The Master of Keys (Commander) - Core Control

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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Mana Artifacts
Lands
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Bender's Waterskin
14%inclusion1 decks7 decks
11%synergy
High Synergy Cards
Seal of Cleansing
89%inclusion8 decks9 decks
87%synergy
Ripples of Undeath
78%inclusion7 decks9 decks
75%synergy
Fear of Sleep Paralysis
78%inclusion7 decks9 decks
72%synergy
Mesa Enchantress
78%inclusion7 decks9 decks
69%synergy
Gravebreaker Lamia
67%inclusion6 decks9 decks
66%synergy
Entity Tracker
67%inclusion6 decks9 decks
60%synergy
Stillness in Motion
57%inclusion4 decks7 decks
57%synergy
Sage of Mysteries
56%inclusion5 decks9 decks
55%synergy
Seal of Removal
56%inclusion5 decks9 decks
55%synergy
Singularity Rupture
57%inclusion4 decks7 decks
55%synergy
Top Cards
Propaganda
67%inclusion6 decks9 decks
40%synergy
Scrabbling Skullcrab
56%inclusion5 decks9 decks
55%synergy
Sevinne's Reclamation
56%inclusion5 decks9 decks
47%synergy
Starfield Mystic
56%inclusion5 decks9 decks
49%synergy
Inquisitive Glimmer
56%inclusion5 decks9 decks
48%synergy
Amphibian Downpour
56%inclusion5 decks9 decks
51%synergy
Doomwake Giant
56%inclusion5 decks9 decks
50%synergy
Animate Dead
56%inclusion5 decks9 decks
46%synergy
Ghostly Prison
56%inclusion5 decks9 decks
34%synergy
Grasp of Fate
44%inclusion4 decks9 decks
38%synergy
Game Changers
Thassa's Oracle
11%inclusion1 decks9 decks
1%synergy
Creatures
Demon of Fate's Design
44%inclusion4 decks9 decks
39%synergy
Fear of Impostors
44%inclusion4 decks9 decks
43%synergy
Archon of Sun's Grace
33%inclusion3 decks9 decks
29%synergy
Overlord of the Balemurk
33%inclusion3 decks9 decks
31%synergy
Victor, Valgavoth's Seneschal
33%inclusion3 decks9 decks
31%synergy
Ancient Cellarspawn
33%inclusion3 decks9 decks
30%synergy
Grim Guardian
33%inclusion3 decks9 decks
31%synergy
Heliod, the Radiant Dawn
33%inclusion3 decks9 decks
29%synergy
Zur, Eternal Schemer
33%inclusion3 decks9 decks
30%synergy
Ondu Spiritdancer
33%inclusion3 decks9 decks
27%synergy
Alseid of Life's Bounty
33%inclusion3 decks9 decks
32%synergy
Zur the Enchanter
33%inclusion3 decks9 decks
28%synergy
Mindwrack Harpy
33%inclusion3 decks9 decks
33%synergy
Witch Enchanter
22%inclusion2 decks9 decks
15%synergy
Overlord of the Floodpits
22%inclusion2 decks9 decks
18%synergy
Overlord of the Mistmoors
22%inclusion2 decks9 decks
20%synergy
Athreos, Shroud-Veiled
22%inclusion2 decks9 decks
18%synergy
Nashi, Searcher in the Dark
22%inclusion2 decks9 decks
22%synergy
Aminatou, Veil Piercer
22%inclusion2 decks9 decks
21%synergy
Valgavoth, Terror Eater
22%inclusion2 decks9 decks
19%synergy
Summon: Yojimbo
14%inclusion1 decks7 decks
13%synergy
Phenax, God of Deception
11%inclusion1 decks9 decks
11%synergy
Sludge Monster
11%inclusion1 decks9 decks
11%synergy
Kor Spiritdancer
11%inclusion1 decks9 decks
9%synergy
Dorothea, Vengeful Victim
11%inclusion1 decks9 decks
11%synergy
