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
Chakra Meditation
2.7%inclusion2 decks75 decks
3%synergy
The Spirit Oasis
1.2%inclusion1 decks81 decks
1%synergy
Northern Air Temple
1.2%inclusion1 decks83 decks
1%synergy
The Legend of Yangchen
1.2%inclusion1 decks83 decks
1%synergy
Airbender Ascension
1.1%inclusion1 decks87 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
77%inclusion302 decks390 decks
70%synergy
Ripples of Undeath
72%inclusion281 decks390 decks
69%synergy
Entity Tracker
71%inclusion277 decks390 decks
64%synergy
Starfield Mystic
66%inclusion258 decks390 decks
59%synergy
Gravebreaker Lamia
59%inclusion231 decks390 decks
58%synergy
Mesa Enchantress
67%inclusion262 decks390 decks
58%synergy
Animate Dead
67%inclusion262 decks390 decks
57%synergy
Demon of Fate's Design
59%inclusion229 decks390 decks
53%synergy
Scrabbling Skullcrab
54%inclusion211 decks390 decks
53%synergy
Dress Down
55%inclusion216 decks390 decks
53%synergy
Top Cards
Fear of Sleep Paralysis
58%inclusion225 decks390 decks
52%synergy
Doomwake Giant
54%inclusion211 decks390 decks
48%synergy
Mystic Remora
53%inclusion207 decks390 decks
32%synergy
Necromancy
52%inclusion204 decks390 decks
48%synergy
Sphere of Safety
51%inclusion200 decks390 decks
42%synergy
Overlord of the Floodpits
51%inclusion197 decks390 decks
47%synergy
Secret Arcade // Dusty Parlor
51%inclusion197 decks390 decks
45%synergy
Swords to Plowshares
51%inclusion197 decks390 decks
-18%synergy
Mirrormade
49%inclusion192 decks390 decks
39%synergy
Overlord of the Balemurk
48%inclusion187 decks390 decks
46%synergy
Game Changers
Smothering Tithe
39%inclusion153 decks390 decks
7%synergy
Rhystic Study
29%inclusion114 decks390 decks
-3%synergy
Enlightened Tutor
13%inclusion49 decks390 decks
-8%synergy
Gifts Ungiven
9.5%inclusion37 decks390 decks
7%synergy
Necropotence
8.2%inclusion32 decks390 decks
1%synergy
Serra's Sanctum
6.7%inclusion26 decks390 decks
5%synergy
Cyclonic Rift
6.4%inclusion25 decks390 decks
-19%synergy
Demonic Tutor
5.9%inclusion23 decks390 decks
-16%synergy
Creatures
Victor, Valgavoth's Seneschal
46%inclusion181 decks390 decks
44%synergy
Fear of Impostors
45%inclusion177 decks390 decks
44%synergy
Ondu Spiritdancer
45%inclusion177 decks390 decks
39%synergy
Zur, Eternal Schemer
44%inclusion173 decks390 decks
41%synergy
Silent Hallcreeper
33%inclusion130 decks390 decks
29%synergy
Zur the Enchanter
32%inclusion126 decks390 decks
27%synergy
Ghostly Dancers
32%inclusion123 decks390 decks
29%synergy
Enduring Curiosity
27%inclusion104 decks390 decks
19%synergy
Heliod, the Radiant Dawn
26%inclusion101 decks390 decks
22%synergy
Moon-Blessed Cleric
25%inclusion96 decks390 decks
20%synergy
Soaring Lightbringer
24%inclusion94 decks390 decks
19%synergy
Grim Guardian
24%inclusion93 decks390 decks
21%synergy
Archon of Sun's Grace
23%inclusion88 decks390 decks
18%synergy
Abdel Adrian, Gorion's Ward
20%inclusion78 decks390 decks
18%synergy
Sage of Mysteries
18%inclusion69 decks390 decks
17%synergy
Mindwrack Harpy
17%inclusion67 decks390 decks
17%synergy
Overlord of the Mistmoors
17%inclusion66 decks390 decks
15%synergy
Aminatou, Veil Piercer
17%inclusion66 decks390 decks
