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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Sorceries
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Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
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Noggle the Mind
4.8%inclusion2 decks42 decks
4%synergy
Grave Venerations
2.3%inclusion1 decks44 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion299 decks392 decks
69%synergy
Mesa Enchantress
77%inclusion300 decks392 decks
68%synergy
Starfield Mystic
70%inclusion276 decks392 decks
64%synergy
Entity Tracker
66%inclusion258 decks392 decks
59%synergy
Demon of Fate's Design
63%inclusion248 decks392 decks
58%synergy
Doomwake Giant
62%inclusion244 decks392 decks
56%synergy
Fear of Sleep Paralysis
58%inclusion227 decks392 decks
52%synergy
Ripples of Undeath
53%inclusion209 decks392 decks
51%synergy
Scrabbling Skullcrab
51%inclusion199 decks392 decks
50%synergy
Gravebreaker Lamia
51%inclusion198 decks392 decks
50%synergy
Top Cards
Secret Arcade // Dusty Parlor
53%inclusion206 decks392 decks
48%synergy
Sigil of the Empty Throne
52%inclusion203 decks392 decks
46%synergy
Ondu Spiritdancer
51%inclusion200 decks392 decks
45%synergy
Swords to Plowshares
51%inclusion198 decks392 decks
-18%synergy
Mirrormade
50%inclusion197 decks392 decks
40%synergy
Sphere of Safety
49%inclusion192 decks392 decks
40%synergy
Redress Fate
46%inclusion180 decks392 decks
40%synergy
Victor, Valgavoth's Seneschal
45%inclusion177 decks392 decks
43%synergy
Fear of Impostors
42%inclusion166 decks392 decks
41%synergy
Dress Down
41%inclusion161 decks392 decks
39%synergy
Creatures
Soaring Lightbringer
39%inclusion153 decks392 decks
34%synergy
Overlord of the Floodpits
39%inclusion152 decks392 decks
35%synergy
Ghostly Dancers
38%inclusion147 decks392 decks
35%synergy
Overlord of the Balemurk
34%inclusion133 decks392 decks
32%synergy
Moon-Blessed Cleric
32%inclusion124 decks392 decks
27%synergy
Aminatou, Veil Piercer
31%inclusion123 decks392 decks
30%synergy
Heliod, the Radiant Dawn
30%inclusion117 decks392 decks
26%synergy
Silent Hallcreeper
29%inclusion115 decks392 decks
25%synergy
Zur, Eternal Schemer
29%inclusion114 decks392 decks
26%synergy
Archon of Sun's Grace
28%inclusion111 decks392 decks
24%synergy
Enduring Curiosity
28%inclusion109 decks392 decks
20%synergy
Grim Guardian
27%inclusion104 decks392 decks
24%synergy
Athreos, Shroud-Veiled
26%inclusion102 decks392 decks
22%synergy
Archetype of Imagination
23%inclusion89 decks392 decks
18%synergy
Skullsnap Nuisance
22%inclusion85 decks392 decks
21%synergy
Zur the Enchanter
21%inclusion82 decks392 decks
16%synergy
Sage of Mysteries
20%inclusion79 decks392 decks
20%synergy
Mindwrack Harpy
20%inclusion79 decks392 decks
20%synergy
Ancient Cellarspawn
20%inclusion77 decks392 decks
16%synergy
Alseid of Life's Bounty
18%inclusion70 decks392 decks
16%synergy
Overlord of the Mistmoors
17%inclusion66 decks392 decks
15%synergy
Balemurk Leech
16%inclusion64 decks392 decks
16%synergy
Nightmare Shepherd
