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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Commander Spellbook
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Creatures
Instants
Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
4.9%inclusion7 decks144 decks
4%synergy
Twilight Diviner
4.2%inclusion6 decks144 decks
3%synergy
Mornsong Aria
3.3%inclusion5 decks151 decks
3%synergy
Grave Venerations
2.0%inclusion3 decks150 decks
2%synergy
Paramecia Coloniex
1.6%inclusion1 decks63 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
78%inclusion385 decks491 decks
71%synergy
Ripples of Undeath
73%inclusion357 decks491 decks
70%synergy
Entity Tracker
70%inclusion343 decks491 decks
64%synergy
Starfield Mystic
66%inclusion323 decks491 decks
59%synergy
Animate Dead
67%inclusion331 decks491 decks
58%synergy
Gravebreaker Lamia
58%inclusion286 decks491 decks
57%synergy
Mesa Enchantress
66%inclusion325 decks491 decks
57%synergy
Demon of Fate's Design
60%inclusion296 decks491 decks
55%synergy
Hall of Heliod's Generosity
65%inclusion321 decks491 decks
52%synergy
Scrabbling Skullcrab
53%inclusion260 decks491 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
55%inclusion272 decks491 decks
50%synergy
Doomwake Giant
55%inclusion271 decks491 decks
49%synergy
Dress Down
54%inclusion264 decks491 decks
51%synergy
Mystic Remora
54%inclusion263 decks491 decks
33%synergy
Necromancy
52%inclusion257 decks491 decks
48%synergy
Sphere of Safety
52%inclusion257 decks491 decks
43%synergy
Overlord of the Floodpits
52%inclusion253 decks491 decks
48%synergy
Swords to Plowshares
51%inclusion251 decks491 decks
-17%synergy
Secret Arcade // Dusty Parlor
49%inclusion242 decks491 decks
45%synergy
Mirrormade
49%inclusion240 decks491 decks
39%synergy
Game Changers
Smothering Tithe
37%inclusion183 decks491 decks
6%synergy
Rhystic Study
29%inclusion140 decks491 decks
-3%synergy
Enlightened Tutor
12%inclusion57 decks491 decks
-8%synergy
Gifts Ungiven
9.0%inclusion44 decks491 decks
7%synergy
Necropotence
6.7%inclusion33 decks491 decks
0%synergy
Serra's Sanctum
6.5%inclusion32 decks491 decks
5%synergy
Demonic Tutor
5.9%inclusion29 decks491 decks
-15%synergy
Farewell
5.9%inclusion29 decks491 decks
-7%synergy
Cyclonic Rift
5.9%inclusion29 decks491 decks
-18%synergy
Teferi's Protection
5.5%inclusion27 decks491 decks
-11%synergy
Creatures
Overlord of the Balemurk
48%inclusion234 decks491 decks
46%synergy
Ondu Spiritdancer
46%inclusion227 decks491 decks
40%synergy
Zur, Eternal Schemer
44%inclusion217 decks491 decks
41%synergy
Victor, Valgavoth's Seneschal
44%inclusion215 decks491 decks
42%synergy
Fear of Impostors
44%inclusion214 decks491 decks
42%synergy
Silent Hallcreeper
34%inclusion166 decks491 decks
29%synergy
Zur the Enchanter
33%inclusion164 decks491 decks
28%synergy
Ghostly Dancers
31%inclusion153 decks491 decks
29%synergy
Enduring Curiosity
27%inclusion132 decks491 decks
19%synergy
Heliod, the Radiant Dawn
26%inclusion126 decks491 decks
22%synergy
Soaring Lightbringer
24%inclusion117 decks491 decks
19%synergy
Moon-Blessed Cleric
24%inclusion117 decks491 decks
19%synergy
Grim Guardian
23%inclusion115 decks491 decks
21%synergy
Archon of Sun's Grace
