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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Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
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Noggle the Mind
5.7%inclusion5 decks88 decks
5%synergy
Twilight Diviner
5.7%inclusion5 decks88 decks
5%synergy
Mornsong Aria
2.1%inclusion2 decks95 decks
1%synergy
Thirst for Identity
1.1%inclusion1 decks88 decks
0%synergy
Grave Venerations
1.1%inclusion1 decks94 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
79%inclusion362 decks461 decks
71%synergy
Ripples of Undeath
73%inclusion335 decks461 decks
70%synergy
Entity Tracker
71%inclusion326 decks461 decks
64%synergy
Starfield Mystic
66%inclusion304 decks461 decks
59%synergy
Animate Dead
67%inclusion309 decks461 decks
57%synergy
Gravebreaker Lamia
58%inclusion267 decks461 decks
57%synergy
Mesa Enchantress
66%inclusion302 decks461 decks
57%synergy
Demon of Fate's Design
59%inclusion273 decks461 decks
54%synergy
Scrabbling Skullcrab
54%inclusion247 decks461 decks
53%synergy
Dress Down
55%inclusion252 decks461 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
56%inclusion256 decks461 decks
50%synergy
Doomwake Giant
55%inclusion252 decks461 decks
49%synergy
Mystic Remora
53%inclusion245 decks461 decks
32%synergy
Sphere of Safety
52%inclusion241 decks461 decks
43%synergy
Necromancy
52%inclusion239 decks461 decks
47%synergy
Overlord of the Floodpits
51%inclusion236 decks461 decks
48%synergy
Swords to Plowshares
50%inclusion232 decks461 decks
-18%synergy
Secret Arcade // Dusty Parlor
49%inclusion228 decks461 decks
45%synergy
Overlord of the Balemurk
48%inclusion223 decks461 decks
46%synergy
Mirrormade
48%inclusion223 decks461 decks
39%synergy
Game Changers
Smothering Tithe
38%inclusion174 decks461 decks
6%synergy
Rhystic Study
29%inclusion133 decks461 decks
-3%synergy
Enlightened Tutor
12%inclusion54 decks461 decks
-8%synergy
Gifts Ungiven
8.9%inclusion41 decks461 decks
7%synergy
Necropotence
7.2%inclusion33 decks461 decks
0%synergy
Cyclonic Rift
6.7%inclusion31 decks461 decks
-17%synergy
Serra's Sanctum
5.9%inclusion27 decks461 decks
4%synergy
Teferi's Protection
5.6%inclusion26 decks461 decks
-11%synergy
Demonic Tutor
5.4%inclusion25 decks461 decks
-16%synergy
Creatures
Ondu Spiritdancer
46%inclusion210 decks461 decks
39%synergy
Victor, Valgavoth's Seneschal
45%inclusion209 decks461 decks
43%synergy
Fear of Impostors
44%inclusion205 decks461 decks
43%synergy
Zur, Eternal Schemer
44%inclusion202 decks461 decks
41%synergy
Silent Hallcreeper
34%inclusion155 decks461 decks
29%synergy
Zur the Enchanter
33%inclusion153 decks461 decks
28%synergy
Ghostly Dancers
31%inclusion143 decks461 decks
28%synergy
Enduring Curiosity
28%inclusion129 decks461 decks
20%synergy
Heliod, the Radiant Dawn
26%inclusion119 decks461 decks
22%synergy
Grim Guardian
24%inclusion110 decks461 decks
21%synergy
Soaring Lightbringer
23%inclusion107 decks461 decks
18%synergy
Moon-Blessed Cleric
23%inclusion107 decks461 decks
19%synergy
Archon of Sun's Grace
22%inclusion100 decks461 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion91 decks461 decks
