The Master of Keys (Commander) - Upgraded

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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Instants
Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
5.3%inclusion8 decks150 decks
5%synergy
Twilight Diviner
4.0%inclusion6 decks150 decks
3%synergy
Mornsong Aria
3.2%inclusion5 decks157 decks
2%synergy
Grave Venerations
1.9%inclusion3 decks156 decks
2%synergy
Paramecia Coloniex
1.4%inclusion1 decks74 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
78%inclusion386 decks493 decks
71%synergy
Ripples of Undeath
73%inclusion359 decks493 decks
70%synergy
Entity Tracker
70%inclusion344 decks493 decks
64%synergy
Starfield Mystic
66%inclusion324 decks493 decks
59%synergy
Animate Dead
67%inclusion332 decks493 decks
58%synergy
Gravebreaker Lamia
58%inclusion287 decks493 decks
57%synergy
Mesa Enchantress
66%inclusion326 decks493 decks
57%synergy
Demon of Fate's Design
60%inclusion295 decks493 decks
54%synergy
Scrabbling Skullcrab
53%inclusion262 decks493 decks
52%synergy
Hall of Heliod's Generosity
65%inclusion320 decks493 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
55%inclusion273 decks493 decks
50%synergy
Doomwake Giant
55%inclusion271 decks493 decks
49%synergy
Mystic Remora
54%inclusion264 decks493 decks
33%synergy
Dress Down
54%inclusion264 decks493 decks
51%synergy
Sphere of Safety
53%inclusion259 decks493 decks
43%synergy
Necromancy
52%inclusion258 decks493 decks
48%synergy
Overlord of the Floodpits
51%inclusion253 decks493 decks
48%synergy
Swords to Plowshares
51%inclusion253 decks493 decks
-17%synergy
Secret Arcade // Dusty Parlor
49%inclusion243 decks493 decks
45%synergy
Mirrormade
49%inclusion241 decks493 decks
39%synergy
Game Changers
Smothering Tithe
38%inclusion185 decks493 decks
6%synergy
Rhystic Study
28%inclusion140 decks493 decks
-3%synergy
Enlightened Tutor
12%inclusion57 decks493 decks
-8%synergy
Gifts Ungiven
8.9%inclusion44 decks493 decks
6%synergy
Necropotence
6.9%inclusion34 decks493 decks
0%synergy
Serra's Sanctum
6.5%inclusion32 decks493 decks
5%synergy
Demonic Tutor
5.9%inclusion29 decks493 decks
-15%synergy
Farewell
5.9%inclusion29 decks493 decks
-7%synergy
Cyclonic Rift
5.9%inclusion29 decks493 decks
-18%synergy
Teferi's Protection
5.3%inclusion26 decks493 decks
-11%synergy
Creatures
Overlord of the Balemurk
47%inclusion234 decks493 decks
46%synergy
Ondu Spiritdancer
46%inclusion227 decks493 decks
40%synergy
Fear of Impostors
44%inclusion217 decks493 decks
43%synergy
Zur, Eternal Schemer
44%inclusion217 decks493 decks
41%synergy
Victor, Valgavoth's Seneschal
43%inclusion214 decks493 decks
41%synergy
Silent Hallcreeper
34%inclusion167 decks493 decks
29%synergy
Zur the Enchanter
34%inclusion166 decks493 decks
28%synergy
Ghostly Dancers
31%inclusion152 decks493 decks
28%synergy
Enduring Curiosity
27%inclusion132 decks493 decks
19%synergy
Heliod, the Radiant Dawn
26%inclusion126 decks493 decks
22%synergy
Moon-Blessed Cleric
24%inclusion118 decks493 decks
19%synergy
Soaring Lightbringer
24%inclusion117 decks493 decks
19%synergy
Grim Guardian
24%inclusion116 decks493 decks
21%synergy
Archon of Sun's Grace