The Mindskinner
11%inclusion1 decks9 decks
10%synergy
Fear of Failed Tests
11%inclusion1 decks9 decks
11%synergy
Ertai, the Corrupted
11%inclusion1 decks9 decks
11%synergy
Archon of Falling Stars
11%inclusion1 decks9 decks
11%synergy
Lurrus of the Dream-Den
11%inclusion1 decks9 decks
9%synergy
Agent of Erebos
11%inclusion1 decks9 decks
11%synergy
Champions of Minas Tirith
11%inclusion1 decks9 decks
11%synergy
Faramir, Steward of Gondor
11%inclusion1 decks9 decks
11%synergy
Valley Floodcaller
11%inclusion1 decks9 decks
7%synergy
Dream Eater
11%inclusion1 decks9 decks
11%synergy
Faceless Butcher
11%inclusion1 decks9 decks
11%synergy
Fear of Surveillance
11%inclusion1 decks9 decks
11%synergy
Tireless Tribe
11%inclusion1 decks9 decks
9%synergy
Horrid Shadowspinner
11%inclusion1 decks9 decks
11%synergy
Archon of Coronation
11%inclusion1 decks9 decks
11%synergy
Soaring Lightbringer
11%inclusion1 decks9 decks
6%synergy
Silent Hallcreeper
11%inclusion1 decks9 decks
7%synergy
Ashiok's Reaper
11%inclusion1 decks9 decks
11%synergy
Hedron Crab
11%inclusion1 decks9 decks
11%synergy
Boggart Trawler
11%inclusion1 decks9 decks
8%synergy
Barrowgoyf
11%inclusion1 decks9 decks
11%synergy
Dusk Mangler
11%inclusion1 decks9 decks
11%synergy
Ravenous Chupacabra
11%inclusion1 decks9 decks
10%synergy
Sram, Senior Edificer
11%inclusion1 decks9 decks
6%synergy
Moon-Blessed Cleric
11%inclusion1 decks9 decks
6%synergy
Instants
Otherworldly Gaze
33%inclusion3 decks9 decks
31%synergy
Frantic Search
22%inclusion2 decks9 decks
5%synergy
Negate
22%inclusion2 decks9 decks
6%synergy
Dawn's Truce
22%inclusion2 decks9 decks
18%synergy
Thirst for Meaning
22%inclusion2 decks9 decks
21%synergy
Arcane Denial
22%inclusion2 decks9 decks
2%synergy
Swords to Plowshares
22%inclusion2 decks9 decks
-46%synergy
Sejiri Shelter
22%inclusion2 decks9 decks
21%synergy
Path to Exile
22%inclusion2 decks9 decks
-20%synergy
Inkshield
22%inclusion2 decks9 decks
13%synergy
Fell the Profane
11%inclusion1 decks9 decks
2%synergy
Dovin's Veto
11%inclusion1 decks9 decks
-14%synergy
An Offer You Can't Refuse
11%inclusion1 decks9 decks
-15%synergy
Return to Dust
11%inclusion1 decks9 decks
7%synergy
Parting Gust
11%inclusion1 decks9 decks
11%synergy
Brainstorm
11%inclusion1 decks9 decks
-6%synergy
Render Silent
11%inclusion1 decks9 decks
7%synergy
Mindbreak Trap
11%inclusion1 decks9 decks
4%synergy
Dark Ritual
11%inclusion1 decks9 decks
-8%synergy
Darkblast
11%inclusion1 decks9 decks
11%synergy
Void Rend
11%inclusion1 decks9 decks
-22%synergy
Read the Runes
11%inclusion1 decks9 decks
11%synergy
Curate
11%inclusion1 decks9 decks
11%synergy
Slip Out the Back
11%inclusion1 decks9 decks
10%synergy
Obscura Charm
11%inclusion1 decks9 decks
8%synergy
Disallow
11%inclusion1 decks9 decks
8%synergy
Snap
11%inclusion1 decks9 decks
9%synergy
Sink into Stupor
11%inclusion1 decks9 decks
-1%synergy
Utter End
11%inclusion1 decks9 decks
4%synergy
Borne Upon a Wind
11%inclusion1 decks9 decks
6%synergy
March of Swirling Mist