18%synergy
Sage of Mysteries
18%inclusion81 decks461 decks
17%synergy
Aminatou, Veil Piercer
17%inclusion79 decks461 decks
16%synergy
Overlord of the Mistmoors
17%inclusion78 decks461 decks
15%synergy
Mindwrack Harpy
16%inclusion72 decks461 decks
15%synergy
Alseid of Life's Bounty
14%inclusion64 decks461 decks
12%synergy
Ancient Cellarspawn
13%inclusion61 decks461 decks
10%synergy
Athreos, Shroud-Veiled
13%inclusion61 decks461 decks
9%synergy
Archetype of Imagination
13%inclusion61 decks461 decks
9%synergy
Balemurk Leech
13%inclusion60 decks461 decks
12%synergy
Lotho, Corrupt Shirriff
13%inclusion60 decks461 decks
-4%synergy
Hedron Crab
12%inclusion57 decks461 decks
12%synergy
Hullbreaker Horror
12%inclusion54 decks461 decks
6%synergy
Nashi, Searcher in the Dark
11%inclusion49 decks461 decks
10%synergy
Esper Sentinel
11%inclusion49 decks461 decks
-17%synergy
Ledger Shredder
10%inclusion47 decks461 decks
1%synergy
Sun Titan
10%inclusion47 decks461 decks
2%synergy
Skullsnap Nuisance
10%inclusion46 decks461 decks
10%synergy
Witch Enchanter
10%inclusion45 decks461 decks
3%synergy
Gremlin Tamer
10%inclusion45 decks461 decks
9%synergy
Lurrus of the Dream-Den
9.3%inclusion43 decks461 decks
8%synergy
Spirited Companion
8.5%inclusion39 decks461 decks
7%synergy
Emet-Selch of the Third Seat
7.8%inclusion27 decks344 decks
-2%synergy
Solemn Simulacrum
7.8%inclusion36 decks461 decks
-7%synergy
Valley Floodcaller
6.9%inclusion32 decks461 decks
3%synergy
Stenn, Paranoid Partisan
6.9%inclusion32 decks461 decks
5%synergy
Valgavoth, Terror Eater
6.9%inclusion32 decks461 decks
4%synergy
Summon: Yojimbo
6.7%inclusion23 decks341 decks
6%synergy
Starnheim Courser
6.7%inclusion31 decks461 decks
3%synergy
Nightmare Shepherd
6.7%inclusion31 decks461 decks
4%synergy
Grand Abolisher
6.5%inclusion30 decks461 decks
-8%synergy
Auramancer
6.5%inclusion30 decks461 decks
4%synergy
Fear of Infinity
6.1%inclusion28 decks461 decks
5%synergy
Metamorphosis Fanatic
5.9%inclusion27 decks461 decks
1%synergy
Laboratory Maniac
5.9%inclusion27 decks461 decks
3%synergy
Stitcher's Supplier
5.9%inclusion27 decks461 decks
5%synergy
Summon: Bahamut
5.8%inclusion20 decks344 decks
4%synergy
Instants
Counterspell
34%inclusion158 decks461 decks
-7%synergy
Arcane Denial
32%inclusion146 decks461 decks
11%synergy
An Offer You Can't Refuse
28%inclusion128 decks461 decks
1%synergy
Entomb
27%inclusion123 decks461 decks
20%synergy
Path to Exile
26%inclusion119 decks461 decks
-16%synergy
Dark Ritual
26%inclusion119 decks461 decks
6%synergy
Void Rend
18%inclusion84 decks461 decks
-16%synergy
Inkshield
17%inclusion78 decks461 decks
8%synergy
Dovin's Veto
16%inclusion75 decks461 decks
-9%synergy
Thirst for Meaning
16%inclusion75 decks461 decks
15%synergy
Swan Song
16%inclusion74 decks461 decks
-4%synergy
Frantic Search
16%inclusion73 decks461 decks
-2%synergy
Sink into Stupor
15%inclusion67 decks461 decks
2%synergy
Otherworldly Gaze
13%inclusion59 decks461 decks
11%synergy
Mana Drain
13%inclusion58 decks461 decks
-5%synergy
Negate
12%inclusion57 decks461 decks
-4%synergy
Fell the Profane
12%inclusion56 decks461 decks
3%synergy
Brainstorm