22%inclusion107 decks493 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion99 decks493 decks
18%synergy
Sage of Mysteries
18%inclusion89 decks493 decks
18%synergy
Aminatou, Veil Piercer
17%inclusion86 decks493 decks
16%synergy
Overlord of the Mistmoors
16%inclusion80 decks493 decks
14%synergy
Mindwrack Harpy
16%inclusion77 decks493 decks
15%synergy
Athreos, Shroud-Veiled
13%inclusion65 decks493 decks
9%synergy
Balemurk Leech
13%inclusion65 decks493 decks
13%synergy
Alseid of Life's Bounty
13%inclusion65 decks493 decks
12%synergy
Archetype of Imagination
13%inclusion64 decks493 decks
8%synergy
Lotho, Corrupt Shirriff
13%inclusion62 decks493 decks
-4%synergy
Ancient Cellarspawn
12%inclusion61 decks493 decks
9%synergy
Hedron Crab
12%inclusion61 decks493 decks
12%synergy
Hullbreaker Horror
12%inclusion58 decks493 decks
6%synergy
Esper Sentinel
11%inclusion55 decks493 decks
-16%synergy
Ledger Shredder
11%inclusion53 decks493 decks
2%synergy
Witch Enchanter
10%inclusion49 decks493 decks
3%synergy
Nashi, Searcher in the Dark
10%inclusion49 decks493 decks
9%synergy
Sun Titan
10%inclusion49 decks493 decks
2%synergy
Skullsnap Nuisance
10%inclusion47 decks493 decks
9%synergy
Gremlin Tamer
9.3%inclusion46 decks493 decks
8%synergy
Lurrus of the Dream-Den
8.9%inclusion44 decks493 decks
7%synergy
Spirited Companion
8.1%inclusion40 decks493 decks
6%synergy
Solemn Simulacrum
7.5%inclusion37 decks493 decks
-7%synergy
Summon: Yojimbo
6.9%inclusion26 decks375 decks
6%synergy
Auramancer
6.9%inclusion34 decks493 decks
4%synergy
Stenn, Paranoid Partisan
6.7%inclusion33 decks493 decks
5%synergy
Nightmare Shepherd
6.7%inclusion33 decks493 decks
4%synergy
Valley Floodcaller
6.7%inclusion33 decks493 decks
3%synergy
Valgavoth, Terror Eater
6.7%inclusion33 decks493 decks
3%synergy
Emet-Selch of the Third Seat
6.6%inclusion25 decks378 decks
-3%synergy
Grand Abolisher
6.5%inclusion32 decks493 decks
-8%synergy
Laboratory Maniac
6.3%inclusion31 decks493 decks
3%synergy
Starnheim Courser
6.1%inclusion30 decks493 decks
2%synergy
Summon: Bahamut
6.1%inclusion23 decks378 decks
5%synergy
Stitcher's Supplier
5.9%inclusion29 decks493 decks
5%synergy
Summon: Primal Odin
5.8%inclusion22 decks378 decks
2%synergy
Instants
Counterspell
35%inclusion175 decks493 decks
-6%synergy
Arcane Denial
32%inclusion159 decks493 decks
12%synergy
An Offer You Can't Refuse
29%inclusion142 decks493 decks
2%synergy
Entomb
28%inclusion136 decks493 decks
21%synergy
Path to Exile
26%inclusion126 decks493 decks
-17%synergy
Dark Ritual
25%inclusion124 decks493 decks
6%synergy
Void Rend
19%inclusion94 decks493 decks
-15%synergy
Inkshield
17%inclusion85 decks493 decks
8%synergy
Frantic Search
16%inclusion80 decks493 decks
-2%synergy
Dovin's Veto
16%inclusion80 decks493 decks
-9%synergy
Swan Song
16%inclusion79 decks493 decks
-4%synergy
Thirst for Meaning
16%inclusion79 decks493 decks
15%synergy
Sink into Stupor
14%inclusion69 decks493 decks
1%synergy
Negate
13%inclusion65 decks493 decks
-3%synergy
Otherworldly Gaze
13%inclusion63 decks493 decks
11%synergy
Mana Drain
12%inclusion57 decks493 decks
-6%synergy
Fell the Profane
11%inclusion56 decks493 decks
3%synergy
Brainstorm