11%inclusion1 decks9 decks
10%synergy
Don't Make a Sound
11%inclusion1 decks9 decks
11%synergy
Sorceries
Redress Fate
33%inclusion3 decks9 decks
27%synergy
Time Wipe
22%inclusion2 decks9 decks
15%synergy
Extinguish All Hope
22%inclusion2 decks9 decks
21%synergy
Dance of the Manse
22%inclusion2 decks9 decks
19%synergy
Space-Time Anomaly
14%inclusion1 decks7 decks
13%synergy
Ponder
11%inclusion1 decks9 decks
2%synergy
Lively Dirge
11%inclusion1 decks9 decks
10%synergy
Unmarked Grave
11%inclusion1 decks9 decks
10%synergy
Ondu Inversion
11%inclusion1 decks9 decks
10%synergy
Open the Vaults
11%inclusion1 decks9 decks
10%synergy
Unearth
11%inclusion1 decks9 decks
9%synergy
Replenish
11%inclusion1 decks9 decks
9%synergy
Curse of the Swine
11%inclusion1 decks9 decks
11%synergy
Read the Bones
11%inclusion1 decks9 decks
7%synergy
Rite of Oblivion
11%inclusion1 decks9 decks
10%synergy
Living Death
11%inclusion1 decks9 decks
7%synergy
Preordain
11%inclusion1 decks9 decks
6%synergy
Cleansing Nova
11%inclusion1 decks9 decks
7%synergy
Damn
11%inclusion1 decks9 decks
-9%synergy
Retether
11%inclusion1 decks9 decks
10%synergy
Feast of Succession
11%inclusion1 decks9 decks
11%synergy
Breakthrough
11%inclusion1 decks9 decks
11%synergy
Final Vengeance
11%inclusion1 decks9 decks
11%synergy
Unburial Rites
11%inclusion1 decks9 decks
8%synergy
Portent
11%inclusion1 decks9 decks
8%synergy
Notion Rain
11%inclusion1 decks9 decks
11%synergy
Utility Artifacts
Perpetual Timepiece
11%inclusion1 decks9 decks
11%synergy
Wayfarer's Bauble
11%inclusion1 decks9 decks
3%synergy
Claws of Gix
11%inclusion1 decks9 decks
11%synergy
Altar of Dementia
11%inclusion1 decks9 decks
10%synergy
Bident of Thassa
11%inclusion1 decks9 decks
2%synergy
Enchantments
Imprisoned in the Moon
44%inclusion4 decks9 decks
38%synergy
Seal of Doom
44%inclusion4 decks9 decks
44%synergy
Mirrormade
44%inclusion4 decks9 decks
35%synergy
Starfield of Nyx
44%inclusion4 decks9 decks
40%synergy
Dress Down
44%inclusion4 decks9 decks
42%synergy
Teval's Judgment
43%inclusion3 decks7 decks
42%synergy
Cacophony Unleashed
33%inclusion3 decks9 decks
32%synergy
Unable to Scream
33%inclusion3 decks9 decks
32%synergy
Utter Insignificance
33%inclusion3 decks9 decks
33%synergy
Blind Obedience
33%inclusion3 decks9 decks
21%synergy
Necromancy
33%inclusion3 decks9 decks
29%synergy
Estrid's Invocation
33%inclusion3 decks9 decks
29%synergy
Mystic Remora
33%inclusion3 decks9 decks
12%synergy
Sphere of Safety
33%inclusion3 decks9 decks
24%synergy
Monologue Tax
33%inclusion3 decks9 decks
27%synergy
Painful Quandary
33%inclusion3 decks9 decks
31%synergy
Search for Azcanta
33%inclusion3 decks9 decks
32%synergy
Detention Sphere
22%inclusion2 decks9 decks
21%synergy
Court of Cunning
22%inclusion2 decks9 decks
21%synergy
Frozen Aether
22%inclusion2 decks9 decks
22%synergy
Aqueous Form
22%inclusion2 decks9 decks
19%synergy
Lost in the Maze
22%inclusion2 decks9 decks
22%synergy
Sigil of the Empty Throne
22%inclusion2 decks9 decks