22%inclusion108 decks491 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion99 decks491 decks
18%synergy
Sage of Mysteries
18%inclusion89 decks491 decks
18%synergy
Aminatou, Veil Piercer
18%inclusion87 decks491 decks
16%synergy
Overlord of the Mistmoors
16%inclusion81 decks491 decks
14%synergy
Mindwrack Harpy
15%inclusion76 decks491 decks
15%synergy
Alseid of Life's Bounty
13%inclusion65 decks491 decks
12%synergy
Athreos, Shroud-Veiled
13%inclusion64 decks491 decks
9%synergy
Archetype of Imagination
13%inclusion64 decks491 decks
8%synergy
Balemurk Leech
13%inclusion63 decks491 decks
12%synergy
Lotho, Corrupt Shirriff
13%inclusion62 decks491 decks
-4%synergy
Ancient Cellarspawn
13%inclusion62 decks491 decks
10%synergy
Hedron Crab
12%inclusion60 decks491 decks
12%synergy
Hullbreaker Horror
12%inclusion58 decks491 decks
6%synergy
Esper Sentinel
11%inclusion54 decks491 decks
-16%synergy
Ledger Shredder
11%inclusion53 decks491 decks
2%synergy
Witch Enchanter
10%inclusion50 decks491 decks
3%synergy
Nashi, Searcher in the Dark
10%inclusion50 decks491 decks
10%synergy
Sun Titan
10%inclusion48 decks491 decks
1%synergy
Skullsnap Nuisance
9.4%inclusion46 decks491 decks
9%synergy
Gremlin Tamer
9.2%inclusion45 decks491 decks
8%synergy
Lurrus of the Dream-Den
9.0%inclusion44 decks491 decks
7%synergy
Spirited Companion
8.4%inclusion41 decks491 decks
6%synergy
Solemn Simulacrum
7.3%inclusion36 decks491 decks
-7%synergy
Summon: Yojimbo
7.0%inclusion26 decks373 decks
6%synergy
Auramancer
6.9%inclusion34 decks491 decks
4%synergy
Valgavoth, Terror Eater
6.9%inclusion34 decks491 decks
4%synergy
Emet-Selch of the Third Seat
6.9%inclusion26 decks376 decks
-3%synergy
Stenn, Paranoid Partisan
6.7%inclusion33 decks491 decks
5%synergy
Valley Floodcaller
6.7%inclusion33 decks491 decks
3%synergy
Nightmare Shepherd
6.5%inclusion32 decks491 decks
4%synergy
Grand Abolisher
6.5%inclusion32 decks491 decks
-8%synergy
Laboratory Maniac
6.3%inclusion31 decks491 decks
3%synergy
Summon: Bahamut
6.1%inclusion23 decks376 decks
5%synergy
Starnheim Courser
6.1%inclusion30 decks491 decks
2%synergy
Stitcher's Supplier
5.9%inclusion29 decks491 decks
5%synergy
Metamorphosis Fanatic
5.7%inclusion28 decks491 decks
1%synergy
Instants
Counterspell
35%inclusion173 decks491 decks
-6%synergy
Arcane Denial
32%inclusion158 decks491 decks
12%synergy
An Offer You Can't Refuse
29%inclusion141 decks491 decks
2%synergy
Entomb
28%inclusion136 decks491 decks
21%synergy
Path to Exile
26%inclusion126 decks491 decks
-17%synergy
Dark Ritual
25%inclusion123 decks491 decks
5%synergy
Void Rend
19%inclusion92 decks491 decks
-16%synergy
Inkshield
17%inclusion84 decks491 decks
8%synergy
Dovin's Veto
16%inclusion80 decks491 decks
-9%synergy
Thirst for Meaning
16%inclusion79 decks491 decks
15%synergy
Frantic Search
16%inclusion78 decks491 decks
-2%synergy
Swan Song
16%inclusion77 decks491 decks
-4%synergy
Sink into Stupor
14%inclusion69 decks491 decks
1%synergy
Negate
13%inclusion64 decks491 decks
-3%synergy
Otherworldly Gaze
13%inclusion62 decks491 decks
10%synergy
Mana Drain
12%inclusion58 decks491 decks
-6%synergy
Fell the Profane
11%inclusion56 decks491 decks
3%synergy
Brainstorm