15%inclusion60 decks392 decks
13%synergy
Spirited Companion
15%inclusion59 decks392 decks
13%synergy
Auramancer
15%inclusion58 decks392 decks
12%synergy
Gremlin Tamer
14%inclusion54 decks392 decks
13%synergy
Solemn Simulacrum
14%inclusion53 decks392 decks
-1%synergy
Fear of Infinity
13%inclusion52 decks392 decks
13%synergy
Nashi, Searcher in the Dark
13%inclusion50 decks392 decks
12%synergy
Summon: Yojimbo
11%inclusion18 decks160 decks
10%synergy
Starnheim Courser
9.4%inclusion37 decks392 decks
6%synergy
Metamorphosis Fanatic
9.4%inclusion37 decks392 decks
5%synergy
Arvinox, the Mind Flail
8.9%inclusion35 decks392 decks
7%synergy
Creeping Peeper
8.4%inclusion33 decks392 decks
8%synergy
Millikin
7.9%inclusion31 decks392 decks
7%synergy
Sun Titan
7.4%inclusion29 decks392 decks
-1%synergy
Fear of Surveillance
7.1%inclusion28 decks392 decks
7%synergy
Enduring Innocence
6.6%inclusion26 decks392 decks
5%synergy
Stenn, Paranoid Partisan
6.6%inclusion26 decks392 decks
5%synergy
Burnished Hart
6.6%inclusion26 decks392 decks
3%synergy
Phenomenon Investigators
6.4%inclusion25 decks392 decks
6%synergy
Summon: Primal Odin
6.3%inclusion10 decks160 decks
2%synergy
Fear of Failed Tests
6.1%inclusion24 decks392 decks
6%synergy
Witch Enchanter
6.1%inclusion24 decks392 decks
-1%synergy
Stitcher's Supplier
6.1%inclusion24 decks392 decks
5%synergy
Appendage Amalgam
6.1%inclusion24 decks392 decks
6%synergy
Fear of the Dark
5.6%inclusion22 decks392 decks
5%synergy
Braids, Arisen Nightmare
5.6%inclusion22 decks392 decks
4%synergy
Ashiok's Reaper
5.6%inclusion22 decks392 decks
5%synergy
Ghostly Keybearer
5.6%inclusion22 decks392 decks
5%synergy
Instants
Arcane Denial
36%inclusion141 decks392 decks
16%synergy
Thirst for Meaning
30%inclusion117 decks392 decks
28%synergy
Path to Exile
27%inclusion106 decks392 decks
-15%synergy
Otherworldly Gaze
24%inclusion93 decks392 decks
22%synergy
Counterspell
23%inclusion92 decks392 decks
-18%synergy
Inkshield
21%inclusion84 decks392 decks
12%synergy
Void Rend
19%inclusion76 decks392 decks
-15%synergy
An Offer You Can't Refuse
17%inclusion67 decks392 decks
-10%synergy
Frantic Search
16%inclusion62 decks392 decks
-2%synergy
Utter End
15%inclusion59 decks392 decks
8%synergy
Negate
15%inclusion57 decks392 decks
-2%synergy
Brainstorm
13%inclusion51 decks392 decks
-4%synergy
Dark Ritual
10%inclusion39 decks392 decks
-9%synergy
Return to Dust
10%inclusion38 decks392 decks
6%synergy
Dovin's Veto
9.2%inclusion36 decks392 decks
-16%synergy
Generous Gift
7.7%inclusion30 decks392 decks
-7%synergy
Fact or Fiction
6.9%inclusion27 decks392 decks
3%synergy
Fell the Profane
6.6%inclusion26 decks392 decks
-2%synergy
Entomb
6.6%inclusion26 decks392 decks
0%synergy
Sink into Stupor
6.4%inclusion25 decks392 decks
-6%synergy
Unwanted Remake
5.9%inclusion23 decks392 decks
5%synergy
Anguished Unmaking
5.9%inclusion23 decks392 decks
-19%synergy
Swan Song
5.9%inclusion23 decks392 decks
-14%synergy
Telling Time
5.4%inclusion21 decks392 decks
3%synergy
Withering Torment
5.4%inclusion21 decks392 decks
