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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Instants
Sorceries
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
5.7%inclusion7 decks123 decks
5%synergy
Twilight Diviner
4.9%inclusion6 decks123 decks
3%synergy
Hidden Hideout
2.8%inclusion1 decks36 decks
2%synergy
Grave Venerations
2.3%inclusion3 decks129 decks
2%synergy
Mornsong Aria
2.3%inclusion3 decks130 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
79%inclusion375 decks476 decks
71%synergy
Ripples of Undeath
73%inclusion346 decks476 decks
70%synergy
Entity Tracker
70%inclusion332 decks476 decks
63%synergy
Starfield Mystic
66%inclusion315 decks476 decks
60%synergy
Animate Dead
68%inclusion322 decks476 decks
58%synergy
Gravebreaker Lamia
58%inclusion278 decks476 decks
57%synergy
Mesa Enchantress
66%inclusion315 decks476 decks
57%synergy
Demon of Fate's Design
60%inclusion286 decks476 decks
55%synergy
Scrabbling Skullcrab
54%inclusion257 decks476 decks
53%synergy
Dress Down
55%inclusion261 decks476 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
56%inclusion266 decks476 decks
51%synergy
Doomwake Giant
55%inclusion263 decks476 decks
49%synergy
Mystic Remora
54%inclusion255 decks476 decks
33%synergy
Necromancy
53%inclusion250 decks476 decks
48%synergy
Sphere of Safety
52%inclusion249 decks476 decks
43%synergy
Overlord of the Floodpits
51%inclusion245 decks476 decks
48%synergy
Swords to Plowshares
51%inclusion243 decks476 decks
-17%synergy
Mirrormade
49%inclusion233 decks476 decks
39%synergy
Secret Arcade // Dusty Parlor
49%inclusion233 decks476 decks
44%synergy
Overlord of the Balemurk
48%inclusion229 decks476 decks
46%synergy
Game Changers
Smothering Tithe
38%inclusion179 decks476 decks
6%synergy
Rhystic Study
28%inclusion135 decks476 decks
-3%synergy
Enlightened Tutor
12%inclusion56 decks476 decks
-8%synergy
Gifts Ungiven
8.8%inclusion42 decks476 decks
6%synergy
Necropotence
7.1%inclusion34 decks476 decks
0%synergy
Serra's Sanctum
6.3%inclusion30 decks476 decks
5%synergy
Farewell
6.1%inclusion29 decks476 decks
-7%synergy
Cyclonic Rift
6.1%inclusion29 decks476 decks
-18%synergy
Teferi's Protection
5.5%inclusion26 decks476 decks
-11%synergy
Demonic Tutor
5.5%inclusion26 decks476 decks
-15%synergy
Creatures
Ondu Spiritdancer
46%inclusion217 decks476 decks
39%synergy
Victor, Valgavoth's Seneschal
45%inclusion213 decks476 decks
43%synergy
Zur, Eternal Schemer
44%inclusion211 decks476 decks
41%synergy
Fear of Impostors
44%inclusion210 decks476 decks
43%synergy
Silent Hallcreeper
34%inclusion161 decks476 decks
29%synergy
Zur the Enchanter
33%inclusion159 decks476 decks
28%synergy
Ghostly Dancers
31%inclusion147 decks476 decks
28%synergy
Enduring Curiosity
27%inclusion128 decks476 decks
19%synergy
Heliod, the Radiant Dawn
26%inclusion122 decks476 decks
22%synergy
Grim Guardian
24%inclusion113 decks476 decks
21%synergy
Soaring Lightbringer
24%inclusion113 decks476 decks
19%synergy
Moon-Blessed Cleric
23%inclusion110 decks476 decks
18%synergy
Archon of Sun's Grace
22%inclusion105 decks476 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion96 decks476 decks
18%synergy
