The Master of Keys (Commander) - Rooms

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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Benevolent River Spirit
8.3%inclusion1 decks12 decks
8%synergy
Dutiful Knowledge Seeker
8.3%inclusion1 decks12 decks
8%synergy
Koh, the Face Stealer
8.3%inclusion1 decks12 decks
8%synergy
Wan Shi Tong, Librarian
7.7%inclusion1 decks13 decks
3%synergy
Airbender Ascension
7.7%inclusion1 decks13 decks
7%synergy
High Synergy Cards
Inquisitive Glimmer
97%inclusion31 decks32 decks
89%synergy
Central Elevator // Promising Stairs
88%inclusion28 decks32 decks
87%synergy
Entity Tracker
88%inclusion28 decks32 decks
81%synergy
Defiled Crypt // Cadaver Lab
81%inclusion26 decks32 decks
80%synergy
Fear of Sleep Paralysis
84%inclusion27 decks32 decks
79%synergy
Secret Arcade // Dusty Parlor
78%inclusion25 decks32 decks
73%synergy
Restricted Office // Lecture Hall
75%inclusion24 decks32 decks
73%synergy
Dazzling Theater // Prop Room
72%inclusion23 decks32 decks
70%synergy
Polluted Cistern // Dim Oubliette
69%inclusion22 decks32 decks
68%synergy
Victor, Valgavoth's Seneschal
66%inclusion21 decks32 decks
64%synergy
Top Cards
Mesa Enchantress
69%inclusion22 decks32 decks
60%synergy
Mirror Room // Fractured Realm
66%inclusion21 decks32 decks
63%synergy
Overlord of the Floodpits
66%inclusion21 decks32 decks
62%synergy
Ghostly Dancers
66%inclusion21 decks32 decks
63%synergy
Ripples of Undeath
63%inclusion20 decks32 decks
60%synergy
Bottomless Pool // Locker Room
63%inclusion20 decks32 decks
60%synergy
Cramped Vents // Access Maze
63%inclusion20 decks32 decks
60%synergy
Enduring Curiosity
63%inclusion20 decks32 decks
55%synergy
Demon of Fate's Design
59%inclusion19 decks32 decks
54%synergy
Starfield Mystic
59%inclusion19 decks32 decks
53%synergy
Game Changers
Smothering Tithe
28%inclusion9 decks32 decks
-4%synergy
Rhystic Study
19%inclusion6 decks32 decks
-14%synergy
Enlightened Tutor
13%inclusion4 decks32 decks
-8%synergy
Vampiric Tutor
9.4%inclusion3 decks32 decks
-8%synergy
Cyclonic Rift
9.4%inclusion3 decks32 decks
-15%synergy
Demonic Tutor
6.3%inclusion2 decks32 decks
-15%synergy
Creatures
Doomwake Giant
59%inclusion19 decks32 decks
53%synergy
Scrabbling Skullcrab
56%inclusion18 decks32 decks
55%synergy
Overlord of the Balemurk
53%inclusion17 decks32 decks
51%synergy
Gravebreaker Lamia
53%inclusion17 decks32 decks
52%synergy
Silent Hallcreeper
50%inclusion16 decks32 decks
46%synergy
Fear of Impostors
47%inclusion15 decks32 decks
45%synergy
Soaring Lightbringer
44%inclusion14 decks32 decks
39%synergy
Overlord of the Mistmoors
44%inclusion14 decks32 decks
42%synergy
Zur, Eternal Schemer
41%inclusion13 decks32 decks
37%synergy
Ondu Spiritdancer
38%inclusion12 decks32 decks
31%synergy
Moon-Blessed Cleric
38%inclusion12 decks32 decks
33%synergy
Ancient Cellarspawn
31%inclusion10 decks32 decks
28%synergy
Grim Guardian
31%inclusion10 decks32 decks
29%synergy
Heliod, the Radiant Dawn
28%inclusion9 decks32 decks
24%synergy
Zur the Enchanter
28%inclusion9 decks32 decks
23%synergy
Fear of Infinity
25%inclusion8 decks32 decks
24%synergy
Skullsnap Nuisance
25%inclusion8 decks32 decks
25%synergy
Gremlin Tamer
25%inclusion8 decks32 decks
24%synergy
Balemurk Leech
25%inclusion8 decks32 decks
24%synergy
