The Master of Keys (Commander) - Core

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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Air Nomad Legacy
2.6%inclusion1 decks39 decks
2%synergy
Waterbender Ascension
2.5%inclusion1 decks40 decks
1%synergy
Bender's Waterskin
2.2%inclusion2 decks89 decks
-1%synergy
The Spirit Oasis
2.2%inclusion1 decks45 decks
2%synergy
Northern Air Temple
2.2%inclusion1 decks46 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion283 decks370 decks
69%synergy
Mesa Enchantress
77%inclusion284 decks370 decks
68%synergy
Starfield Mystic
71%inclusion262 decks370 decks
64%synergy
Entity Tracker
66%inclusion244 decks370 decks
59%synergy
Demon of Fate's Design
63%inclusion233 decks370 decks
57%synergy
Doomwake Giant
63%inclusion232 decks370 decks
57%synergy
Ripples of Undeath
54%inclusion201 decks370 decks
52%synergy
Fear of Sleep Paralysis
57%inclusion211 decks370 decks
51%synergy
Scrabbling Skullcrab
51%inclusion189 decks370 decks
50%synergy
Gravebreaker Lamia
51%inclusion188 decks370 decks
50%synergy
Top Cards
Secret Arcade // Dusty Parlor
53%inclusion196 decks370 decks
48%synergy
Ondu Spiritdancer
52%inclusion192 decks370 decks
46%synergy
Sigil of the Empty Throne
52%inclusion192 decks370 decks
46%synergy
Swords to Plowshares
51%inclusion190 decks370 decks
-17%synergy
Mirrormade
51%inclusion187 decks370 decks
41%synergy
Sphere of Safety
50%inclusion185 decks370 decks
41%synergy
Redress Fate
47%inclusion174 decks370 decks
41%synergy
Victor, Valgavoth's Seneschal
46%inclusion170 decks370 decks
44%synergy
Fear of Impostors
41%inclusion153 decks370 decks
40%synergy
Seal of Cleansing
41%inclusion152 decks370 decks
40%synergy
Creatures
Overlord of the Floodpits
39%inclusion146 decks370 decks
36%synergy
Soaring Lightbringer
39%inclusion146 decks370 decks
34%synergy
Ghostly Dancers
38%inclusion141 decks370 decks
35%synergy
Overlord of the Balemurk
35%inclusion128 decks370 decks
33%synergy
Aminatou, Veil Piercer
32%inclusion119 decks370 decks
31%synergy
Heliod, the Radiant Dawn
31%inclusion114 decks370 decks
27%synergy
Moon-Blessed Cleric
31%inclusion114 decks370 decks
26%synergy
Zur, Eternal Schemer
29%inclusion109 decks370 decks
26%synergy
Enduring Curiosity
29%inclusion107 decks370 decks
21%synergy
Silent Hallcreeper
28%inclusion105 decks370 decks
24%synergy
Archon of Sun's Grace
28%inclusion104 decks370 decks
23%synergy
Grim Guardian
26%inclusion98 decks370 decks
24%synergy
Athreos, Shroud-Veiled
25%inclusion94 decks370 decks
21%synergy
Skullsnap Nuisance
22%inclusion83 decks370 decks
22%synergy
Archetype of Imagination
22%inclusion81 decks370 decks
17%synergy
Zur the Enchanter
22%inclusion80 decks370 decks
16%synergy
Mindwrack Harpy
21%inclusion77 decks370 decks
20%synergy
Sage of Mysteries
20%inclusion75 decks370 decks
20%synergy
Ancient Cellarspawn
20%inclusion73 decks370 decks
16%synergy
Alseid of Life's Bounty
17%inclusion64 decks370 decks
16%synergy
Overlord of the Mistmoors
17%inclusion62 decks370 decks
15%synergy
Balemurk Leech
17%inclusion62 decks370 decks