11%inclusion54 decks491 decks
-6%synergy
Anguished Unmaking
8.8%inclusion43 decks491 decks
-17%synergy
Fact or Fiction
6.5%inclusion32 decks491 decks
3%synergy
Utter End
6.1%inclusion30 decks491 decks
0%synergy
Faithful Mending
5.7%inclusion28 decks491 decks
2%synergy
Waterlogged Teachings
5.7%inclusion28 decks491 decks
1%synergy
Return to Dust
5.3%inclusion26 decks491 decks
2%synergy
Generous Gift
5.3%inclusion26 decks491 decks
-9%synergy
Cabal Ritual
5.1%inclusion25 decks491 decks
2%synergy
Sorceries
Sevinne's Reclamation
46%inclusion227 decks491 decks
37%synergy
Redress Fate
35%inclusion170 decks491 decks
29%synergy
Windfall
25%inclusion121 decks491 decks
11%synergy
Singularity Rupture
22%inclusion73 decks328 decks
20%synergy
Reanimate
22%inclusion109 decks491 decks
6%synergy
Extinguish All Hope
19%inclusion94 decks491 decks
18%synergy
Dance of the Manse
17%inclusion84 decks491 decks
14%synergy
Time Wipe
15%inclusion74 decks491 decks
8%synergy
Damn
14%inclusion71 decks491 decks
-6%synergy
Glimpse the Unthinkable
14%inclusion70 decks491 decks
14%synergy
Idyllic Tutor
14%inclusion67 decks491 decks
9%synergy
Toxic Deluge
14%inclusion67 decks491 decks
-6%synergy
Supreme Verdict
11%inclusion56 decks491 decks
-3%synergy
Resurgent Belief
11%inclusion56 decks491 decks
9%synergy
Space-Time Anomaly
10%inclusion33 decks323 decks
9%synergy
Demonic Counsel
10%inclusion49 decks491 decks
9%synergy
Replenish
9.0%inclusion44 decks491 decks
7%synergy
Buried Alive
9.0%inclusion44 decks491 decks
5%synergy
Unmarked Grave
7.9%inclusion39 decks491 decks
7%synergy
Ponder
7.5%inclusion37 decks491 decks
-2%synergy
Lively Dirge
6.7%inclusion33 decks491 decks
5%synergy
Austere Command
5.9%inclusion29 decks491 decks
-3%synergy
Open the Vaults
5.1%inclusion25 decks491 decks
4%synergy
Utility Artifacts
Mesmeric Orb
19%inclusion92 decks491 decks
18%synergy
Cloud Key
13%inclusion65 decks491 decks
10%synergy
Lightning Greaves
8.6%inclusion42 decks491 decks
-14%synergy
Wayfarer's Bauble
7.3%inclusion36 decks491 decks
0%synergy
Swiftfoot Boots
5.9%inclusion29 decks491 decks
-18%synergy
Keys to the House
5.1%inclusion25 decks491 decks
5%synergy
Enchantments
Amphibian Downpour
47%inclusion232 decks491 decks
43%synergy
Propaganda
44%inclusion214 decks491 decks
16%synergy
Grasp of Fate
43%inclusion212 decks491 decks
37%synergy
Seal of Cleansing
42%inclusion207 decks491 decks
41%synergy
Sigil of the Empty Throne
41%inclusion199 decks491 decks
35%synergy
Cemetery Tampering
39%inclusion192 decks491 decks
38%synergy
Ghostly Prison
37%inclusion182 decks491 decks
15%synergy
Estrid's Invocation
36%inclusion177 decks491 decks
31%synergy
Blind Obedience
34%inclusion166 decks491 decks
22%synergy
Starfield of Nyx
33%inclusion164 decks491 decks
29%synergy
Cacophony Unleashed
32%inclusion157 decks491 decks
30%synergy
Monologue Tax
31%inclusion154 decks491 decks
25%synergy
Dance of the Dead
29%inclusion143 decks491 decks
27%synergy
The Tale of Tamiyo
27%inclusion131 decks491 decks
26%synergy
Stillness in Motion
24%inclusion104 decks429 decks
24%synergy
Darksteel Mutation
24%inclusion119 decks491 decks
18%synergy
Seal of Removal
24%inclusion116 decks491 decks
23%synergy