11%inclusion54 decks493 decks
-6%synergy
Anguished Unmaking
8.7%inclusion43 decks493 decks
-17%synergy
Fact or Fiction
6.7%inclusion33 decks493 decks
3%synergy
Utter End
6.1%inclusion30 decks493 decks
0%synergy
Faithful Mending
5.7%inclusion28 decks493 decks
2%synergy
Waterlogged Teachings
5.5%inclusion27 decks493 decks
1%synergy
Generous Gift
5.5%inclusion27 decks493 decks
-9%synergy
Return to Dust
5.3%inclusion26 decks493 decks
2%synergy
Cabal Ritual
5.1%inclusion25 decks493 decks
2%synergy
Sorceries
Sevinne's Reclamation
46%inclusion227 decks493 decks
37%synergy
Redress Fate
34%inclusion168 decks493 decks
28%synergy
Windfall
25%inclusion121 decks493 decks
11%synergy
Singularity Rupture
22%inclusion74 decks331 decks
20%synergy
Reanimate
22%inclusion109 decks493 decks
6%synergy
Extinguish All Hope
19%inclusion94 decks493 decks
17%synergy
Dance of the Manse
17%inclusion85 decks493 decks
14%synergy
Time Wipe
15%inclusion73 decks493 decks
8%synergy
Damn
15%inclusion72 decks493 decks
-6%synergy
Glimpse the Unthinkable
14%inclusion70 decks493 decks
14%synergy
Toxic Deluge
14%inclusion67 decks493 decks
-6%synergy
Idyllic Tutor
14%inclusion67 decks493 decks
9%synergy
Supreme Verdict
11%inclusion56 decks493 decks
-3%synergy
Resurgent Belief
11%inclusion56 decks493 decks
9%synergy
Space-Time Anomaly
10%inclusion34 decks326 decks
9%synergy
Demonic Counsel
10%inclusion49 decks493 decks
9%synergy
Replenish
9.1%inclusion45 decks493 decks
7%synergy
Buried Alive
9.1%inclusion45 decks493 decks
5%synergy
Unmarked Grave
7.9%inclusion39 decks493 decks
7%synergy
Ponder
7.5%inclusion37 decks493 decks
-2%synergy
Lively Dirge
6.7%inclusion33 decks493 decks
5%synergy
Austere Command
5.9%inclusion29 decks493 decks
-3%synergy
Open the Vaults
5.1%inclusion25 decks493 decks
4%synergy
Utility Artifacts
Mesmeric Orb
19%inclusion93 decks493 decks
18%synergy
Cloud Key
13%inclusion64 decks493 decks
10%synergy
Lightning Greaves
8.7%inclusion43 decks493 decks
-14%synergy
Wayfarer's Bauble
7.5%inclusion37 decks493 decks
0%synergy
Swiftfoot Boots
5.9%inclusion29 decks493 decks
-18%synergy
Enchantments
Amphibian Downpour
47%inclusion234 decks493 decks
43%synergy
Propaganda
44%inclusion218 decks493 decks
16%synergy
Grasp of Fate
43%inclusion212 decks493 decks
37%synergy
Seal of Cleansing
42%inclusion207 decks493 decks
41%synergy
Sigil of the Empty Throne
40%inclusion199 decks493 decks
35%synergy
Cemetery Tampering
39%inclusion193 decks493 decks
38%synergy
Ghostly Prison
38%inclusion185 decks493 decks
15%synergy
Estrid's Invocation
36%inclusion178 decks493 decks
31%synergy
Blind Obedience
34%inclusion167 decks493 decks
22%synergy
Starfield of Nyx
33%inclusion163 decks493 decks
29%synergy
Cacophony Unleashed
32%inclusion157 decks493 decks
30%synergy
Monologue Tax
31%inclusion155 decks493 decks
25%synergy
Dance of the Dead
29%inclusion144 decks493 decks
27%synergy
The Tale of Tamiyo
27%inclusion131 decks493 decks
26%synergy
Stillness in Motion
24%inclusion105 decks431 decks
24%synergy
Darksteel Mutation
24%inclusion120 decks493 decks
18%synergy
Seal of Removal
24%inclusion116 decks493 decks
23%synergy
The Meathook Massacre
23%inclusion113 decks493 decks