4%synergy
Sorceries
Sevinne's Reclamation
31%inclusion123 decks392 decks
22%synergy
Time Wipe
26%inclusion102 decks392 decks
19%synergy
Extinguish All Hope
24%inclusion96 decks392 decks
23%synergy
Dance of the Manse
23%inclusion91 decks392 decks
20%synergy
Windfall
16%inclusion64 decks392 decks
3%synergy
Singularity Rupture
15%inclusion19 decks128 decks
12%synergy
Damn
13%inclusion50 decks392 decks
-8%synergy
Resurgent Belief
13%inclusion49 decks392 decks
10%synergy
Glimpse the Unthinkable
11%inclusion44 decks392 decks
11%synergy
Space-Time Anomaly
11%inclusion14 decks126 decks
9%synergy
Terminus
10%inclusion41 decks392 decks
6%synergy
Reanimate
10%inclusion41 decks392 decks
-6%synergy
Ponder
10%inclusion39 decks392 decks
1%synergy
Read the Bones
8.4%inclusion33 decks392 decks
4%synergy
Brilliant Restoration
8.2%inclusion32 decks392 decks
6%synergy
Toxic Deluge
7.1%inclusion28 decks392 decks
-12%synergy
Austere Command
5.9%inclusion23 decks392 decks
-3%synergy
Diabolic Vision
5.9%inclusion23 decks392 decks
4%synergy
Portent
5.9%inclusion23 decks392 decks
2%synergy
Commune with Evil
5.6%inclusion22 decks392 decks
6%synergy
Aminatou's Augury
5.4%inclusion21 decks392 decks
4%synergy
Open the Vaults
5.4%inclusion21 decks392 decks
4%synergy
Utility Artifacts
Cloud Key
12%inclusion47 decks392 decks
9%synergy
Keys to the House
9.0%inclusion35 decks391 decks
9%synergy
Lightning Greaves
8.7%inclusion34 decks392 decks
-14%synergy
Wayfarer's Bauble
8.7%inclusion34 decks392 decks
1%synergy
Mesmeric Orb
7.7%inclusion30 decks392 decks
7%synergy
Perpetual Timepiece
5.6%inclusion22 decks392 decks
5%synergy
Swiftfoot Boots
5.4%inclusion21 decks392 decks
-19%synergy
Whip of Erebos
5.4%inclusion21 decks392 decks
3%synergy
Enchantments
Seal of Cleansing
41%inclusion160 decks392 decks
39%synergy
Animate Dead
41%inclusion160 decks392 decks
31%synergy
Grasp of Fate
41%inclusion159 decks392 decks
34%synergy
Defiled Crypt // Cadaver Lab
38%inclusion149 decks391 decks
37%synergy
Monologue Tax
38%inclusion149 decks392 decks
32%synergy
Cemetery Tampering
38%inclusion147 decks392 decks
37%synergy
Cacophony Unleashed
35%inclusion137 decks392 decks
33%synergy
Propaganda
33%inclusion130 decks392 decks
6%synergy
Shark Typhoon
33%inclusion129 decks392 decks
27%synergy
Bottomless Pool // Locker Room
31%inclusion123 decks392 decks
29%synergy
Timely Ward
31%inclusion122 decks392 decks
26%synergy
Amphibian Downpour
30%inclusion119 decks392 decks
26%synergy
Estrid's Invocation
30%inclusion119 decks392 decks
26%synergy
Ethereal Armor
29%inclusion112 decks392 decks
24%synergy
Extravagant Replication
29%inclusion112 decks392 decks
24%synergy
Polluted Cistern // Dim Oubliette
28%inclusion108 decks392 decks
27%synergy
Ghostly Prison
27%inclusion105 decks392 decks
5%synergy
Cramped Vents // Access Maze
26%inclusion103 decks392 decks
24%synergy
The Eldest Reborn
26%inclusion103 decks392 decks
24%synergy
All That Glitters
26%inclusion103 decks392 decks
18%synergy
Mystic Remora
26%inclusion101 decks392 decks
5%synergy
Necromancy