15%synergy
Archetype of Imagination
15%inclusion58 decks390 decks
10%synergy
Alseid of Life's Bounty
14%inclusion55 decks390 decks
13%synergy
Balemurk Leech
13%inclusion52 decks390 decks
13%synergy
Athreos, Shroud-Veiled
13%inclusion51 decks390 decks
9%synergy
Lotho, Corrupt Shirriff
13%inclusion50 decks390 decks
-4%synergy
Ancient Cellarspawn
12%inclusion47 decks390 decks
9%synergy
Hullbreaker Horror
12%inclusion47 decks390 decks
6%synergy
Hedron Crab
12%inclusion45 decks390 decks
11%synergy
Sun Titan
11%inclusion43 decks390 decks
2%synergy
Ledger Shredder
11%inclusion41 decks390 decks
2%synergy
Skullsnap Nuisance
10%inclusion40 decks390 decks
10%synergy
Nashi, Searcher in the Dark
10%inclusion40 decks390 decks
10%synergy
Lurrus of the Dream-Den
10%inclusion38 decks390 decks
8%synergy
Esper Sentinel
10%inclusion38 decks390 decks
-18%synergy
Gremlin Tamer
10%inclusion38 decks390 decks
9%synergy
Witch Enchanter
9.5%inclusion37 decks390 decks
3%synergy
Solemn Simulacrum
8.2%inclusion32 decks390 decks
-7%synergy
Spirited Companion
7.7%inclusion30 decks390 decks
6%synergy
Valgavoth, Terror Eater
7.4%inclusion29 decks390 decks
4%synergy
Fear of Infinity
6.9%inclusion27 decks390 decks
6%synergy
Nightmare Shepherd
6.9%inclusion27 decks390 decks
4%synergy
Grand Abolisher
6.9%inclusion27 decks390 decks
-8%synergy
Summon: Yojimbo
6.8%inclusion18 decks266 decks
6%synergy
Metamorphosis Fanatic
6.7%inclusion26 decks390 decks
2%synergy
Valley Floodcaller
6.7%inclusion26 decks390 decks
2%synergy
Auramancer
6.4%inclusion25 decks390 decks
3%synergy
Starnheim Courser
6.2%inclusion24 decks390 decks
2%synergy
Stenn, Paranoid Partisan
6.2%inclusion24 decks390 decks
5%synergy
Enduring Tenacity
6.2%inclusion24 decks390 decks
-1%synergy
Laboratory Maniac
5.9%inclusion23 decks390 decks
2%synergy
Neerdiv, Devious Diver
5.7%inclusion22 decks388 decks
6%synergy
Summon: Primal Odin
5.6%inclusion15 decks269 decks
2%synergy
Instants
Arcane Denial
35%inclusion135 decks390 decks
14%synergy
Counterspell
34%inclusion131 decks390 decks
-8%synergy
An Offer You Can't Refuse
29%inclusion114 decks390 decks
3%synergy
Path to Exile
26%inclusion102 decks390 decks
-16%synergy
Entomb
26%inclusion100 decks390 decks
19%synergy
Dark Ritual
26%inclusion100 decks390 decks
6%synergy
Void Rend
19%inclusion74 decks390 decks
-14%synergy
Thirst for Meaning
16%inclusion64 decks390 decks
15%synergy
Swan Song
16%inclusion64 decks390 decks
-3%synergy
Inkshield
16%inclusion64 decks390 decks
7%synergy
Dovin's Veto
16%inclusion61 decks390 decks
-9%synergy
Frantic Search
15%inclusion60 decks390 decks
-1%synergy
Sink into Stupor
15%inclusion58 decks390 decks
2%synergy
Negate
14%inclusion54 decks390 decks
-3%synergy
Otherworldly Gaze
13%inclusion52 decks390 decks
11%synergy
Fell the Profane
12%inclusion47 decks390 decks
4%synergy
Mana Drain
11%inclusion44 decks390 decks
-6%synergy
Brainstorm
11%inclusion41 decks390 decks
-7%synergy
Anguished Unmaking
9.2%inclusion36 decks390 decks
-15%synergy
Faithful Mending
6.4%inclusion25 decks390 decks
2%synergy
Generous Gift
6.2%inclusion24 decks390 decks
-9%synergy
Utter End
5.9%inclusion23 decks390 decks
-1%synergy