11%inclusion49 decks461 decks
-7%synergy
Anguished Unmaking
9.1%inclusion42 decks461 decks
-16%synergy
Fact or Fiction
6.7%inclusion31 decks461 decks
3%synergy
Waterlogged Teachings
5.9%inclusion27 decks461 decks
1%synergy
Faithful Mending
5.9%inclusion27 decks461 decks
2%synergy
Utter End
5.9%inclusion27 decks461 decks
-1%synergy
Generous Gift
5.9%inclusion27 decks461 decks
-9%synergy
Sorceries
Sevinne's Reclamation
46%inclusion214 decks461 decks
38%synergy
Redress Fate
34%inclusion157 decks461 decks
28%synergy
Windfall
25%inclusion113 decks461 decks
11%synergy
Singularity Rupture
22%inclusion65 decks296 decks
20%synergy
Reanimate
22%inclusion100 decks461 decks
6%synergy
Extinguish All Hope
19%inclusion89 decks461 decks
18%synergy
Dance of the Manse
19%inclusion86 decks461 decks
15%synergy
Toxic Deluge
15%inclusion70 decks461 decks
-4%synergy
Time Wipe
15%inclusion68 decks461 decks
8%synergy
Damn
14%inclusion66 decks461 decks
-6%synergy
Glimpse the Unthinkable
14%inclusion65 decks461 decks
14%synergy
Idyllic Tutor
13%inclusion62 decks461 decks
9%synergy
Resurgent Belief
12%inclusion54 decks461 decks
10%synergy
Supreme Verdict
11%inclusion52 decks461 decks
-4%synergy
Demonic Counsel
10%inclusion48 decks461 decks
9%synergy
Space-Time Anomaly
10%inclusion29 decks291 decks
8%synergy
Replenish
9.1%inclusion42 decks461 decks
7%synergy
Buried Alive
9.1%inclusion42 decks461 decks
5%synergy
Unmarked Grave
7.8%inclusion36 decks461 decks
6%synergy
Farewell
6.7%inclusion31 decks461 decks
-6%synergy
Ponder
6.5%inclusion30 decks461 decks
-3%synergy
Lively Dirge
6.3%inclusion29 decks461 decks
5%synergy
Utility Artifacts
Mesmeric Orb
18%inclusion84 decks461 decks
17%synergy
Cloud Key
13%inclusion62 decks461 decks
10%synergy
Lightning Greaves
8.7%inclusion40 decks461 decks
-14%synergy
Wayfarer's Bauble
7.6%inclusion35 decks461 decks
0%synergy
Swiftfoot Boots
5.4%inclusion25 decks461 decks
-19%synergy
Keys to the House
5.2%inclusion24 decks461 decks
5%synergy
Enchantments
Amphibian Downpour
46%inclusion213 decks461 decks
42%synergy
Propaganda
45%inclusion206 decks461 decks
17%synergy
Grasp of Fate
43%inclusion199 decks461 decks
37%synergy
Seal of Cleansing
42%inclusion194 decks461 decks
41%synergy
Cemetery Tampering
40%inclusion184 decks461 decks
39%synergy
Sigil of the Empty Throne
40%inclusion184 decks461 decks
34%synergy
Ghostly Prison
37%inclusion172 decks461 decks
15%synergy
Estrid's Invocation
35%inclusion162 decks461 decks
31%synergy
Blind Obedience
34%inclusion158 decks461 decks
22%synergy
Starfield of Nyx
33%inclusion151 decks461 decks
29%synergy
Cacophony Unleashed
31%inclusion145 decks461 decks
30%synergy
Dance of the Dead
28%inclusion131 decks461 decks
26%synergy
Monologue Tax
28%inclusion131 decks461 decks
22%synergy
The Tale of Tamiyo
26%inclusion122 decks461 decks
26%synergy
Stillness in Motion
24%inclusion97 decks397 decks
24%synergy
Seal of Removal
24%inclusion110 decks461 decks
23%synergy
Darksteel Mutation
24%inclusion109 decks461 decks
17%synergy
The Meathook Massacre
23%inclusion108 decks461 decks
20%synergy
Phyrexian Arena
23%inclusion105 decks461 decks
9%synergy
Sheltered by Ghosts