25%inclusion99 decks392 decks
21%synergy
Stillness in Motion
25%inclusion47 decks188 decks
25%synergy
The Tale of Tamiyo
24%inclusion93 decks392 decks
23%synergy
Darksteel Mutation
23%inclusion89 decks392 decks
17%synergy
Starfield of Nyx
22%inclusion86 decks392 decks
18%synergy
Mirror Room // Fractured Realm
22%inclusion86 decks392 decks
20%synergy
Restricted Office // Lecture Hall
22%inclusion85 decks392 decks
20%synergy
Central Elevator // Promising Stairs
20%inclusion77 decks392 decks
19%synergy
Imprisoned in the Moon
19%inclusion75 decks392 decks
13%synergy
Seal of Removal
19%inclusion74 decks392 decks
18%synergy
Blind Obedience
19%inclusion73 decks392 decks
6%synergy
One with the Multiverse
18%inclusion71 decks392 decks
13%synergy
Sheltered by Ghosts
18%inclusion71 decks392 decks
16%synergy
Hallowed Haunting
18%inclusion70 decks392 decks
15%synergy
Derelict Attic // Widow's Walk
18%inclusion69 decks390 decks
17%synergy
Dazzling Theater // Prop Room
18%inclusion69 decks391 decks
16%synergy
Secrets of the Dead
18%inclusion69 decks392 decks
17%synergy
Phyrexian Arena
17%inclusion68 decks392 decks
3%synergy
Cast Out
17%inclusion68 decks392 decks
14%synergy
Meat Locker // Drowned Diner
17%inclusion66 decks390 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion60 decks391 decks
15%synergy
Unable to Scream
15%inclusion59 decks392 decks
14%synergy
Spirit-Sister's Call
15%inclusion58 decks392 decks
14%synergy
Copy Enchantment
15%inclusion58 decks392 decks
10%synergy
Nowhere to Run
14%inclusion55 decks392 decks
13%synergy
Surgical Suite // Hospital Room
14%inclusion53 decks392 decks
13%synergy
Funeral Room // Awakening Hall
13%inclusion52 decks392 decks
12%synergy
Teval's Judgment
13%inclusion25 decks191 decks
12%synergy
Court of Cunning
13%inclusion50 decks392 decks
12%synergy
Battles
Invasion of Theros
10%inclusion40 decks392 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
60%inclusion234 decks392 decks
47%synergy
Bojuka Bog
49%inclusion191 decks392 decks
22%synergy
Halimar Depths
20%inclusion80 decks392 decks
16%synergy
Reliquary Tower
10%inclusion40 decks392 decks
-24%synergy
Cephalid Coliseum
8.4%inclusion33 decks392 decks
5%synergy
Takenuma, Abandoned Mire
6.4%inclusion25 decks392 decks
0%synergy
Nephalia Drownyard
5.9%inclusion23 decks392 decks
5%synergy
Otawara, Soaring City
5.6%inclusion22 decks392 decks
-14%synergy
Adagia, Windswept Bastion
5.5%inclusion7 decks128 decks
3%synergy
Mana Artifacts
Arcane Signet
88%inclusion345 decks392 decks
0%synergy
Sol Ring
81%inclusion318 decks392 decks
-9%synergy
Azorius Signet
55%inclusion215 decks392 decks
23%synergy
Orzhov Signet
52%inclusion204 decks392 decks
18%synergy
Talisman of Dominance
42%inclusion163 decks392 decks
-8%synergy
Talisman of Progress
40%inclusion156 decks392 decks
-4%synergy
Talisman of Hierarchy
35%inclusion138 decks392 decks
-8%synergy
Dimir Signet
34%inclusion135 decks392 decks
3%synergy
Mind Stone
25%inclusion97 decks392 decks
12%synergy
Commander's Sphere
24%inclusion96 decks392 decks
6%synergy
