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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Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
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Grave Venerations
14%inclusion1 decks7 decks
14%synergy
Air Nomad Legacy
2.3%inclusion1 decks43 decks
2%synergy
The Spirit Oasis
2.0%inclusion1 decks49 decks
2%synergy
Northern Air Temple
2.0%inclusion1 decks50 decks
2%synergy
Path to Redemption
1.1%inclusion1 decks92 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
77%inclusion286 decks371 decks
70%synergy
Mesa Enchantress
77%inclusion286 decks371 decks
68%synergy
Starfield Mystic
71%inclusion263 decks371 decks
64%synergy
Entity Tracker
66%inclusion245 decks371 decks
60%synergy
Demon of Fate's Design
63%inclusion234 decks371 decks
58%synergy
Doomwake Giant
63%inclusion233 decks371 decks
57%synergy
Ripples of Undeath
54%inclusion202 decks371 decks
52%synergy
Fear of Sleep Paralysis
57%inclusion212 decks371 decks
52%synergy
Gravebreaker Lamia
51%inclusion190 decks371 decks
50%synergy
Scrabbling Skullcrab
51%inclusion190 decks371 decks
50%synergy
Top Cards
Secret Arcade // Dusty Parlor
53%inclusion196 decks371 decks
48%synergy
Sigil of the Empty Throne
52%inclusion193 decks371 decks
46%synergy
Swords to Plowshares
51%inclusion190 decks371 decks
-17%synergy
Ondu Spiritdancer
51%inclusion190 decks371 decks
45%synergy
Mirrormade
50%inclusion187 decks371 decks
41%synergy
Sphere of Safety
50%inclusion184 decks371 decks
40%synergy
Redress Fate
47%inclusion173 decks371 decks
41%synergy
Victor, Valgavoth's Seneschal
46%inclusion170 decks371 decks
44%synergy
Fear of Impostors
42%inclusion154 decks371 decks
40%synergy
Grasp of Fate
41%inclusion153 decks371 decks
35%synergy
Creatures
Soaring Lightbringer
40%inclusion147 decks371 decks
35%synergy
Overlord of the Floodpits
39%inclusion144 decks371 decks
35%synergy
Ghostly Dancers
37%inclusion139 decks371 decks
35%synergy
Overlord of the Balemurk
33%inclusion124 decks371 decks
31%synergy
Aminatou, Veil Piercer
32%inclusion119 decks371 decks
31%synergy
Moon-Blessed Cleric
31%inclusion116 decks371 decks
27%synergy
Heliod, the Radiant Dawn
31%inclusion114 decks371 decks
27%synergy
Zur, Eternal Schemer
29%inclusion109 decks371 decks
26%synergy
Silent Hallcreeper
28%inclusion105 decks371 decks
24%synergy
Enduring Curiosity
28%inclusion105 decks371 decks
21%synergy
Archon of Sun's Grace
28%inclusion104 decks371 decks
23%synergy
Grim Guardian
26%inclusion98 decks371 decks
24%synergy
Athreos, Shroud-Veiled
26%inclusion95 decks371 decks
21%synergy
Skullsnap Nuisance
23%inclusion84 decks371 decks
22%synergy
Archetype of Imagination
22%inclusion82 decks371 decks
17%synergy
Zur the Enchanter
22%inclusion80 decks371 decks
16%synergy
Mindwrack Harpy
21%inclusion79 decks371 decks
21%synergy
Sage of Mysteries
20%inclusion76 decks371 decks
20%synergy
Ancient Cellarspawn
19%inclusion71 decks371 decks
16%synergy
Alseid of Life's Bounty
17%inclusion64 decks371 decks
16%synergy
Balemurk Leech
17%inclusion62 decks371 decks
16%synergy