16%synergy
Nightmare Shepherd
16%inclusion58 decks370 decks
13%synergy
Spirited Companion
15%inclusion54 decks370 decks
13%synergy
Auramancer
15%inclusion54 decks370 decks
12%synergy
Gremlin Tamer
14%inclusion52 decks370 decks
13%synergy
Solemn Simulacrum
13%inclusion49 decks370 decks
-2%synergy
Nashi, Searcher in the Dark
13%inclusion48 decks370 decks
13%synergy
Fear of Infinity
13%inclusion47 decks370 decks
12%synergy
Summon: Yojimbo
12%inclusion16 decks134 decks
11%synergy
Metamorphosis Fanatic
10%inclusion36 decks370 decks
5%synergy
Starnheim Courser
9.5%inclusion35 decks370 decks
5%synergy
Arvinox, the Mind Flail
8.6%inclusion32 decks370 decks
7%synergy
Creeping Peeper
8.4%inclusion31 decks370 decks
8%synergy
Sun Titan
7.6%inclusion28 decks370 decks
-1%synergy
Millikin
7.6%inclusion28 decks370 decks
7%synergy
Burnished Hart
6.8%inclusion25 decks370 decks
3%synergy
Stenn, Paranoid Partisan
6.5%inclusion24 decks370 decks
5%synergy
Enduring Innocence
6.5%inclusion24 decks370 decks
5%synergy
Summon: Primal Odin
6.0%inclusion8 decks134 decks
2%synergy
Phenomenon Investigators
5.9%inclusion22 decks370 decks
5%synergy
Fear of Surveillance
5.9%inclusion22 decks370 decks
6%synergy
Stitcher's Supplier
5.9%inclusion22 decks370 decks
5%synergy
Witch Enchanter
5.9%inclusion22 decks370 decks
-1%synergy
Ghostly Keybearer
5.7%inclusion21 decks370 decks
6%synergy
Enduring Tenacity
5.4%inclusion20 decks370 decks
-2%synergy
Dream Eater
5.4%inclusion20 decks370 decks
5%synergy
Ashiok's Reaper
5.4%inclusion20 decks370 decks
5%synergy
Emet-Selch of the Third Seat
5.2%inclusion7 decks134 decks
-5%synergy
Fear of Failed Tests
5.1%inclusion19 decks370 decks
5%synergy
Instants
Arcane Denial
37%inclusion136 decks370 decks
16%synergy
Thirst for Meaning
31%inclusion113 decks370 decks
29%synergy
Path to Exile
28%inclusion104 decks370 decks
-14%synergy
Otherworldly Gaze
24%inclusion90 decks370 decks
22%synergy
Counterspell
24%inclusion88 decks370 decks
-17%synergy
Inkshield
22%inclusion81 decks370 decks
13%synergy
Void Rend
20%inclusion75 decks370 decks
-13%synergy
An Offer You Can't Refuse
18%inclusion66 decks370 decks
-9%synergy
Frantic Search
16%inclusion61 decks370 decks
-1%synergy
Negate
15%inclusion56 decks370 decks
-1%synergy
Utter End
15%inclusion55 decks370 decks
8%synergy
Brainstorm
13%inclusion49 decks370 decks
-4%synergy
Dark Ritual
10%inclusion38 decks370 decks
-9%synergy
Return to Dust
10%inclusion37 decks370 decks
6%synergy
Dovin's Veto
9.5%inclusion35 decks370 decks
-15%synergy
Generous Gift
7.8%inclusion29 decks370 decks
-7%synergy
Fact or Fiction
7.0%inclusion26 decks370 decks
3%synergy
Fell the Profane
6.5%inclusion24 decks370 decks
-2%synergy
Entomb
6.5%inclusion24 decks370 decks
0%synergy
Sink into Stupor
6.2%inclusion23 decks370 decks
-6%synergy
Unwanted Remake
5.9%inclusion22 decks370 decks
5%synergy
Anguished Unmaking
5.9%inclusion22 decks370 decks
-19%synergy
Swan Song
5.9%inclusion22 decks370 decks
-13%synergy
Telling Time
5.4%inclusion20 decks370 decks
3%synergy
Withering Torment