The Meathook Massacre
23%inclusion115 decks491 decks
20%synergy
Phyrexian Arena
23%inclusion112 decks491 decks
9%synergy
Imprisoned in the Moon
22%inclusion110 decks491 decks
16%synergy
Timely Ward
22%inclusion107 decks491 decks
17%synergy
Sheltered by Ghosts
21%inclusion105 decks491 decks
19%synergy
Extravagant Replication
21%inclusion103 decks491 decks
16%synergy
Shark Typhoon
21%inclusion102 decks491 decks
15%synergy
Defiled Crypt // Cadaver Lab
21%inclusion102 decks491 decks
20%synergy
Greater Auramancy
20%inclusion100 decks491 decks
16%synergy
Ethereal Armor
20%inclusion99 decks491 decks
15%synergy
Black Market Connections
20%inclusion97 decks491 decks
5%synergy
Out of the Tombs
20%inclusion96 decks491 decks
19%synergy
All That Glitters
20%inclusion96 decks491 decks
11%synergy
Polluted Cistern // Dim Oubliette
20%inclusion96 decks491 decks
19%synergy
Copy Enchantment
19%inclusion91 decks491 decks
14%synergy
Touch the Spirit Realm
18%inclusion86 decks491 decks
15%synergy
Hallowed Haunting
17%inclusion84 decks491 decks
15%synergy
Authority of the Consuls
17%inclusion82 decks491 decks
4%synergy
Leyline of Anticipation
16%inclusion81 decks491 decks
12%synergy
Restricted Office // Lecture Hall
16%inclusion81 decks491 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion80 decks491 decks
14%synergy
The Eldest Reborn
16%inclusion79 decks491 decks
14%synergy
Bottomless Pool // Locker Room
15%inclusion76 decks491 decks
14%synergy
Static Prison
15%inclusion73 decks491 decks
14%synergy
Secrets of the Dead
14%inclusion70 decks491 decks
14%synergy
Teval's Judgment
14%inclusion62 decks435 decks
13%synergy
Court of Cunning
14%inclusion69 decks491 decks
13%synergy
Land Tax
14%inclusion68 decks491 decks
8%synergy
Central Elevator // Promising Stairs
14%inclusion67 decks491 decks
13%synergy
One with the Multiverse
13%inclusion66 decks491 decks
9%synergy
Nowhere to Run
13%inclusion66 decks491 decks
12%synergy
Oubliette
13%inclusion65 decks491 decks
12%synergy
Cramped Vents // Access Maze
13%inclusion62 decks491 decks
10%synergy
Battles
Invasion of Theros
7.3%inclusion36 decks491 decks
6%synergy
Utility Lands
Bojuka Bog
43%inclusion213 decks491 decks
16%synergy
Cephalid Coliseum
19%inclusion92 decks491 decks
15%synergy
Otawara, Soaring City
17%inclusion85 decks491 decks
-2%synergy
Takenuma, Abandoned Mire
15%inclusion76 decks491 decks
9%synergy
Reliquary Tower
12%inclusion61 decks491 decks
-21%synergy
Halimar Depths
11%inclusion53 decks491 decks
6%synergy
Urborg, Tomb of Yawgmoth
7.1%inclusion35 decks491 decks
-6%synergy
Urza's Saga
5.7%inclusion28 decks491 decks
-6%synergy
Adagia, Windswept Bastion
5.5%inclusion18 decks328 decks
3%synergy
Rogue's Passage
5.1%inclusion25 decks491 decks
-5%synergy
Mana Artifacts
Sol Ring
89%inclusion435 decks491 decks
-1%synergy
Arcane Signet
88%inclusion432 decks491 decks
0%synergy
Talisman of Progress
51%inclusion250 decks491 decks
7%synergy
Talisman of Dominance
50%inclusion246 decks491 decks
0%synergy
Talisman of Hierarchy
46%inclusion224 decks491 decks
2%synergy
Azorius Signet
40%inclusion198 decks491 decks
9%synergy
Orzhov Signet
38%inclusion187 decks491 decks
5%synergy
Fellwar Stone