Overlord of the Mistmoors
16%inclusion59 decks371 decks
14%synergy
Nightmare Shepherd
16%inclusion58 decks371 decks
13%synergy
Spirited Companion
15%inclusion55 decks371 decks
13%synergy
Auramancer
15%inclusion54 decks371 decks
12%synergy
Gremlin Tamer
14%inclusion51 decks371 decks
13%synergy
Fear of Infinity
13%inclusion48 decks371 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion48 decks371 decks
12%synergy
Solemn Simulacrum
13%inclusion48 decks371 decks
-2%synergy
Summon: Yojimbo
12%inclusion16 decks137 decks
11%synergy
Starnheim Courser
9.4%inclusion35 decks371 decks
6%synergy
Metamorphosis Fanatic
9.4%inclusion35 decks371 decks
5%synergy
Arvinox, the Mind Flail
8.6%inclusion32 decks371 decks
7%synergy
Creeping Peeper
8.4%inclusion31 decks371 decks
8%synergy
Millikin
8.1%inclusion30 decks371 decks
7%synergy
Sun Titan
7.5%inclusion28 decks371 decks
-1%synergy
Stenn, Paranoid Partisan
6.7%inclusion25 decks371 decks
5%synergy
Burnished Hart
6.7%inclusion25 decks371 decks
3%synergy
Fear of Surveillance
6.2%inclusion23 decks371 decks
6%synergy
Enduring Innocence
6.2%inclusion23 decks371 decks
5%synergy
Phenomenon Investigators
5.9%inclusion22 decks371 decks
5%synergy
Witch Enchanter
5.9%inclusion22 decks371 decks
-1%synergy
Summon: Primal Odin
5.8%inclusion8 decks137 decks
2%synergy
Stitcher's Supplier
5.7%inclusion21 decks371 decks
5%synergy
Ashiok's Reaper
5.7%inclusion21 decks371 decks
5%synergy
Enduring Tenacity
5.4%inclusion20 decks371 decks
-2%synergy
Appendage Amalgam
5.4%inclusion20 decks371 decks
5%synergy
Ghostly Keybearer
5.4%inclusion20 decks371 decks
5%synergy
Deranged Assistant
5.1%inclusion19 decks371 decks
5%synergy
Fear of Failed Tests
5.1%inclusion19 decks371 decks
5%synergy
Instants
Arcane Denial
36%inclusion135 decks371 decks
16%synergy
Thirst for Meaning
31%inclusion114 decks371 decks
29%synergy
Path to Exile
28%inclusion103 decks371 decks
-14%synergy
Otherworldly Gaze
24%inclusion90 decks371 decks
22%synergy
Counterspell
24%inclusion88 decks371 decks
-18%synergy
Inkshield
22%inclusion81 decks371 decks
13%synergy
Void Rend
20%inclusion74 decks371 decks
-14%synergy
An Offer You Can't Refuse
18%inclusion65 decks371 decks
-9%synergy
Frantic Search
16%inclusion60 decks371 decks
-1%synergy
Negate
15%inclusion57 decks371 decks
-1%synergy
Utter End
15%inclusion55 decks371 decks
8%synergy
Brainstorm
13%inclusion48 decks371 decks
-4%synergy
Return to Dust
10%inclusion37 decks371 decks
6%synergy
Dark Ritual
10%inclusion37 decks371 decks
-9%synergy
Dovin's Veto
10%inclusion36 decks371 decks
-15%synergy
Generous Gift
7.8%inclusion29 decks371 decks
-7%synergy
Fact or Fiction
7.0%inclusion26 decks371 decks
3%synergy
Entomb
6.7%inclusion25 decks371 decks
0%synergy
Fell the Profane
6.5%inclusion24 decks371 decks
-2%synergy
Sink into Stupor
6.5%inclusion24 decks371 decks
-6%synergy
Swan Song
5.9%inclusion22 decks371 decks
-14%synergy
Unwanted Remake
5.9%inclusion22 decks371 decks
5%synergy
Anguished Unmaking
5.9%inclusion22 decks371 decks
-19%synergy
Telling Time
5.4%inclusion20 decks371 decks
3%synergy