22%inclusion103 decks461 decks
20%synergy
Defiled Crypt // Cadaver Lab
22%inclusion101 decks461 decks
21%synergy
Timely Ward
22%inclusion101 decks461 decks
17%synergy
Imprisoned in the Moon
21%inclusion97 decks461 decks
14%synergy
Black Market Connections
21%inclusion96 decks461 decks
7%synergy
Extravagant Replication
21%inclusion96 decks461 decks
16%synergy
Out of the Tombs
21%inclusion95 decks461 decks
20%synergy
Polluted Cistern // Dim Oubliette
20%inclusion94 decks461 decks
20%synergy
Shark Typhoon
20%inclusion94 decks461 decks
15%synergy
Greater Auramancy
20%inclusion94 decks461 decks
16%synergy
All That Glitters
20%inclusion94 decks461 decks
12%synergy
Ethereal Armor
20%inclusion92 decks461 decks
15%synergy
Copy Enchantment
18%inclusion85 decks461 decks
14%synergy
Touch the Spirit Realm
17%inclusion79 decks461 decks
15%synergy
Authority of the Consuls
17%inclusion79 decks461 decks
5%synergy
Leyline of Anticipation
17%inclusion79 decks461 decks
13%synergy
Mirror Room // Fractured Realm
17%inclusion78 decks461 decks
15%synergy
Restricted Office // Lecture Hall
17%inclusion77 decks461 decks
15%synergy
Bottomless Pool // Locker Room
16%inclusion73 decks461 decks
14%synergy
The Eldest Reborn
16%inclusion73 decks461 decks
13%synergy
Hallowed Haunting
16%inclusion72 decks461 decks
13%synergy
Court of Cunning
15%inclusion68 decks461 decks
14%synergy
Central Elevator // Promising Stairs
15%inclusion68 decks461 decks
14%synergy
Static Prison
15%inclusion68 decks461 decks
14%synergy
Secrets of the Dead
15%inclusion68 decks461 decks
14%synergy
Teval's Judgment
14%inclusion58 decks403 decks
14%synergy
Nowhere to Run
14%inclusion63 decks461 decks
12%synergy
Land Tax
14%inclusion63 decks461 decks
8%synergy
One with the Multiverse
13%inclusion61 decks461 decks
9%synergy
Cramped Vents // Access Maze
13%inclusion60 decks461 decks
11%synergy
Aura of Silence
13%inclusion59 decks461 decks
10%synergy
Battles
Invasion of Theros
7.8%inclusion36 decks461 decks
6%synergy
Utility Lands
Hall of Heliod's Generosity
64%inclusion294 decks461 decks
51%synergy
Bojuka Bog
43%inclusion199 decks461 decks
16%synergy
Cephalid Coliseum
19%inclusion89 decks461 decks
16%synergy
Otawara, Soaring City
17%inclusion80 decks461 decks
-2%synergy
Takenuma, Abandoned Mire
16%inclusion72 decks461 decks
9%synergy
Reliquary Tower
12%inclusion57 decks461 decks
-21%synergy
Halimar Depths
10%inclusion46 decks461 decks
5%synergy
Urborg, Tomb of Yawgmoth
7.8%inclusion36 decks461 decks
-5%synergy
Urza's Saga
5.6%inclusion26 decks461 decks
-6%synergy
Rogue's Passage
5.2%inclusion24 decks461 decks
-4%synergy
Adagia, Windswept Bastion
5.1%inclusion15 decks296 decks
3%synergy
Mana Artifacts
Sol Ring
88%inclusion405 decks461 decks
-2%synergy
Arcane Signet
87%inclusion403 decks461 decks
0%synergy
Talisman of Progress
51%inclusion233 decks461 decks
7%synergy
Talisman of Dominance
50%inclusion229 decks461 decks
0%synergy
Talisman of Hierarchy
45%inclusion209 decks461 decks
2%synergy
Azorius Signet
39%inclusion180 decks461 decks
7%synergy
Orzhov Signet
37%inclusion172 decks461 decks
4%synergy
Fellwar Stone
33%inclusion150 decks461 decks
-1%synergy