Fellwar Stone
24%inclusion95 decks392 decks
-9%synergy
Chromatic Lantern
7.1%inclusion28 decks392 decks
-6%synergy
Lands
Island
99%inclusion387 decks392 decks
6%synergy
Plains
98%inclusion383 decks392 decks
6%synergy
Swamp
97%inclusion380 decks392 decks
6%synergy
Command Tower
94%inclusion367 decks392 decks
1%synergy
Arcane Sanctum
72%inclusion284 decks392 decks
18%synergy
Caves of Koilos
64%inclusion249 decks392 decks
28%synergy
Adarkar Wastes
63%inclusion248 decks392 decks
32%synergy
Underground River
55%inclusion217 decks392 decks
22%synergy
Exotic Orchard
49%inclusion193 decks392 decks
-9%synergy
Obscura Storefront
45%inclusion177 decks392 decks
35%synergy
Terramorphic Expanse
43%inclusion170 decks392 decks
27%synergy
Temple of Enlightenment
43%inclusion169 decks392 decks
27%synergy
Evolving Wilds
43%inclusion169 decks392 decks
18%synergy
Temple of Silence
42%inclusion165 decks392 decks
23%synergy
Temple of Deceit
41%inclusion160 decks392 decks
23%synergy
Azorius Chancery
39%inclusion151 decks392 decks
24%synergy
Dimir Aqueduct
39%inclusion151 decks392 decks
25%synergy
Prairie Stream
38%inclusion148 decks392 decks
-3%synergy
Tainted Field
37%inclusion144 decks392 decks
30%synergy
Glacial Fortress
37%inclusion144 decks392 decks
-4%synergy
Orzhov Basilica
35%inclusion136 decks392 decks
19%synergy
Isolated Chapel
34%inclusion135 decks392 decks
-5%synergy
Contaminated Landscape
34%inclusion134 decks392 decks
20%synergy
Tainted Isle
34%inclusion133 decks392 decks
28%synergy
Sunken Hollow
33%inclusion129 decks392 decks
-7%synergy
Drowned Catacomb
32%inclusion125 decks392 decks
-4%synergy
Valgavoth's Lair
31%inclusion121 decks392 decks
28%synergy
Ash Barrens
28%inclusion108 decks392 decks
17%synergy
Godless Shrine
25%inclusion98 decks392 decks
-26%synergy
Raffine's Tower
25%inclusion97 decks392 decks
-16%synergy
Watery Grave
24%inclusion95 decks392 decks
-26%synergy
Hallowed Fountain
23%inclusion92 decks392 decks
-26%synergy
Flooded Strand
19%inclusion74 decks392 decks
-19%synergy
Sea of Clouds
19%inclusion73 decks392 decks
-17%synergy
Shadowy Backstreet
18%inclusion70 decks392 decks
5%synergy
Undercity Sewers
18%inclusion69 decks392 decks
3%synergy
Meticulous Archive
18%inclusion69 decks392 decks
4%synergy
Polluted Delta
18%inclusion69 decks392 decks
-20%synergy
Floodfarm Verge
17%inclusion68 decks392 decks
6%synergy
Vault of Champions
17%inclusion67 decks392 decks
-16%synergy
Marsh Flats
17%inclusion65 decks392 decks
-20%synergy
Gloomlake Verge
16%inclusion64 decks392 decks
5%synergy
Shipwreck Marsh
15%inclusion60 decks392 decks
-5%synergy
Thriving Isle
15%inclusion59 decks392 decks
11%synergy
Thriving Moor
15%inclusion59 decks392 decks
11%synergy
Skycloud Expanse
15%inclusion58 decks392 decks
0%synergy
Thriving Heath
15%inclusion58 decks392 decks
10%synergy
Deserted Beach
15%inclusion58 decks392 decks
-6%synergy
Morphic Pool
15%inclusion57 decks392 decks
-20%synergy
Darkwater Catacombs
14%inclusion55 decks392 decks
-1%synergy
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