Withering Torment
5.4%inclusion20 decks371 decks
4%synergy
Sorceries
Sevinne's Reclamation
31%inclusion115 decks371 decks
22%synergy
Time Wipe
27%inclusion99 decks371 decks
20%synergy
Extinguish All Hope
25%inclusion92 decks371 decks
23%synergy
Dance of the Manse
23%inclusion87 decks371 decks
20%synergy
Windfall
17%inclusion62 decks371 decks
3%synergy
Singularity Rupture
15%inclusion16 decks105 decks
13%synergy
Resurgent Belief
13%inclusion49 decks371 decks
11%synergy
Damn
12%inclusion46 decks371 decks
-8%synergy
Reanimate
11%inclusion41 decks371 decks
-5%synergy
Terminus
11%inclusion39 decks371 decks
6%synergy
Glimpse the Unthinkable
10%inclusion38 decks371 decks
10%synergy
Ponder
10%inclusion38 decks371 decks
1%synergy
Space-Time Anomaly
10%inclusion10 decks103 decks
8%synergy
Read the Bones
8.6%inclusion32 decks371 decks
4%synergy
Brilliant Restoration
8.1%inclusion30 decks371 decks
6%synergy
Toxic Deluge
7.3%inclusion27 decks371 decks
-12%synergy
Austere Command
6.2%inclusion23 decks371 decks
-3%synergy
Diabolic Vision
5.9%inclusion22 decks371 decks
4%synergy
Portent
5.9%inclusion22 decks371 decks
2%synergy
Commune with Evil
5.4%inclusion20 decks371 decks
5%synergy
Open the Vaults
5.4%inclusion20 decks371 decks
4%synergy
Aminatou's Augury
5.1%inclusion19 decks371 decks
4%synergy
Final Vengeance
5.1%inclusion19 decks371 decks
5%synergy
Utility Artifacts
Cloud Key
12%inclusion45 decks371 decks
9%synergy
Wayfarer's Bauble
9.2%inclusion34 decks371 decks
1%synergy
Keys to the House
8.9%inclusion33 decks370 decks
9%synergy
Lightning Greaves
8.6%inclusion32 decks371 decks
-14%synergy
Mesmeric Orb
7.8%inclusion29 decks371 decks
7%synergy
Perpetual Timepiece
5.7%inclusion21 decks371 decks
5%synergy
Whip of Erebos
5.7%inclusion21 decks371 decks
3%synergy
Swiftfoot Boots
5.1%inclusion19 decks371 decks
-19%synergy
Enchantments
Dress Down
41%inclusion153 decks371 decks
39%synergy
Seal of Cleansing
41%inclusion152 decks371 decks
39%synergy
Animate Dead
40%inclusion150 decks371 decks
31%synergy
Cemetery Tampering
38%inclusion142 decks371 decks
38%synergy
Monologue Tax
38%inclusion142 decks371 decks
32%synergy
Defiled Crypt // Cadaver Lab
38%inclusion140 decks370 decks
37%synergy
Cacophony Unleashed
35%inclusion131 decks371 decks
34%synergy
Propaganda
34%inclusion125 decks371 decks
7%synergy
Shark Typhoon
33%inclusion122 decks371 decks
27%synergy
Timely Ward
31%inclusion116 decks371 decks
26%synergy
Estrid's Invocation
31%inclusion115 decks371 decks
26%synergy
Bottomless Pool // Locker Room
31%inclusion115 decks371 decks
29%synergy
Amphibian Downpour
30%inclusion113 decks371 decks
26%synergy
Ethereal Armor
29%inclusion107 decks371 decks
24%synergy
Extravagant Replication
29%inclusion107 decks371 decks
24%synergy
All That Glitters
27%inclusion102 decks371 decks
19%synergy
Ghostly Prison
27%inclusion100 decks371 decks
5%synergy
Polluted Cistern // Dim Oubliette
27%inclusion100 decks371 decks
26%synergy
Mystic Remora
27%inclusion99 decks371 decks
5%synergy
The Eldest Reborn
26%inclusion97 decks371 decks
24%synergy
Stillness in Motion