Sage of Mysteries
17%inclusion82 decks476 decks
17%synergy
Aminatou, Veil Piercer
17%inclusion79 decks476 decks
15%synergy
Overlord of the Mistmoors
16%inclusion78 decks476 decks
14%synergy
Mindwrack Harpy
16%inclusion74 decks476 decks
15%synergy
Alseid of Life's Bounty
14%inclusion65 decks476 decks
12%synergy
Archetype of Imagination
13%inclusion64 decks476 decks
9%synergy
Athreos, Shroud-Veiled
13%inclusion62 decks476 decks
9%synergy
Lotho, Corrupt Shirriff
13%inclusion60 decks476 decks
-4%synergy
Ancient Cellarspawn
13%inclusion60 decks476 decks
10%synergy
Balemurk Leech
12%inclusion59 decks476 decks
12%synergy
Hedron Crab
12%inclusion58 decks476 decks
12%synergy
Hullbreaker Horror
12%inclusion58 decks476 decks
6%synergy
Esper Sentinel
11%inclusion51 decks476 decks
-17%synergy
Witch Enchanter
10%inclusion49 decks476 decks
3%synergy
Ledger Shredder
10%inclusion49 decks476 decks
1%synergy
Nashi, Searcher in the Dark
10%inclusion48 decks476 decks
10%synergy
Sun Titan
10%inclusion48 decks476 decks
2%synergy
Gremlin Tamer
9.5%inclusion45 decks476 decks
8%synergy
Lurrus of the Dream-Den
9.2%inclusion44 decks476 decks
8%synergy
Skullsnap Nuisance
9.2%inclusion44 decks476 decks
9%synergy
Spirited Companion
8.8%inclusion42 decks476 decks
7%synergy
Solemn Simulacrum
7.8%inclusion37 decks476 decks
-7%synergy
Emet-Selch of the Third Seat
7.5%inclusion27 decks361 decks
-2%synergy
Auramancer
7.1%inclusion34 decks476 decks
4%synergy
Valgavoth, Terror Eater
6.9%inclusion33 decks476 decks
4%synergy
Stenn, Paranoid Partisan
6.7%inclusion32 decks476 decks
5%synergy
Nightmare Shepherd
6.7%inclusion32 decks476 decks
4%synergy
Summon: Yojimbo
6.7%inclusion24 decks358 decks
6%synergy
Starnheim Courser
6.5%inclusion31 decks476 decks
3%synergy
Valley Floodcaller
6.5%inclusion31 decks476 decks
2%synergy
Grand Abolisher
6.3%inclusion30 decks476 decks
-8%synergy
Metamorphosis Fanatic
6.1%inclusion29 decks476 decks
2%synergy
Laboratory Maniac
6.1%inclusion29 decks476 decks
3%synergy
Fear of Infinity
5.9%inclusion28 decks476 decks
5%synergy
Summon: Bahamut
5.8%inclusion21 decks361 decks
4%synergy
Stitcher's Supplier
5.7%inclusion27 decks476 decks
5%synergy
Instants
Counterspell
35%inclusion167 decks476 decks
-6%synergy
Arcane Denial
32%inclusion152 decks476 decks
12%synergy
An Offer You Can't Refuse
29%inclusion136 decks476 decks
1%synergy
Entomb
28%inclusion133 decks476 decks
21%synergy
Path to Exile
26%inclusion126 decks476 decks
-16%synergy
Dark Ritual
25%inclusion118 decks476 decks
5%synergy
Void Rend
19%inclusion89 decks476 decks
-16%synergy
Inkshield
17%inclusion81 decks476 decks
8%synergy
Thirst for Meaning
16%inclusion78 decks476 decks
15%synergy
Dovin's Veto
16%inclusion77 decks476 decks
-9%synergy
Frantic Search
16%inclusion76 decks476 decks
-2%synergy
Swan Song
16%inclusion75 decks476 decks
-4%synergy
Sink into Stupor
14%inclusion69 decks476 decks
2%synergy
Negate
13%inclusion61 decks476 decks
-4%synergy
Otherworldly Gaze
13%inclusion60 decks476 decks
10%synergy
Fell the Profane
12%inclusion56 decks476 decks
3%synergy
Mana Drain
12%inclusion56 decks476 decks
-6%synergy
Brainstorm
11%inclusion51 decks476 decks