Dimir Signet
27%inclusion126 decks461 decks
-4%synergy
Mind Stone
15%inclusion68 decks461 decks
2%synergy
Commander's Sphere
12%inclusion56 decks461 decks
-7%synergy
Chromatic Lantern
6.5%inclusion30 decks461 decks
-7%synergy
Lands
Island
97%inclusion445 decks461 decks
4%synergy
Swamp
96%inclusion444 decks461 decks
5%synergy
Command Tower
96%inclusion443 decks461 decks
4%synergy
Plains
96%inclusion443 decks461 decks
5%synergy
Caves of Koilos
62%inclusion284 decks461 decks
26%synergy
Arcane Sanctum
61%inclusion282 decks461 decks
7%synergy
Adarkar Wastes
57%inclusion265 decks461 decks
26%synergy
Underground River
53%inclusion244 decks461 decks
20%synergy
Watery Grave
53%inclusion243 decks461 decks
2%synergy
Godless Shrine
52%inclusion239 decks461 decks
1%synergy
Exotic Orchard
52%inclusion239 decks461 decks
-7%synergy
Hallowed Fountain
51%inclusion233 decks461 decks
1%synergy
Flooded Strand
44%inclusion204 decks461 decks
6%synergy
Polluted Delta
44%inclusion201 decks461 decks
6%synergy
Raffine's Tower
43%inclusion198 decks461 decks
2%synergy
Glacial Fortress
41%inclusion187 decks461 decks
0%synergy
Isolated Chapel
40%inclusion184 decks461 decks
0%synergy
Marsh Flats
38%inclusion173 decks461 decks
1%synergy
Prairie Stream
34%inclusion157 decks461 decks
-7%synergy
Drowned Catacomb
34%inclusion157 decks461 decks
-2%synergy
Valgavoth's Lair
34%inclusion155 decks461 decks
31%synergy
Meticulous Archive
33%inclusion153 decks461 decks
19%synergy
Sunken Hollow
33%inclusion150 decks461 decks
-7%synergy
Sea of Clouds
32%inclusion147 decks461 decks
-4%synergy
Undercity Sewers
31%inclusion144 decks461 decks
17%synergy
Vault of Champions
31%inclusion143 decks461 decks
-2%synergy
Shadowy Backstreet
31%inclusion141 decks461 decks
18%synergy
Morphic Pool
28%inclusion127 decks461 decks
-7%synergy
Azorius Chancery
27%inclusion123 decks461 decks
13%synergy
Floodfarm Verge
27%inclusion123 decks461 decks
16%synergy
Terramorphic Expanse
25%inclusion117 decks461 decks
9%synergy
Evolving Wilds
25%inclusion117 decks461 decks
0%synergy
Temple of Silence
25%inclusion117 decks461 decks
6%synergy
Temple of Enlightenment
24%inclusion111 decks461 decks
8%synergy
Obscura Storefront
24%inclusion111 decks461 decks
14%synergy
Deserted Beach
24%inclusion110 decks461 decks
3%synergy
Orzhov Basilica
23%inclusion108 decks461 decks
8%synergy
Gloomlake Verge
23%inclusion105 decks461 decks
12%synergy
Temple of Deceit
23%inclusion104 decks461 decks
5%synergy
Contaminated Landscape
22%inclusion103 decks461 decks
8%synergy
Dimir Aqueduct
22%inclusion103 decks461 decks
9%synergy
Tainted Field
22%inclusion103 decks461 decks
15%synergy
Shipwreck Marsh
21%inclusion95 decks461 decks
0%synergy
Tainted Isle
20%inclusion94 decks461 decks
14%synergy
Ash Barrens
17%inclusion80 decks461 decks
7%synergy
Path of Ancestry
16%inclusion74 decks461 decks
-11%synergy
Shattered Sanctum
16%inclusion74 decks461 decks
0%synergy
Sink into Stupor
15%inclusion67 decks461 decks
2%synergy
Darkwater Catacombs
13%inclusion62 decks461 decks
-1%synergy
Fetid Heath
13%inclusion60 decks461 decks
1%synergy
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