Aminatou, Veil Piercer
25%inclusion8 decks32 decks
24%synergy
Ghostly Keybearer
25%inclusion8 decks32 decks
25%synergy
Archetype of Imagination
22%inclusion7 decks32 decks
17%synergy
Emet-Selch of the Third Seat
20%inclusion4 decks20 decks
10%synergy
Archon of Sun's Grace
19%inclusion6 decks32 decks
14%synergy
Mindwrack Harpy
19%inclusion6 decks32 decks
18%synergy
Athreos, Shroud-Veiled
16%inclusion5 decks32 decks
11%synergy
Sage of Mysteries
16%inclusion5 decks32 decks
15%synergy
Creeping Peeper
16%inclusion5 decks32 decks
15%synergy
Fear of Surveillance
13%inclusion4 decks32 decks
12%synergy
Fear of the Dark
13%inclusion4 decks32 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion4 decks32 decks
12%synergy
Solemn Simulacrum
13%inclusion4 decks32 decks
-3%synergy
Optimistic Scavenger
13%inclusion4 decks32 decks
12%synergy
Witch Enchanter
13%inclusion4 decks32 decks
6%synergy
Spirited Companion
13%inclusion4 decks32 decks
11%synergy
Nightmare Shepherd
13%inclusion4 decks32 decks
10%synergy
Alseid of Life's Bounty
13%inclusion4 decks32 decks
11%synergy
Callaphe, Beloved of the Sea
13%inclusion4 decks32 decks
11%synergy
The Mindskinner
9.4%inclusion3 decks32 decks
9%synergy
Valgavoth, Terror Eater
9.4%inclusion3 decks32 decks
6%synergy
Unwilling Vessel
9.4%inclusion3 decks32 decks
9%synergy
Millikin
9.4%inclusion3 decks32 decks
9%synergy
Fear of Failed Tests
9.4%inclusion3 decks32 decks
9%synergy
Agent of Erebos
9.4%inclusion3 decks32 decks
9%synergy
Auramancer
9.4%inclusion3 decks32 decks
6%synergy
Wan Shi Tong, All-Knowing
7.7%inclusion1 decks13 decks
8%synergy
Dreadwing Scavenger
6.9%inclusion2 decks29 decks
6%synergy
Phenax, God of Deception
6.3%inclusion2 decks32 decks
6%synergy
Lord of the Forsaken
6.3%inclusion2 decks32 decks
6%synergy
Hanna, Ship's Navigator
6.3%inclusion2 decks32 decks
4%synergy
Instants
Swords to Plowshares
38%inclusion12 decks32 decks
-31%synergy
Path to Exile
38%inclusion12 decks32 decks
-4%synergy
Void Rend
28%inclusion9 decks32 decks
-5%synergy
Counterspell
25%inclusion8 decks32 decks
-16%synergy
Arcane Denial
25%inclusion8 decks32 decks
5%synergy
Thirst for Meaning
19%inclusion6 decks32 decks
17%synergy
Frantic Search
19%inclusion6 decks32 decks
2%synergy
An Offer You Can't Refuse
16%inclusion5 decks32 decks
-11%synergy
Get Out
16%inclusion5 decks32 decks
15%synergy
Faithful Mending
13%inclusion4 decks32 decks
9%synergy
Sink into Stupor
13%inclusion4 decks32 decks
0%synergy
Inkshield
13%inclusion4 decks32 decks
3%synergy
Dovin's Veto
9.4%inclusion3 decks32 decks
-16%synergy
Dark Ritual
9.4%inclusion3 decks32 decks
-10%synergy
Utter End
9.4%inclusion3 decks32 decks
2%synergy
Waterlogged Teachings
9.4%inclusion3 decks32 decks
5%synergy
Fell the Profane
9.4%inclusion3 decks32 decks
1%synergy
Return to Dust
6.3%inclusion2 decks32 decks
3%synergy
Brainstorm
6.3%inclusion2 decks32 decks
-11%synergy
Fact or Fiction
6.3%inclusion2 decks32 decks
2%synergy
Twist Reality
6.3%inclusion2 decks32 decks
6%synergy
Mana Drain
6.3%inclusion2 decks32 decks
-11%synergy
Otherworldly Gaze
6.3%inclusion2 decks32 decks
4%synergy
Don't Make a Sound
6.3%inclusion2 decks32 decks
6%synergy
Withering Torment
6.3%inclusion2 decks32 decks
5%synergy
Flusterstorm
6.3%inclusion2 decks32 decks
-2%synergy
Long River's Pull