16%synergy
Shardmage's Rescue
22%inclusion2 decks9 decks
22%synergy
Flooded Woodlands
22%inclusion2 decks9 decks
22%synergy
Chronic Flooding
22%inclusion2 decks9 decks
22%synergy
Leyline of Sanctity
22%inclusion2 decks9 decks
22%synergy
Soul Snare
22%inclusion2 decks9 decks
22%synergy
Duelist's Heritage
22%inclusion2 decks9 decks
20%synergy
Boon of the Spirit Realm
22%inclusion2 decks9 decks
21%synergy
Birth of the Imperium
22%inclusion2 decks9 decks
20%synergy
Spirit-Sister's Call
22%inclusion2 decks9 decks
21%synergy
The Tale of Tamiyo
22%inclusion2 decks9 decks
22%synergy
Leyline of Anticipation
22%inclusion2 decks9 decks
18%synergy
Karmic Justice
22%inclusion2 decks9 decks
20%synergy
All That Glitters
22%inclusion2 decks9 decks
13%synergy
Curator's Ward
22%inclusion2 decks9 decks
19%synergy
Static Prison
22%inclusion2 decks9 decks
22%synergy
Secrets of the Dead
22%inclusion2 decks9 decks
22%synergy
Bottomless Pool // Locker Room
22%inclusion2 decks9 decks
20%synergy
Eaten by Piranhas
22%inclusion2 decks9 decks
21%synergy
Secret Arcade // Dusty Parlor
22%inclusion2 decks9 decks
17%synergy
Solitary Confinement
22%inclusion2 decks9 decks
20%synergy
Nowhere to Run
22%inclusion2 decks9 decks
21%synergy
Ethereal Armor
22%inclusion2 decks9 decks
18%synergy
Hallowed Haunting
22%inclusion2 decks9 decks
20%synergy
Marchesa's Decree
22%inclusion2 decks9 decks
22%synergy
Phyrexian Arena
22%inclusion2 decks9 decks
8%synergy
Banishing Light
22%inclusion2 decks9 decks
21%synergy
Combat Research
22%inclusion2 decks9 decks
19%synergy
Battles
Invasion of Theros
22%inclusion2 decks9 decks
20%synergy
Planeswalkers
Ashiok, Dream Render
11%inclusion1 decks9 decks
9%synergy
Ashiok, Nightmare Muse
11%inclusion1 decks9 decks
11%synergy
Utility Lands
Bojuka Bog
44%inclusion4 decks9 decks
17%synergy
Hall of Heliod's Generosity
33%inclusion3 decks9 decks
20%synergy
Cephalid Coliseum
22%inclusion2 decks9 decks
19%synergy
Rogue's Passage
22%inclusion2 decks9 decks
13%synergy
Creeping Tar Pit
11%inclusion1 decks9 decks
10%synergy
Arcane Lighthouse
11%inclusion1 decks9 decks
10%synergy
Buried Ruin
11%inclusion1 decks9 decks
8%synergy
Shambling Vent
11%inclusion1 decks9 decks
10%synergy
War Room
11%inclusion1 decks9 decks
11%synergy
Emergence Zone
11%inclusion1 decks9 decks
9%synergy
Restless Anchorage
11%inclusion1 decks9 decks
10%synergy
Throne of the High City
11%inclusion1 decks9 decks
11%synergy
Takenuma, Abandoned Mire
11%inclusion1 decks9 decks
5%synergy
Drownyard Temple
11%inclusion1 decks9 decks
11%synergy
Mana Artifacts
Talisman of Hierarchy
89%inclusion8 decks9 decks
46%synergy
Talisman of Progress
78%inclusion7 decks9 decks
35%synergy
Arcane Signet
78%inclusion7 decks9 decks
-10%synergy
Talisman of Dominance
67%inclusion6 decks9 decks
18%synergy
Sol Ring
67%inclusion6 decks9 decks
-23%synergy
Azorius Signet
44%inclusion4 decks9 decks
12%synergy
Dimir Signet
22%inclusion2 decks9 decks
-10%synergy
Fellwar Stone
22%inclusion2 decks9 decks
-12%synergy