Fact or Fiction
5.6%inclusion22 decks390 decks
2%synergy
Cabal Ritual
5.4%inclusion21 decks390 decks
2%synergy
Return to Dust
5.1%inclusion20 decks390 decks
1%synergy
Waterlogged Teachings
5.1%inclusion20 decks390 decks
1%synergy
Sorceries
Sevinne's Reclamation
47%inclusion185 decks390 decks
39%synergy
Redress Fate
36%inclusion141 decks390 decks
30%synergy
Windfall
25%inclusion98 decks390 decks
11%synergy
Reanimate
23%inclusion88 decks390 decks
7%synergy
Singularity Rupture
22%inclusion49 decks220 decks
20%synergy
Extinguish All Hope
21%inclusion80 decks390 decks
19%synergy
Dance of the Manse
19%inclusion74 decks390 decks
15%synergy
Time Wipe
16%inclusion61 decks390 decks
8%synergy
Damn
15%inclusion59 decks390 decks
-5%synergy
Idyllic Tutor
15%inclusion58 decks390 decks
11%synergy
Toxic Deluge
15%inclusion58 decks390 decks
-5%synergy
Glimpse the Unthinkable
14%inclusion53 decks390 decks
13%synergy
Supreme Verdict
12%inclusion45 decks390 decks
-3%synergy
Demonic Counsel
11%inclusion43 decks390 decks
10%synergy
Resurgent Belief
11%inclusion42 decks390 decks
9%synergy
Space-Time Anomaly
10%inclusion21 decks214 decks
8%synergy
Buried Alive
10%inclusion38 decks390 decks
6%synergy
Replenish
8.2%inclusion32 decks390 decks
6%synergy
Unmarked Grave
7.7%inclusion30 decks390 decks
6%synergy
Farewell
7.7%inclusion30 decks390 decks
-5%synergy
Ponder
6.7%inclusion26 decks390 decks
-3%synergy
Lively Dirge
5.9%inclusion23 decks390 decks
5%synergy
Traumatize
5.4%inclusion21 decks390 decks
5%synergy
Open the Vaults
5.1%inclusion20 decks390 decks
4%synergy
Utility Artifacts
Mesmeric Orb
19%inclusion75 decks390 decks
18%synergy
Cloud Key
13%inclusion49 decks390 decks
9%synergy
Lightning Greaves
9.0%inclusion35 decks390 decks
-13%synergy
Wayfarer's Bauble
7.7%inclusion30 decks390 decks
-1%synergy
Swiftfoot Boots
5.4%inclusion21 decks390 decks
-18%synergy
Keys to the House
5.4%inclusion21 decks390 decks
5%synergy
Crucible of Worlds
5.1%inclusion20 decks390 decks
4%synergy
Enchantments
Propaganda
46%inclusion178 decks390 decks
20%synergy
Amphibian Downpour
45%inclusion177 decks390 decks
41%synergy
Grasp of Fate
43%inclusion166 decks390 decks
36%synergy
Seal of Cleansing
42%inclusion163 decks390 decks
40%synergy
Cemetery Tampering
40%inclusion157 decks390 decks
40%synergy
Sigil of the Empty Throne
40%inclusion157 decks390 decks
34%synergy
Ghostly Prison
37%inclusion144 decks390 decks
15%synergy
Estrid's Invocation
35%inclusion137 decks390 decks
31%synergy
Blind Obedience
35%inclusion135 decks390 decks
22%synergy
Starfield of Nyx
33%inclusion128 decks390 decks
29%synergy
Cacophony Unleashed
32%inclusion126 decks390 decks
31%synergy
Monologue Tax
30%inclusion116 decks390 decks
24%synergy
Dance of the Dead
28%inclusion110 decks390 decks
26%synergy
The Tale of Tamiyo
27%inclusion105 decks390 decks
26%synergy
Stillness in Motion
24%inclusion78 decks326 decks
24%synergy
Darksteel Mutation
24%inclusion92 decks390 decks
17%synergy
Phyrexian Arena
24%inclusion92 decks390 decks
10%synergy
Defiled Crypt // Cadaver Lab
23%inclusion91 decks390 decks
23%synergy
Seal of Removal
23%inclusion90 decks390 decks
22%synergy
The Meathook Massacre