6.3%inclusion2 decks32 decks
5%synergy
Sokka's Haiku
5.6%inclusion1 decks18 decks
6%synergy
Sorceries
Redress Fate
41%inclusion13 decks32 decks
34%synergy
Extinguish All Hope
31%inclusion10 decks32 decks
30%synergy
Dance of the Manse
22%inclusion7 decks32 decks
18%synergy
Time Wipe
19%inclusion6 decks32 decks
12%synergy
Singularity Rupture
17%inclusion3 decks18 decks
14%synergy
Resurgent Belief
16%inclusion5 decks32 decks
13%synergy
Sevinne's Reclamation
16%inclusion5 decks32 decks
7%synergy
Demonic Counsel
13%inclusion4 decks32 decks
11%synergy
Windfall
9.4%inclusion3 decks32 decks
-4%synergy
Reanimate
9.4%inclusion3 decks32 decks
-7%synergy
Diresight
9.4%inclusion3 decks32 decks
9%synergy
Blasphemous Edict
6.7%inclusion2 decks30 decks
4%synergy
Supreme Verdict
6.3%inclusion2 decks32 decks
-9%synergy
Open the Vaults
6.3%inclusion2 decks32 decks
5%synergy
Plea for Guidance
6.3%inclusion2 decks32 decks
6%synergy
Idyllic Tutor
6.3%inclusion2 decks32 decks
2%synergy
Toxic Deluge
6.3%inclusion2 decks32 decks
-13%synergy
Breach the Multiverse
6.3%inclusion2 decks32 decks
4%synergy
Ponder
6.3%inclusion2 decks32 decks
-3%synergy
Commune with Evil
6.3%inclusion2 decks32 decks
6%synergy
Starfall Invocation
6.3%inclusion2 decks32 decks
4%synergy
Damn
6.3%inclusion2 decks32 decks
-14%synergy
Utility Artifacts
Keys to the House
44%inclusion14 decks32 decks
44%synergy
Cloud Key
19%inclusion6 decks32 decks
15%synergy
Mesmeric Orb
9.4%inclusion3 decks32 decks
8%synergy
Wayfarer's Bauble
9.4%inclusion3 decks32 decks
1%synergy
Lightning Greaves
9.4%inclusion3 decks32 decks
-13%synergy
Perpetual Timepiece
6.3%inclusion2 decks32 decks
6%synergy
Skeleton Key
6.3%inclusion2 decks32 decks
6%synergy
Mystery Key
6.3%inclusion2 decks32 decks
6%synergy
The Key to the Vault
6.3%inclusion2 decks32 decks
4%synergy
Key to the City
6.3%inclusion2 decks32 decks
5%synergy
Swiftfoot Boots
6.3%inclusion2 decks32 decks
-18%synergy
Bident of Thassa
6.3%inclusion2 decks32 decks
-3%synergy
Whip of Erebos
6.3%inclusion2 decks32 decks
4%synergy
Codex Shredder
6.3%inclusion2 decks32 decks
6%synergy
Rescue Skiff
5.6%inclusion1 decks18 decks
5%synergy
The Water Crystal
5.0%inclusion1 decks20 decks
3%synergy
Enchantments
Sphere of Safety
53%inclusion17 decks32 decks
44%synergy
Sigil of the Empty Throne
50%inclusion16 decks32 decks
44%synergy
Meat Locker // Drowned Diner
50%inclusion16 decks32 decks
49%synergy
Derelict Attic // Widow's Walk
50%inclusion16 decks32 decks
50%synergy
Funeral Room // Awakening Hall
50%inclusion16 decks32 decks
49%synergy
Underwater Tunnel // Slimy Aquarium
47%inclusion15 decks32 decks
47%synergy
Propaganda
47%inclusion15 decks32 decks
20%synergy
Surgical Suite // Hospital Room
41%inclusion13 decks32 decks
40%synergy
Ghostly Prison
41%inclusion13 decks32 decks
19%synergy
Animate Dead
38%inclusion12 decks32 decks
28%synergy
Mirrormade
34%inclusion11 decks32 decks
25%synergy
Unholy Annex // Ritual Chamber
31%inclusion10 decks32 decks
30%synergy
Grand Entryway // Elegant Rotunda
31%inclusion10 decks32 decks
31%synergy
Estrid's Invocation
31%inclusion10 decks32 decks
27%synergy
Cemetery Tampering
31%inclusion10 decks32 decks
31%synergy
Ethereal Armor
31%inclusion10 decks32 decks
27%synergy
Dollmaker's Shop // Porcelain Gallery
