstreet
39%inclusion12 decks31 decks
26%synergy
Sea of Clouds
39%inclusion12 decks31 decks
3%synergy
Glacial Fortress
35%inclusion11 decks31 decks
-4%synergy
Raffine's Tower
35%inclusion11 decks31 decks
-6%synergy
Drowned Catacomb
35%inclusion11 decks31 decks
0%synergy
Vault of Champions
35%inclusion11 decks31 decks
3%synergy
Prairie Stream
32%inclusion10 decks31 decks
-8%synergy
Temple of Silence
32%inclusion10 decks31 decks
12%synergy
Deserted Beach
32%inclusion10 decks31 decks
11%synergy
Temple of Deceit
29%inclusion9 decks31 decks
11%synergy
Temple of Enlightenment
29%inclusion9 decks31 decks
12%synergy
Sunken Hollow
29%inclusion9 decks31 decks
-11%synergy
Terramorphic Expanse
26%inclusion8 decks31 decks
9%synergy
Shipwreck Marsh
26%inclusion8 decks31 decks
5%synergy
Valgavoth's Lair
26%inclusion8 decks31 decks
23%synergy
Evolving Wilds
26%inclusion8 decks31 decks
1%synergy
Gloomlake Verge
26%inclusion8 decks31 decks
15%synergy
Obscura Storefront
26%inclusion8 decks31 decks
15%synergy
Contaminated Landscape
23%inclusion7 decks31 decks
8%synergy
Sink into Stupor
23%inclusion7 decks31 decks
10%synergy
Floodfarm Verge
23%inclusion7 decks31 decks
11%synergy
Tainted Isle
19%inclusion6 decks31 decks
13%synergy
Fetid Heath
19%inclusion6 decks31 decks
8%synergy
Tainted Field
19%inclusion6 decks31 decks
12%synergy
Ash Barrens
19%inclusion6 decks31 decks
9%synergy
Shattered Sanctum
19%inclusion6 decks31 decks
3%synergy
Mana Confluence
19%inclusion6 decks31 decks
6%synergy
Tundra
16%inclusion5 decks31 decks
0%synergy
Azorius Chancery
16%inclusion5 decks31 decks
2%synergy
Bleachbone Verge
16%inclusion5 decks31 decks
8%synergy
Underground Sea
16%inclusion5 decks31 decks
0%synergy
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