20%synergy
Phyrexian Arena
23%inclusion112 decks493 decks
9%synergy
Imprisoned in the Moon
23%inclusion111 decks493 decks
16%synergy
Timely Ward
22%inclusion108 decks493 decks
17%synergy
Sheltered by Ghosts
22%inclusion106 decks493 decks
19%synergy
Extravagant Replication
21%inclusion105 decks493 decks
16%synergy
Defiled Crypt // Cadaver Lab
21%inclusion103 decks493 decks
20%synergy
Shark Typhoon
21%inclusion103 decks493 decks
15%synergy
Greater Auramancy
20%inclusion100 decks493 decks
16%synergy
Polluted Cistern // Dim Oubliette
20%inclusion98 decks493 decks
19%synergy
Ethereal Armor
20%inclusion98 decks493 decks
15%synergy
All That Glitters
20%inclusion97 decks493 decks
11%synergy
Black Market Connections
20%inclusion97 decks493 decks
5%synergy
Out of the Tombs
19%inclusion96 decks493 decks
19%synergy
Copy Enchantment
19%inclusion92 decks493 decks
14%synergy
Touch the Spirit Realm
17%inclusion85 decks493 decks
15%synergy
Hallowed Haunting
17%inclusion85 decks493 decks
15%synergy
Leyline of Anticipation
17%inclusion82 decks493 decks
12%synergy
Authority of the Consuls
17%inclusion82 decks493 decks
4%synergy
Restricted Office // Lecture Hall
16%inclusion81 decks493 decks
14%synergy
The Eldest Reborn
16%inclusion80 decks493 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion80 decks493 decks
14%synergy
Bottomless Pool // Locker Room
16%inclusion78 decks493 decks
14%synergy
Static Prison
15%inclusion75 decks493 decks
15%synergy
Court of Cunning
14%inclusion69 decks493 decks
13%synergy
Secrets of the Dead
14%inclusion69 decks493 decks
14%synergy
Land Tax
14%inclusion69 decks493 decks
8%synergy
Teval's Judgment
14%inclusion61 decks437 decks
13%synergy
Central Elevator // Promising Stairs
14%inclusion67 decks493 decks
13%synergy
Oubliette
14%inclusion67 decks493 decks
12%synergy
One with the Multiverse
13%inclusion66 decks493 decks
9%synergy
Nowhere to Run
13%inclusion66 decks493 decks
12%synergy
Cramped Vents // Access Maze
13%inclusion63 decks493 decks
10%synergy
Battles
Invasion of Theros
7.3%inclusion36 decks493 decks
6%synergy
Utility Lands
Bojuka Bog
43%inclusion214 decks493 decks
16%synergy
Cephalid Coliseum
19%inclusion92 decks493 decks
15%synergy
Otawara, Soaring City
17%inclusion86 decks493 decks
-2%synergy
Takenuma, Abandoned Mire
15%inclusion76 decks493 decks
9%synergy
Reliquary Tower
13%inclusion62 decks493 decks
-21%synergy
Halimar Depths
11%inclusion54 decks493 decks
6%synergy
Urborg, Tomb of Yawgmoth
7.1%inclusion35 decks493 decks
-6%synergy
Urza's Saga
5.9%inclusion29 decks493 decks
-6%synergy
Rogue's Passage
5.5%inclusion27 decks493 decks
-4%synergy
Adagia, Windswept Bastion
5.4%inclusion18 decks331 decks
3%synergy
Mana Artifacts
Sol Ring
89%inclusion437 decks493 decks
-1%synergy
Arcane Signet
88%inclusion433 decks493 decks
0%synergy
Talisman of Progress
51%inclusion253 decks493 decks
8%synergy
Talisman of Dominance
51%inclusion249 decks493 decks
1%synergy
Talisman of Hierarchy
46%inclusion225 decks493 decks
2%synergy
Azorius Signet
40%inclusion198 decks493 decks
9%synergy
Orzhov Signet
38%inclusion187 decks493 decks
5%synergy
Fellwar Stone
33%inclusion162 decks493 decks