-6%synergy
Anguished Unmaking
9.0%inclusion43 decks476 decks
-16%synergy
Fact or Fiction
6.5%inclusion31 decks476 decks
3%synergy
Utter End
6.3%inclusion30 decks476 decks
0%synergy
Faithful Mending
5.7%inclusion27 decks476 decks
2%synergy
Waterlogged Teachings
5.7%inclusion27 decks476 decks
1%synergy
Generous Gift
5.5%inclusion26 decks476 decks
-9%synergy
Return to Dust
5.0%inclusion24 decks476 decks
1%synergy
Sorceries
Sevinne's Reclamation
47%inclusion222 decks476 decks
38%synergy
Redress Fate
34%inclusion164 decks476 decks
29%synergy
Windfall
25%inclusion120 decks476 decks
12%synergy
Singularity Rupture
23%inclusion71 decks313 decks
20%synergy
Reanimate
22%inclusion106 decks476 decks
6%synergy
Extinguish All Hope
19%inclusion92 decks476 decks
18%synergy
Dance of the Manse
18%inclusion85 decks476 decks
14%synergy
Time Wipe
15%inclusion72 decks476 decks
8%synergy
Glimpse the Unthinkable
15%inclusion70 decks476 decks
14%synergy
Toxic Deluge
14%inclusion69 decks476 decks
-5%synergy
Damn
14%inclusion67 decks476 decks
-6%synergy
Idyllic Tutor
13%inclusion62 decks476 decks
9%synergy
Resurgent Belief
11%inclusion54 decks476 decks
9%synergy
Supreme Verdict
11%inclusion52 decks476 decks
-4%synergy
Demonic Counsel
10%inclusion48 decks476 decks
9%synergy
Space-Time Anomaly
10%inclusion31 decks308 decks
8%synergy
Replenish
9.5%inclusion45 decks476 decks
8%synergy
Buried Alive
9.0%inclusion43 decks476 decks
5%synergy
Unmarked Grave
7.8%inclusion37 decks476 decks
6%synergy
Ponder
7.1%inclusion34 decks476 decks
-2%synergy
Lively Dirge
6.5%inclusion31 decks476 decks
5%synergy
Austere Command
5.0%inclusion24 decks476 decks
-4%synergy
Utility Artifacts
Mesmeric Orb
18%inclusion87 decks476 decks
17%synergy
Cloud Key
13%inclusion63 decks476 decks
10%synergy
Lightning Greaves
8.6%inclusion41 decks476 decks
-14%synergy
Wayfarer's Bauble
7.1%inclusion34 decks476 decks
-1%synergy
Swiftfoot Boots
5.7%inclusion27 decks476 decks
-18%synergy
Keys to the House
5.0%inclusion24 decks476 decks
5%synergy
Enchantments
Amphibian Downpour
47%inclusion226 decks476 decks
43%synergy
Propaganda
44%inclusion211 decks476 decks
17%synergy
Grasp of Fate
43%inclusion207 decks476 decks
37%synergy
Seal of Cleansing
42%inclusion201 decks476 decks
41%synergy
Sigil of the Empty Throne
40%inclusion192 decks476 decks
34%synergy
Cemetery Tampering
40%inclusion189 decks476 decks
39%synergy
Ghostly Prison
37%inclusion177 decks476 decks
15%synergy
Estrid's Invocation
36%inclusion171 decks476 decks
31%synergy
Blind Obedience
34%inclusion161 decks476 decks
22%synergy
Starfield of Nyx
33%inclusion156 decks476 decks
29%synergy
Cacophony Unleashed
32%inclusion154 decks476 decks
31%synergy
Monologue Tax
31%inclusion146 decks476 decks
24%synergy
Dance of the Dead
29%inclusion137 decks476 decks
27%synergy
The Tale of Tamiyo
27%inclusion128 decks476 decks
26%synergy
Darksteel Mutation
24%inclusion116 decks476 decks
18%synergy
Stillness in Motion
24%inclusion100 decks414 decks
24%synergy
Seal of Removal
24%inclusion113 decks476 decks
23%synergy
The Meathook Massacre
24%inclusion112 decks476 decks
20%synergy
Phyrexian Arena
22%inclusion107 decks476 decks