5.4%inclusion20 decks370 decks
4%synergy
Sorceries
Sevinne's Reclamation
31%inclusion114 decks370 decks
22%synergy
Time Wipe
27%inclusion99 decks370 decks
20%synergy
Extinguish All Hope
25%inclusion92 decks370 decks
23%synergy
Dance of the Manse
24%inclusion88 decks370 decks
20%synergy
Windfall
17%inclusion62 decks370 decks
3%synergy
Singularity Rupture
16%inclusion16 decks102 decks
13%synergy
Resurgent Belief
13%inclusion49 decks370 decks
11%synergy
Damn
12%inclusion46 decks370 decks
-8%synergy
Reanimate
11%inclusion41 decks370 decks
-5%synergy
Terminus
11%inclusion40 decks370 decks
7%synergy
Ponder
10%inclusion38 decks370 decks
1%synergy
Glimpse the Unthinkable
10%inclusion36 decks370 decks
9%synergy
Space-Time Anomaly
9.0%inclusion9 decks100 decks
7%synergy
Read the Bones
8.4%inclusion31 decks370 decks
4%synergy
Brilliant Restoration
8.1%inclusion30 decks370 decks
6%synergy
Toxic Deluge
7.6%inclusion28 decks370 decks
-12%synergy
Austere Command
5.9%inclusion22 decks370 decks
-3%synergy
Diabolic Vision
5.9%inclusion22 decks370 decks
4%synergy
Portent
5.9%inclusion22 decks370 decks
2%synergy
Commune with Evil
5.4%inclusion20 decks370 decks
5%synergy
Open the Vaults
5.4%inclusion20 decks370 decks
4%synergy
Aminatou's Augury
5.1%inclusion19 decks370 decks
4%synergy
Utility Artifacts
Cloud Key
12%inclusion44 decks370 decks
9%synergy
Keys to the House
9.5%inclusion35 decks369 decks
9%synergy
Wayfarer's Bauble
9.5%inclusion35 decks370 decks
1%synergy
Lightning Greaves
8.6%inclusion32 decks370 decks
-14%synergy
Mesmeric Orb
7.6%inclusion28 decks370 decks
6%synergy
Perpetual Timepiece
5.7%inclusion21 decks370 decks
5%synergy
Whip of Erebos
5.7%inclusion21 decks370 decks
4%synergy
Swiftfoot Boots
5.1%inclusion19 decks370 decks
-19%synergy
Enchantments
Animate Dead
41%inclusion152 decks370 decks
31%synergy
Grasp of Fate
41%inclusion151 decks370 decks
35%synergy
Dress Down
41%inclusion150 decks370 decks
38%synergy
Cemetery Tampering
38%inclusion142 decks370 decks
38%synergy
Defiled Crypt // Cadaver Lab
38%inclusion141 decks369 decks
37%synergy
Monologue Tax
38%inclusion141 decks370 decks
32%synergy
Cacophony Unleashed
35%inclusion128 decks370 decks
33%synergy
Propaganda
34%inclusion125 decks370 decks
7%synergy
Shark Typhoon
33%inclusion122 decks370 decks
27%synergy
Bottomless Pool // Locker Room
31%inclusion116 decks370 decks
29%synergy
Timely Ward
31%inclusion114 decks370 decks
26%synergy
Estrid's Invocation
31%inclusion113 decks370 decks
26%synergy
Amphibian Downpour
30%inclusion111 decks370 decks
25%synergy
Ethereal Armor
29%inclusion108 decks370 decks
24%synergy
Extravagant Replication
29%inclusion107 decks370 decks
24%synergy
All That Glitters
28%inclusion102 decks370 decks
19%synergy
Ghostly Prison
28%inclusion102 decks370 decks
6%synergy
Polluted Cistern // Dim Oubliette
27%inclusion100 decks370 decks
26%synergy
Mystic Remora
26%inclusion97 decks370 decks
5%synergy
The Eldest Reborn
26%inclusion96 decks370 decks
23%synergy
Cramped Vents // Access Maze
26%inclusion95 decks370 decks