-1%synergy
Dimir Signet
28%inclusion138 decks493 decks
-3%synergy
Mind Stone
15%inclusion72 decks493 decks
2%synergy
Commander's Sphere
12%inclusion60 decks493 decks
-6%synergy
Chromatic Lantern
6.1%inclusion30 decks493 decks
-7%synergy
Lands
Island
97%inclusion478 decks493 decks
4%synergy
Swamp
97%inclusion477 decks493 decks
5%synergy
Command Tower
96%inclusion475 decks493 decks
4%synergy
Plains
96%inclusion475 decks493 decks
5%synergy
Arcane Sanctum
62%inclusion306 decks493 decks
8%synergy
Caves of Koilos
62%inclusion305 decks493 decks
26%synergy
Adarkar Wastes
58%inclusion288 decks493 decks
27%synergy
Watery Grave
54%inclusion265 decks493 decks
3%synergy
Godless Shrine
53%inclusion263 decks493 decks
2%synergy
Exotic Orchard
53%inclusion261 decks493 decks
-6%synergy
Underground River
53%inclusion260 decks493 decks
19%synergy
Hallowed Fountain
51%inclusion253 decks493 decks
1%synergy
Polluted Delta
43%inclusion214 decks493 decks
6%synergy
Flooded Strand
43%inclusion214 decks493 decks
5%synergy
Raffine's Tower
43%inclusion211 decks493 decks
2%synergy
Glacial Fortress
40%inclusion198 decks493 decks
-2%synergy
Isolated Chapel
40%inclusion195 decks493 decks
-1%synergy
Marsh Flats
37%inclusion183 decks493 decks
1%synergy
Drowned Catacomb
35%inclusion172 decks493 decks
-2%synergy
Prairie Stream
35%inclusion171 decks493 decks
-6%synergy
Valgavoth's Lair
34%inclusion166 decks493 decks
31%synergy
Sunken Hollow
33%inclusion165 decks493 decks
-6%synergy
Sea of Clouds
33%inclusion163 decks493 decks
-2%synergy
Meticulous Archive
33%inclusion161 decks493 decks
19%synergy
Undercity Sewers
31%inclusion155 decks493 decks
17%synergy
Vault of Champions
31%inclusion154 decks493 decks
-1%synergy
Shadowy Backstreet
30%inclusion149 decks493 decks
18%synergy
Morphic Pool
29%inclusion142 decks493 decks
-5%synergy
Floodfarm Verge
28%inclusion139 decks493 decks
17%synergy
Azorius Chancery
27%inclusion135 decks493 decks
14%synergy
Terramorphic Expanse
27%inclusion131 decks493 decks
10%synergy
Evolving Wilds
26%inclusion129 decks493 decks
1%synergy
Temple of Silence
25%inclusion124 decks493 decks
6%synergy
Temple of Enlightenment
24%inclusion120 decks493 decks
8%synergy
Orzhov Basilica
24%inclusion118 decks493 decks
9%synergy
Obscura Storefront
24%inclusion117 decks493 decks
14%synergy
Tainted Field
24%inclusion116 decks493 decks
17%synergy
Deserted Beach
24%inclusion116 decks493 decks
3%synergy
Dimir Aqueduct
23%inclusion114 decks493 decks
10%synergy
Gloomlake Verge
23%inclusion114 decks493 decks
12%synergy
Temple of Deceit
23%inclusion111 decks493 decks
5%synergy
Shipwreck Marsh
22%inclusion107 decks493 decks
1%synergy
Contaminated Landscape
22%inclusion106 decks493 decks
8%synergy
Tainted Isle
21%inclusion103 decks493 decks
15%synergy
Ash Barrens
17%inclusion86 decks493 decks
7%synergy
Shattered Sanctum
16%inclusion80 decks493 decks
0%synergy
Path of Ancestry
15%inclusion76 decks493 decks
-12%synergy
Sink into Stupor
14%inclusion69 decks493 decks
1%synergy
Darkwater Catacombs
14%inclusion67 decks493 decks
-1%synergy
Skycloud Expanse
13%inclusion65 decks493 decks
-2%synergy
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