33%inclusion162 decks491 decks
0%synergy
Dimir Signet
28%inclusion138 decks491 decks
-3%synergy
Mind Stone
15%inclusion73 decks491 decks
2%synergy
Commander's Sphere
12%inclusion60 decks491 decks
-6%synergy
Chromatic Lantern
6.3%inclusion31 decks491 decks
-7%synergy
Lands
Island
97%inclusion476 decks491 decks
4%synergy
Swamp
97%inclusion475 decks491 decks
5%synergy
Command Tower
96%inclusion473 decks491 decks
4%synergy
Plains
96%inclusion473 decks491 decks
5%synergy
Caves of Koilos
62%inclusion304 decks491 decks
26%synergy
Arcane Sanctum
62%inclusion304 decks491 decks
8%synergy
Adarkar Wastes
58%inclusion287 decks491 decks
27%synergy
Watery Grave
54%inclusion264 decks491 decks
3%synergy
Godless Shrine
53%inclusion262 decks491 decks
2%synergy
Exotic Orchard
53%inclusion261 decks491 decks
-5%synergy
Underground River
53%inclusion260 decks491 decks
19%synergy
Hallowed Fountain
51%inclusion251 decks491 decks
1%synergy
Polluted Delta
44%inclusion215 decks491 decks
6%synergy
Flooded Strand
44%inclusion215 decks491 decks
6%synergy
Raffine's Tower
43%inclusion211 decks491 decks
2%synergy
Glacial Fortress
40%inclusion197 decks491 decks
-1%synergy
Isolated Chapel
40%inclusion194 decks491 decks
-1%synergy
Marsh Flats
37%inclusion184 decks491 decks
1%synergy
Prairie Stream
35%inclusion171 decks491 decks
-6%synergy
Drowned Catacomb
35%inclusion171 decks491 decks
-2%synergy
Valgavoth's Lair
34%inclusion166 decks491 decks
31%synergy
Sunken Hollow
34%inclusion165 decks491 decks
-6%synergy
Meticulous Archive
33%inclusion162 decks491 decks
19%synergy
Sea of Clouds
33%inclusion161 decks491 decks
-3%synergy
Undercity Sewers
32%inclusion155 decks491 decks
17%synergy
Vault of Champions
31%inclusion152 decks491 decks
-2%synergy
Shadowy Backstreet
31%inclusion151 decks491 decks
18%synergy
Morphic Pool
29%inclusion140 decks491 decks
-5%synergy
Floodfarm Verge
28%inclusion138 decks491 decks
17%synergy
Azorius Chancery
27%inclusion134 decks491 decks
13%synergy
Terramorphic Expanse
27%inclusion131 decks491 decks
11%synergy
Evolving Wilds
26%inclusion128 decks491 decks
1%synergy
Temple of Silence
25%inclusion123 decks491 decks
6%synergy
Temple of Enlightenment
24%inclusion119 decks491 decks
8%synergy
Obscura Storefront
24%inclusion118 decks491 decks
14%synergy
Orzhov Basilica
24%inclusion118 decks491 decks
9%synergy
Tainted Field
24%inclusion116 decks491 decks
17%synergy
Deserted Beach
24%inclusion116 decks491 decks
3%synergy
Dimir Aqueduct
23%inclusion113 decks491 decks
10%synergy
Gloomlake Verge
23%inclusion113 decks491 decks
12%synergy
Temple of Deceit
22%inclusion110 decks491 decks
5%synergy
Shipwreck Marsh
22%inclusion106 decks491 decks
1%synergy
Contaminated Landscape
22%inclusion106 decks491 decks
8%synergy
Tainted Isle
21%inclusion103 decks491 decks
15%synergy
Ash Barrens
18%inclusion86 decks491 decks
7%synergy
Shattered Sanctum
16%inclusion79 decks491 decks
0%synergy
Path of Ancestry
15%inclusion76 decks491 decks
-12%synergy
Sink into Stupor
14%inclusion69 decks491 decks
1%synergy
Darkwater Catacombs
13%inclusion66 decks491 decks
-1%synergy
Skycloud Expanse
13%inclusion64 decks491 decks
-2%synergy
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