8%synergy
Timely Ward
22%inclusion104 decks476 decks
17%synergy
Sheltered by Ghosts
22%inclusion104 decks476 decks
19%synergy
Imprisoned in the Moon
21%inclusion102 decks476 decks
15%synergy
Extravagant Replication
21%inclusion102 decks476 decks
16%synergy
Shark Typhoon
21%inclusion101 decks476 decks
15%synergy
Defiled Crypt // Cadaver Lab
21%inclusion100 decks476 decks
20%synergy
All That Glitters
20%inclusion97 decks476 decks
12%synergy
Ethereal Armor
20%inclusion97 decks476 decks
16%synergy
Out of the Tombs
20%inclusion96 decks476 decks
20%synergy
Polluted Cistern // Dim Oubliette
20%inclusion95 decks476 decks
19%synergy
Black Market Connections
20%inclusion95 decks476 decks
6%synergy
Greater Auramancy
20%inclusion95 decks476 decks
16%synergy
Copy Enchantment
18%inclusion87 decks476 decks
14%synergy
Touch the Spirit Realm
17%inclusion82 decks476 decks
15%synergy
Authority of the Consuls
17%inclusion80 decks476 decks
5%synergy
Leyline of Anticipation
17%inclusion80 decks476 decks
12%synergy
The Eldest Reborn
16%inclusion78 decks476 decks
14%synergy
Restricted Office // Lecture Hall
16%inclusion78 decks476 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion78 decks476 decks
14%synergy
Hallowed Haunting
16%inclusion78 decks476 decks
14%synergy
Bottomless Pool // Locker Room
15%inclusion73 decks476 decks
13%synergy
Static Prison
15%inclusion71 decks476 decks
14%synergy
Court of Cunning
14%inclusion69 decks476 decks
14%synergy
Teval's Judgment
14%inclusion60 decks420 decks
13%synergy
Secrets of the Dead
14%inclusion68 decks476 decks
14%synergy
Central Elevator // Promising Stairs
13%inclusion64 decks476 decks
13%synergy
Land Tax
13%inclusion64 decks476 decks
7%synergy
Nowhere to Run
13%inclusion64 decks476 decks
12%synergy
One with the Multiverse
13%inclusion62 decks476 decks
8%synergy
Oubliette
13%inclusion60 decks476 decks
11%synergy
Aura of Silence
13%inclusion60 decks476 decks
9%synergy
Battles
Invasion of Theros
7.6%inclusion36 decks476 decks
6%synergy
Utility Lands
Hall of Heliod's Generosity
65%inclusion308 decks476 decks
52%synergy
Bojuka Bog
43%inclusion207 decks476 decks
16%synergy
Cephalid Coliseum
19%inclusion90 decks476 decks
15%synergy
Otawara, Soaring City
17%inclusion83 decks476 decks
-2%synergy
Takenuma, Abandoned Mire
16%inclusion74 decks476 decks
9%synergy
Reliquary Tower
12%inclusion59 decks476 decks
-21%synergy
Halimar Depths
11%inclusion50 decks476 decks
6%synergy
Urborg, Tomb of Yawgmoth
7.4%inclusion35 decks476 decks
-6%synergy
Urza's Saga
6.3%inclusion30 decks476 decks
-6%synergy
Rogue's Passage
5.3%inclusion25 decks476 decks
-4%synergy
Adagia, Windswept Bastion
5.1%inclusion16 decks313 decks
3%synergy
Mana Artifacts
Sol Ring
88%inclusion421 decks476 decks
-1%synergy
Arcane Signet
88%inclusion419 decks476 decks
0%synergy
Talisman of Progress
50%inclusion240 decks476 decks
7%synergy
Talisman of Dominance
50%inclusion236 decks476 decks
0%synergy
Talisman of Hierarchy
45%inclusion214 decks476 decks
1%synergy
Azorius Signet
40%inclusion191 decks476 decks
9%synergy
Orzhov Signet
38%inclusion183 decks476 decks
5%synergy
Fellwar Stone
33%inclusion155 decks476 decks
-1%synergy