23%inclusion89 decks390 decks
19%synergy
Polluted Cistern // Dim Oubliette
22%inclusion85 decks390 decks
21%synergy
Timely Ward
22%inclusion84 decks390 decks
17%synergy
Extravagant Replication
22%inclusion84 decks390 decks
16%synergy
Shark Typhoon
20%inclusion79 decks390 decks
14%synergy
All That Glitters
20%inclusion79 decks390 decks
11%synergy
Out of the Tombs
20%inclusion77 decks390 decks
19%synergy
Sheltered by Ghosts
19%inclusion75 decks390 decks
17%synergy
Black Market Connections
19%inclusion75 decks390 decks
5%synergy
Greater Auramancy
19%inclusion74 decks390 decks
14%synergy
Copy Enchantment
19%inclusion73 decks390 decks
14%synergy
Touch the Spirit Realm
18%inclusion70 decks390 decks
15%synergy
Ethereal Armor
18%inclusion70 decks390 decks
13%synergy
Imprisoned in the Moon
17%inclusion65 decks390 decks
10%synergy
Hallowed Haunting
16%inclusion64 decks390 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion64 decks390 decks
14%synergy
Authority of the Consuls
16%inclusion63 decks390 decks
5%synergy
Restricted Office // Lecture Hall
16%inclusion63 decks390 decks
14%synergy
The Eldest Reborn
16%inclusion62 decks390 decks
13%synergy
Leyline of Anticipation
16%inclusion62 decks390 decks
11%synergy
Static Prison
16%inclusion61 decks390 decks
15%synergy
Bottomless Pool // Locker Room
16%inclusion61 decks390 decks
13%synergy
Secrets of the Dead
15%inclusion58 decks390 decks
15%synergy
Central Elevator // Promising Stairs
14%inclusion55 decks390 decks
13%synergy
One with the Multiverse
13%inclusion52 decks390 decks
9%synergy
Court of Cunning
13%inclusion52 decks390 decks
12%synergy
Cramped Vents // Access Maze
13%inclusion51 decks390 decks
10%synergy
Teval's Judgment
13%inclusion43 decks332 decks
12%synergy
Land Tax
13%inclusion50 decks390 decks
7%synergy
Nowhere to Run
12%inclusion48 decks390 decks
11%synergy
Oubliette
12%inclusion47 decks390 decks
11%synergy
Battles
Invasion of Theros
10%inclusion38 decks390 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
66%inclusion256 decks390 decks
52%synergy
Bojuka Bog
41%inclusion160 decks390 decks
14%synergy
Cephalid Coliseum
19%inclusion73 decks390 decks
15%synergy
Otawara, Soaring City
18%inclusion69 decks390 decks
-1%synergy
Takenuma, Abandoned Mire
16%inclusion62 decks390 decks
9%synergy
Reliquary Tower
12%inclusion48 decks390 decks
-21%synergy
Halimar Depths
10%inclusion38 decks390 decks
5%synergy
Urborg, Tomb of Yawgmoth
9.0%inclusion35 decks390 decks
-4%synergy
Urza's Saga
5.4%inclusion21 decks390 decks
-7%synergy
Nephalia Drownyard
5.1%inclusion20 decks390 decks
5%synergy
Adagia, Windswept Bastion
5.0%inclusion11 decks220 decks
2%synergy
Mana Artifacts
Arcane Signet
88%inclusion344 decks390 decks
0%synergy
Sol Ring
87%inclusion341 decks390 decks
-3%synergy
Talisman of Dominance
50%inclusion196 decks390 decks
1%synergy
Talisman of Progress
50%inclusion195 decks390 decks
7%synergy
Talisman of Hierarchy
46%inclusion179 decks390 decks
3%synergy
Azorius Signet
39%inclusion154 decks390 decks
7%synergy
Orzhov Signet
39%inclusion153 decks390 decks
4%synergy
Fellwar Stone
32%inclusion123 decks390 decks
-3%synergy
Dimir Signet
26%inclusion103 decks390 decks