23%synergy
Stillness in Motion
26%inclusion42 decks164 decks
25%synergy
Necromancy
25%inclusion92 decks370 decks
20%synergy
The Tale of Tamiyo
24%inclusion89 decks370 decks
24%synergy
Darksteel Mutation
24%inclusion87 decks370 decks
17%synergy
Mirror Room // Fractured Realm
22%inclusion83 decks370 decks
20%synergy
Starfield of Nyx
22%inclusion80 decks370 decks
18%synergy
Restricted Office // Lecture Hall
22%inclusion80 decks370 decks
19%synergy
Blind Obedience
19%inclusion71 decks370 decks
7%synergy
Central Elevator // Promising Stairs
19%inclusion71 decks370 decks
19%synergy
Imprisoned in the Moon
19%inclusion70 decks370 decks
12%synergy
Sheltered by Ghosts
19%inclusion69 decks370 decks
16%synergy
Secrets of the Dead
18%inclusion68 decks370 decks
18%synergy
Seal of Removal
18%inclusion68 decks370 decks
18%synergy
Hallowed Haunting
18%inclusion67 decks370 decks
16%synergy
Dazzling Theater // Prop Room
18%inclusion66 decks369 decks
16%synergy
One with the Multiverse
18%inclusion66 decks370 decks
13%synergy
Derelict Attic // Widow's Walk
18%inclusion65 decks368 decks
17%synergy
Phyrexian Arena
17%inclusion64 decks370 decks
3%synergy
Cast Out
17%inclusion64 decks370 decks
14%synergy
Meat Locker // Drowned Diner
16%inclusion60 decks368 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion57 decks369 decks
15%synergy
Copy Enchantment
15%inclusion57 decks370 decks
11%synergy
Spirit-Sister's Call
15%inclusion55 decks370 decks
14%synergy
Unable to Scream
15%inclusion55 decks370 decks
14%synergy
Surgical Suite // Hospital Room
14%inclusion52 decks370 decks
14%synergy
Teval's Judgment
14%inclusion23 decks167 decks
13%synergy
Funeral Room // Awakening Hall
14%inclusion50 decks370 decks
13%synergy
Nowhere to Run
13%inclusion49 decks370 decks
12%synergy
Court of Cunning
13%inclusion48 decks370 decks
12%synergy
Battles
Invasion of Theros
10%inclusion37 decks370 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
60%inclusion221 decks370 decks
47%synergy
Bojuka Bog
49%inclusion180 decks370 decks
21%synergy
Halimar Depths
20%inclusion75 decks370 decks
15%synergy
Reliquary Tower
11%inclusion39 decks370 decks
-23%synergy
Cephalid Coliseum
7.8%inclusion29 decks370 decks
4%synergy
Takenuma, Abandoned Mire
6.2%inclusion23 decks370 decks
0%synergy
Nephalia Drownyard
5.9%inclusion22 decks370 decks
5%synergy
Adagia, Windswept Bastion
5.9%inclusion6 decks102 decks
3%synergy
Otawara, Soaring City
5.7%inclusion21 decks370 decks
-13%synergy
Mana Artifacts
Arcane Signet
88%inclusion326 decks370 decks
0%synergy
Sol Ring
81%inclusion300 decks370 decks
-9%synergy
Azorius Signet
56%inclusion207 decks370 decks
23%synergy
Orzhov Signet
53%inclusion195 decks370 decks
18%synergy
Talisman of Dominance
43%inclusion159 decks370 decks
-6%synergy
Talisman of Progress
41%inclusion150 decks370 decks
-2%synergy
Talisman of Hierarchy
37%inclusion136 decks370 decks
-6%synergy
Dimir Signet
35%inclusion131 decks370 decks
3%synergy
Mind Stone
25%inclusion93 decks370 decks
12%synergy
Fellwar Stone
25%inclusion92 decks370 decks
-9%synergy