Dimir Signet
28%inclusion134 decks476 decks
-3%synergy
Mind Stone
15%inclusion71 decks476 decks
2%synergy
Commander's Sphere
12%inclusion57 decks476 decks
-7%synergy
Chromatic Lantern
6.5%inclusion31 decks476 decks
-7%synergy
Lands
Island
97%inclusion460 decks476 decks
4%synergy
Command Tower
96%inclusion459 decks476 decks
4%synergy
Swamp
96%inclusion459 decks476 decks
5%synergy
Plains
96%inclusion457 decks476 decks
4%synergy
Caves of Koilos
63%inclusion298 decks476 decks
27%synergy
Arcane Sanctum
62%inclusion293 decks476 decks
7%synergy
Adarkar Wastes
58%inclusion276 decks476 decks
27%synergy
Underground River
53%inclusion254 decks476 decks
20%synergy
Exotic Orchard
53%inclusion253 decks476 decks
-5%synergy
Watery Grave
53%inclusion253 decks476 decks
3%synergy
Godless Shrine
53%inclusion251 decks476 decks
2%synergy
Hallowed Fountain
51%inclusion241 decks476 decks
1%synergy
Polluted Delta
44%inclusion211 decks476 decks
7%synergy
Flooded Strand
44%inclusion211 decks476 decks
6%synergy
Raffine's Tower
43%inclusion205 decks476 decks
2%synergy
Glacial Fortress
41%inclusion193 decks476 decks
-1%synergy
Isolated Chapel
39%inclusion188 decks476 decks
-1%synergy
Marsh Flats
38%inclusion179 decks476 decks
1%synergy
Prairie Stream
35%inclusion165 decks476 decks
-6%synergy
Drowned Catacomb
34%inclusion162 decks476 decks
-3%synergy
Valgavoth's Lair
33%inclusion159 decks476 decks
31%synergy
Meticulous Archive
33%inclusion159 decks476 decks
20%synergy
Sunken Hollow
33%inclusion159 decks476 decks
-6%synergy
Sea of Clouds
32%inclusion154 decks476 decks
-3%synergy
Undercity Sewers
32%inclusion151 decks476 decks
17%synergy
Vault of Champions
31%inclusion149 decks476 decks
-1%synergy
Shadowy Backstreet
31%inclusion146 decks476 decks
18%synergy
Morphic Pool
28%inclusion135 decks476 decks
-6%synergy
Azorius Chancery
27%inclusion130 decks476 decks
13%synergy
Floodfarm Verge
27%inclusion128 decks476 decks
16%synergy
Terramorphic Expanse
27%inclusion127 decks476 decks
10%synergy
Evolving Wilds
27%inclusion127 decks476 decks
2%synergy
Temple of Silence
25%inclusion121 decks476 decks
6%synergy
Orzhov Basilica
25%inclusion117 decks476 decks
9%synergy
Obscura Storefront
24%inclusion116 decks476 decks
14%synergy
Temple of Enlightenment
24%inclusion115 decks476 decks
8%synergy
Deserted Beach
24%inclusion112 decks476 decks
3%synergy
Tainted Field
23%inclusion110 decks476 decks
16%synergy
Gloomlake Verge
23%inclusion109 decks476 decks
12%synergy
Dimir Aqueduct
23%inclusion108 decks476 decks
9%synergy
Temple of Deceit
22%inclusion106 decks476 decks
5%synergy
Contaminated Landscape
22%inclusion105 decks476 decks
8%synergy
Tainted Isle
21%inclusion99 decks476 decks
14%synergy
Shipwreck Marsh
21%inclusion99 decks476 decks
0%synergy
Ash Barrens
17%inclusion83 decks476 decks
7%synergy
Shattered Sanctum
16%inclusion78 decks476 decks
0%synergy
Path of Ancestry
16%inclusion75 decks476 decks
-12%synergy
Sink into Stupor
14%inclusion69 decks476 decks
2%synergy
Skycloud Expanse
13%inclusion64 decks476 decks
-1%synergy
Darkwater Catacombs
13%inclusion63 decks476 decks
-1%synergy
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