Commander's Sphere
11%inclusion1 decks9 decks
-8%synergy
Chromatic Lantern
11%inclusion1 decks9 decks
-2%synergy
Coveted Jewel
11%inclusion1 decks9 decks
10%synergy
Mind Stone
11%inclusion1 decks9 decks
-2%synergy
Orzhov Signet
11%inclusion1 decks9 decks
-23%synergy
Lands
Caves of Koilos
100%inclusion9 decks9 decks
65%synergy
Swamp
100%inclusion9 decks9 decks
9%synergy
Island
100%inclusion9 decks9 decks
7%synergy
Plains
100%inclusion9 decks9 decks
9%synergy
Command Tower
89%inclusion8 decks9 decks
-4%synergy
Contaminated Landscape
89%inclusion8 decks9 decks
74%synergy
Arcane Sanctum
89%inclusion8 decks9 decks
34%synergy
Adarkar Wastes
89%inclusion8 decks9 decks
58%synergy
Valgavoth's Lair
78%inclusion7 decks9 decks
75%synergy
Underground River
78%inclusion7 decks9 decks
45%synergy
Glacial Fortress
67%inclusion6 decks9 decks
27%synergy
Exotic Orchard
67%inclusion6 decks9 decks
8%synergy
Isolated Chapel
67%inclusion6 decks9 decks
28%synergy
Prairie Stream
56%inclusion5 decks9 decks
15%synergy
Drowned Catacomb
56%inclusion5 decks9 decks
20%synergy
Sunken Hollow
56%inclusion5 decks9 decks
16%synergy
Temple of Silence
56%inclusion5 decks9 decks
36%synergy
Azorius Chancery
44%inclusion4 decks9 decks
30%synergy
Ash Barrens
44%inclusion4 decks9 decks
34%synergy
Evolving Wilds
44%inclusion4 decks9 decks
19%synergy
Obscura Storefront
44%inclusion4 decks9 decks
34%synergy
Tainted Isle
33%inclusion3 decks9 decks
27%synergy
Terramorphic Expanse
33%inclusion3 decks9 decks
16%synergy
Temple of Deceit
33%inclusion3 decks9 decks
15%synergy
Dimir Aqueduct
33%inclusion3 decks9 decks
19%synergy
Tainted Field
33%inclusion3 decks9 decks
26%synergy
Port Town
33%inclusion3 decks9 decks
16%synergy
Skycloud Expanse
33%inclusion3 decks9 decks
19%synergy
Temple of Enlightenment
33%inclusion3 decks9 decks
16%synergy
Path of Ancestry
33%inclusion3 decks9 decks
6%synergy
Choked Estuary
33%inclusion3 decks9 decks
17%synergy
Watery Grave
33%inclusion3 decks9 decks
-16%synergy
Witch Enchanter
22%inclusion2 decks9 decks
15%synergy
Sea of Clouds
22%inclusion2 decks9 decks
-14%synergy
Raffine's Tower
22%inclusion2 decks9 decks
-19%synergy
Godless Shrine
22%inclusion2 decks9 decks
-28%synergy
Orzhov Basilica
22%inclusion2 decks9 decks
6%synergy
Shineshadow Snarl
22%inclusion2 decks9 decks
12%synergy
Sejiri Shelter
22%inclusion2 decks9 decks
21%synergy
Deserted Beach
22%inclusion2 decks9 decks
1%synergy
Fell the Profane
11%inclusion1 decks9 decks
2%synergy
Gemstone Mine
11%inclusion1 decks9 decks
11%synergy
Ondu Inversion
11%inclusion1 decks9 decks
10%synergy
Fetid Pools
11%inclusion1 decks9 decks
4%synergy
Irrigated Farmland
11%inclusion1 decks9 decks
4%synergy
Darkwater Catacombs
11%inclusion1 decks9 decks
-3%synergy
Shipwreck Marsh
11%inclusion1 decks9 decks
-10%synergy
Esper Panorama
11%inclusion1 decks9 decks
7%synergy
Boggart Trawler
11%inclusion1 decks9 decks
8%synergy
Sink into Stupor
11%inclusion1 decks9 decks
-1%synergy
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