26%inclusion43 decks167 decks
25%synergy
Cramped Vents // Access Maze
26%inclusion95 decks371 decks
23%synergy
Necromancy
25%inclusion92 decks371 decks
20%synergy
The Tale of Tamiyo
25%inclusion91 decks371 decks
24%synergy
Darksteel Mutation
23%inclusion87 decks371 decks
17%synergy
Starfield of Nyx
22%inclusion80 decks371 decks
17%synergy
Mirror Room // Fractured Realm
22%inclusion80 decks371 decks
19%synergy
Restricted Office // Lecture Hall
21%inclusion79 decks371 decks
19%synergy
Imprisoned in the Moon
19%inclusion72 decks371 decks
13%synergy
Blind Obedience
19%inclusion70 decks371 decks
7%synergy
Central Elevator // Promising Stairs
19%inclusion70 decks371 decks
18%synergy
Secrets of the Dead
19%inclusion69 decks371 decks
18%synergy
Seal of Removal
19%inclusion69 decks371 decks
18%synergy
Sheltered by Ghosts
18%inclusion68 decks371 decks
16%synergy
One with the Multiverse
18%inclusion67 decks371 decks
13%synergy
Hallowed Haunting
18%inclusion67 decks371 decks
16%synergy
Phyrexian Arena
18%inclusion66 decks371 decks
4%synergy
Cast Out
18%inclusion65 decks371 decks
15%synergy
Dazzling Theater // Prop Room
17%inclusion64 decks370 decks
16%synergy
Derelict Attic // Widow's Walk
17%inclusion63 decks369 decks
17%synergy
Meat Locker // Drowned Diner
16%inclusion60 decks369 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion57 decks370 decks
15%synergy
Copy Enchantment
15%inclusion57 decks371 decks
11%synergy
Unable to Scream
15%inclusion56 decks371 decks
14%synergy
Spirit-Sister's Call
15%inclusion55 decks371 decks
14%synergy
Teval's Judgment
14%inclusion23 decks170 decks
13%synergy
Surgical Suite // Hospital Room
13%inclusion50 decks371 decks
13%synergy
Nowhere to Run
13%inclusion49 decks371 decks
12%synergy
Out of the Tombs
13%inclusion48 decks371 decks
12%synergy
Funeral Room // Awakening Hall
13%inclusion48 decks371 decks
12%synergy
Battles
Invasion of Theros
10%inclusion38 decks371 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
60%inclusion222 decks371 decks
47%synergy
Bojuka Bog
49%inclusion182 decks371 decks
22%synergy
Halimar Depths
21%inclusion78 decks371 decks
16%synergy
Reliquary Tower
11%inclusion39 decks371 decks
-23%synergy
Cephalid Coliseum
8.1%inclusion30 decks371 decks
4%synergy
Takenuma, Abandoned Mire
6.2%inclusion23 decks371 decks
0%synergy
Adagia, Windswept Bastion
5.7%inclusion6 decks105 decks
3%synergy
Nephalia Drownyard
5.7%inclusion21 decks371 decks
5%synergy
Otawara, Soaring City
5.7%inclusion21 decks371 decks
-14%synergy
Mana Artifacts
Arcane Signet
88%inclusion327 decks371 decks
0%synergy
Sol Ring
81%inclusion300 decks371 decks
-9%synergy
Azorius Signet
56%inclusion209 decks371 decks
24%synergy
Orzhov Signet
53%inclusion198 decks371 decks
19%synergy
Talisman of Dominance
43%inclusion160 decks371 decks
-6%synergy
Talisman of Progress
40%inclusion150 decks371 decks
-3%synergy
Talisman of Hierarchy
37%inclusion136 decks371 decks
-7%synergy
Dimir Signet
36%inclusion133 decks371 decks
4%synergy
Mind Stone
25%inclusion94 decks371 decks
12%synergy
Fellwar Stone