Commander's Sphere
24%inclusion90 decks370 decks
5%synergy
Chromatic Lantern
7.8%inclusion29 decks370 decks
-6%synergy
Lands
Island
99%inclusion365 decks370 decks
6%synergy
Plains
98%inclusion361 decks370 decks
6%synergy
Swamp
97%inclusion358 decks370 decks
6%synergy
Command Tower
94%inclusion347 decks370 decks
1%synergy
Arcane Sanctum
73%inclusion269 decks370 decks
18%synergy
Adarkar Wastes
64%inclusion235 decks370 decks
33%synergy
Caves of Koilos
63%inclusion234 decks370 decks
28%synergy
Underground River
55%inclusion204 decks370 decks
23%synergy
Exotic Orchard
48%inclusion179 decks370 decks
-10%synergy
Obscura Storefront
46%inclusion171 decks370 decks
36%synergy
Evolving Wilds
44%inclusion163 decks370 decks
19%synergy
Terramorphic Expanse
44%inclusion163 decks370 decks
27%synergy
Temple of Enlightenment
43%inclusion158 decks370 decks
26%synergy
Temple of Silence
42%inclusion155 decks370 decks
22%synergy
Temple of Deceit
42%inclusion154 decks370 decks
23%synergy
Dimir Aqueduct
39%inclusion146 decks370 decks
25%synergy
Azorius Chancery
39%inclusion144 decks370 decks
24%synergy
Prairie Stream
38%inclusion142 decks370 decks
-2%synergy
Glacial Fortress
37%inclusion136 decks370 decks
-3%synergy
Contaminated Landscape
35%inclusion131 decks370 decks
21%synergy
Tainted Field
35%inclusion130 decks370 decks
28%synergy
Orzhov Basilica
35%inclusion130 decks370 decks
19%synergy
Isolated Chapel
35%inclusion128 decks370 decks
-4%synergy
Sunken Hollow
34%inclusion124 decks370 decks
-6%synergy
Tainted Isle
33%inclusion123 decks370 decks
27%synergy
Valgavoth's Lair
32%inclusion119 decks370 decks
29%synergy
Drowned Catacomb
32%inclusion117 decks370 decks
-4%synergy
Ash Barrens
29%inclusion106 decks370 decks
18%synergy
Godless Shrine
25%inclusion91 decks370 decks
-25%synergy
Raffine's Tower
24%inclusion89 decks370 decks
-17%synergy
Watery Grave
23%inclusion86 decks370 decks
-26%synergy
Hallowed Fountain
22%inclusion82 decks370 decks
-27%synergy
Flooded Strand
20%inclusion73 decks370 decks
-18%synergy
Shadowy Backstreet
19%inclusion70 decks370 decks
7%synergy
Meticulous Archive
19%inclusion70 decks370 decks
5%synergy
Sea of Clouds
19%inclusion69 decks370 decks
-17%synergy
Polluted Delta
18%inclusion68 decks370 decks
-19%synergy
Undercity Sewers
18%inclusion66 decks370 decks
4%synergy
Vault of Champions
17%inclusion63 decks370 decks
-16%synergy
Floodfarm Verge
17%inclusion63 decks370 decks
6%synergy
Marsh Flats
17%inclusion62 decks370 decks
-19%synergy
Gloomlake Verge
16%inclusion59 decks370 decks
5%synergy
Shipwreck Marsh
15%inclusion56 decks370 decks
-6%synergy
Thriving Isle
15%inclusion56 decks370 decks
11%synergy
Thriving Moor
15%inclusion55 decks370 decks
10%synergy
Skycloud Expanse
15%inclusion54 decks370 decks
0%synergy
Morphic Pool
15%inclusion54 decks370 decks
-20%synergy
Thriving Heath
15%inclusion54 decks370 decks
10%synergy
Darkwater Catacombs
14%inclusion51 decks370 decks
-1%synergy
Deserted Beach
14%inclusion51 decks370 decks
-7%synergy
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