-7%synergy
Mind Stone
15%inclusion60 decks390 decks
2%synergy
Commander's Sphere
13%inclusion50 decks390 decks
-7%synergy
Chromatic Lantern
7.4%inclusion29 decks390 decks
-6%synergy
Thought Vessel
5.1%inclusion20 decks390 decks
-19%synergy
Lands
Island
96%inclusion376 decks390 decks
4%synergy
Plains
96%inclusion375 decks390 decks
5%synergy
Swamp
96%inclusion375 decks390 decks
5%synergy
Command Tower
95%inclusion371 decks390 decks
3%synergy
Caves of Koilos
62%inclusion242 decks390 decks
27%synergy
Arcane Sanctum
60%inclusion234 decks390 decks
5%synergy
Adarkar Wastes
58%inclusion225 decks390 decks
27%synergy
Underground River
52%inclusion204 decks390 decks
20%synergy
Exotic Orchard
52%inclusion201 decks390 decks
-7%synergy
Godless Shrine
51%inclusion200 decks390 decks
1%synergy
Watery Grave
51%inclusion197 decks390 decks
1%synergy
Hallowed Fountain
48%inclusion188 decks390 decks
-1%synergy
Flooded Strand
45%inclusion175 decks390 decks
7%synergy
Raffine's Tower
44%inclusion171 decks390 decks
3%synergy
Polluted Delta
43%inclusion169 decks390 decks
6%synergy
Isolated Chapel
39%inclusion153 decks390 decks
1%synergy
Glacial Fortress
39%inclusion152 decks390 decks
0%synergy
Marsh Flats
37%inclusion146 decks390 decks
1%synergy
Valgavoth's Lair
34%inclusion132 decks390 decks
31%synergy
Prairie Stream
34%inclusion131 decks390 decks
-7%synergy
Sunken Hollow
33%inclusion129 decks390 decks
-7%synergy
Meticulous Archive
32%inclusion126 decks390 decks
19%synergy
Sea of Clouds
32%inclusion124 decks390 decks
-4%synergy
Drowned Catacomb
32%inclusion123 decks390 decks
-3%synergy
Undercity Sewers
31%inclusion121 decks390 decks
17%synergy
Vault of Champions
31%inclusion121 decks390 decks
-2%synergy
Shadowy Backstreet
31%inclusion119 decks390 decks
18%synergy
Morphic Pool
28%inclusion108 decks390 decks
-7%synergy
Temple of Silence
27%inclusion105 decks390 decks
7%synergy
Temple of Enlightenment
27%inclusion104 decks390 decks
10%synergy
Terramorphic Expanse
26%inclusion102 decks390 decks
9%synergy
Azorius Chancery
26%inclusion102 decks390 decks
11%synergy
Floodfarm Verge
26%inclusion101 decks390 decks
15%synergy
Temple of Deceit
25%inclusion98 decks390 decks
7%synergy
Deserted Beach
24%inclusion95 decks390 decks
4%synergy
Evolving Wilds
24%inclusion94 decks390 decks
-1%synergy
Orzhov Basilica
24%inclusion93 decks390 decks
8%synergy
Tainted Field
23%inclusion91 decks390 decks
16%synergy
Obscura Storefront
23%inclusion91 decks390 decks
13%synergy
Dimir Aqueduct
23%inclusion90 decks390 decks
9%synergy
Contaminated Landscape
22%inclusion87 decks390 decks
8%synergy
Gloomlake Verge
22%inclusion87 decks390 decks
11%synergy
Tainted Isle
21%inclusion81 decks390 decks
14%synergy
Shipwreck Marsh
21%inclusion81 decks390 decks
0%synergy
Shattered Sanctum
17%inclusion66 decks390 decks
1%synergy
Ash Barrens
15%inclusion60 decks390 decks
5%synergy
Path of Ancestry
15%inclusion59 decks390 decks
-12%synergy
Sink into Stupor
15%inclusion58 decks390 decks
2%synergy
Skycloud Expanse
13%inclusion51 decks390 decks
-2%synergy
Darkwater Catacombs
13%inclusion51 decks390 decks
-1%synergy
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