25%inclusion93 decks371 decks
-9%synergy
Commander's Sphere
25%inclusion92 decks371 decks
6%synergy
Chromatic Lantern
7.5%inclusion28 decks371 decks
-6%synergy
Lands
Island
99%inclusion366 decks371 decks
6%synergy
Plains
98%inclusion362 decks371 decks
6%synergy
Swamp
97%inclusion359 decks371 decks
6%synergy
Command Tower
93%inclusion346 decks371 decks
1%synergy
Arcane Sanctum
73%inclusion270 decks371 decks
18%synergy
Adarkar Wastes
64%inclusion236 decks371 decks
33%synergy
Caves of Koilos
63%inclusion235 decks371 decks
28%synergy
Underground River
56%inclusion207 decks371 decks
23%synergy
Exotic Orchard
49%inclusion180 decks371 decks
-10%synergy
Obscura Storefront
46%inclusion172 decks371 decks
36%synergy
Evolving Wilds
44%inclusion162 decks371 decks
19%synergy
Terramorphic Expanse
44%inclusion162 decks371 decks
27%synergy
Temple of Enlightenment
43%inclusion161 decks371 decks
27%synergy
Temple of Silence
42%inclusion157 decks371 decks
23%synergy
Temple of Deceit
42%inclusion155 decks371 decks
24%synergy
Dimir Aqueduct
40%inclusion147 decks371 decks
26%synergy
Azorius Chancery
39%inclusion145 decks371 decks
25%synergy
Prairie Stream
38%inclusion141 decks371 decks
-3%synergy
Glacial Fortress
37%inclusion137 decks371 decks
-3%synergy
Tainted Field
36%inclusion133 decks371 decks
29%synergy
Orzhov Basilica
35%inclusion131 decks371 decks
19%synergy
Contaminated Landscape
35%inclusion130 decks371 decks
21%synergy
Isolated Chapel
35%inclusion128 decks371 decks
-4%synergy
Tainted Isle
34%inclusion126 decks371 decks
28%synergy
Sunken Hollow
33%inclusion123 decks371 decks
-6%synergy
Drowned Catacomb
32%inclusion118 decks371 decks
-4%synergy
Valgavoth's Lair
32%inclusion117 decks371 decks
29%synergy
Ash Barrens
28%inclusion105 decks371 decks
18%synergy
Godless Shrine
24%inclusion90 decks371 decks
-26%synergy
Raffine's Tower
24%inclusion88 decks371 decks
-17%synergy
Watery Grave
23%inclusion85 decks371 decks
-27%synergy
Hallowed Fountain
22%inclusion81 decks371 decks
-27%synergy
Flooded Strand
19%inclusion71 decks371 decks
-19%synergy
Shadowy Backstreet
18%inclusion68 decks371 decks
6%synergy
Meticulous Archive
18%inclusion68 decks371 decks
5%synergy
Sea of Clouds
18%inclusion68 decks371 decks
-17%synergy
Undercity Sewers
18%inclusion66 decks371 decks
4%synergy
Polluted Delta
18%inclusion66 decks371 decks
-20%synergy
Floodfarm Verge
17%inclusion63 decks371 decks
6%synergy
Vault of Champions
17%inclusion62 decks371 decks
-16%synergy
Marsh Flats
16%inclusion61 decks371 decks
-20%synergy
Gloomlake Verge
16%inclusion59 decks371 decks
5%synergy
Thriving Isle
16%inclusion58 decks371 decks
11%synergy
Thriving Moor
15%inclusion57 decks371 decks
11%synergy
Thriving Heath
15%inclusion56 decks371 decks
11%synergy
Shipwreck Marsh
15%inclusion55 decks371 decks
-6%synergy
Skycloud Expanse
14%inclusion53 decks371 decks
-1%synergy
Morphic Pool
14%inclusion53 decks371 decks
-20%synergy
Deserted Beach
14%inclusion51 decks371 decks
-7%synergy
Darkwater Catacombs
13%inclusion50 decks371 decks
-1%synergy
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