31%inclusion10 decks32 decks
30%synergy
Cacophony Unleashed
25%inclusion8 decks32 decks
23%synergy
Mystic Remora
25%inclusion8 decks32 decks
4%synergy
Seal of Cleansing
25%inclusion8 decks32 decks
23%synergy
Necromancy
22%inclusion7 decks32 decks
17%synergy
Starfield of Nyx
22%inclusion7 decks32 decks
18%synergy
Monologue Tax
22%inclusion7 decks32 decks
16%synergy
Phyrexian Arena
22%inclusion7 decks32 decks
8%synergy
Extravagant Replication
22%inclusion7 decks32 decks
17%synergy
Shark Typhoon
22%inclusion7 decks32 decks
16%synergy
Stillness in Motion
22%inclusion5 decks23 decks
21%synergy
Grasp of Fate
19%inclusion6 decks32 decks
13%synergy
Timely Ward
19%inclusion6 decks32 decks
14%synergy
Sheltered by Ghosts
19%inclusion6 decks32 decks
16%synergy
Hallowed Haunting
19%inclusion6 decks32 decks
16%synergy
All That Glitters
19%inclusion6 decks32 decks
10%synergy
Dress Down
19%inclusion6 decks32 decks
16%synergy
One with the Multiverse
16%inclusion5 decks32 decks
11%synergy
Black Market Connections
16%inclusion5 decks32 decks
2%synergy
Nowhere to Run
16%inclusion5 decks32 decks
14%synergy
Imprisoned in the Moon
16%inclusion5 decks32 decks
9%synergy
Copy Enchantment
16%inclusion5 decks32 decks
11%synergy
Glasswing Grace
13%inclusion4 decks32 decks
10%synergy
The Eldest Reborn
13%inclusion4 decks32 decks
10%synergy
Blind Obedience
13%inclusion4 decks32 decks
0%synergy
Virtue of Persistence
13%inclusion4 decks32 decks
11%synergy
The Tale of Tamiyo
13%inclusion4 decks32 decks
12%synergy
Sothera, the Supervoid
11%inclusion2 decks19 decks
10%synergy
Darksteel Mutation
9.4%inclusion3 decks32 decks
3%synergy
Staggering Insight
9.4%inclusion3 decks32 decks
7%synergy
Trapped in the Screen
9.4%inclusion3 decks32 decks
9%synergy
Court of Cunning
9.4%inclusion3 decks32 decks
8%synergy
Demonic Covenant
9.4%inclusion3 decks32 decks
9%synergy
Unable to Scream
9.4%inclusion3 decks32 decks
8%synergy
Battles
Invasion of Theros
13%inclusion4 decks32 decks
11%synergy
Utility Lands
Hall of Heliod's Generosity
59%inclusion19 decks32 decks
46%synergy
Bojuka Bog
28%inclusion9 decks32 decks
1%synergy
Nephalia Drownyard
22%inclusion7 decks32 decks
21%synergy
Halimar Depths
16%inclusion5 decks32 decks
11%synergy
Reliquary Tower
16%inclusion5 decks32 decks
-18%synergy
Urborg, Tomb of Yawgmoth
9.4%inclusion3 decks32 decks
-4%synergy
Restless Reef
9.4%inclusion3 decks32 decks
8%synergy
Cephalid Coliseum
9.4%inclusion3 decks32 decks
6%synergy
Rogue's Passage
9.4%inclusion3 decks32 decks
0%synergy
Duskmantle, House of Shadow
6.3%inclusion2 decks32 decks
6%synergy
Drownyard Temple
6.3%inclusion2 decks32 decks
6%synergy
Temple of the False God
6.3%inclusion2 decks32 decks
-1%synergy
Dakmor Salvage
6.3%inclusion2 decks32 decks
6%synergy
Otawara, Soaring City
6.3%inclusion2 decks32 decks
-13%synergy
Ishgard, the Holy See
5.0%inclusion1 decks20 decks
1%synergy
Mana Artifacts
Sol Ring
84%inclusion27 decks32 decks
-6%synergy
Arcane Signet
78%inclusion25 decks32 decks
-10%synergy
Talisman of Progress
25%inclusion8 decks32 decks
-18%synergy
Azorius Signet
25%inclusion8 decks32 decks
-7%synergy
Talisman of Dominance
22%inclusion7 decks32 decks
-27%synergy
Orzhov Signet
22%inclusion7 decks32 decks
-13%synergy
Talisman of Hierarchy
19%inclusion6 decks32 decks
-24%synergy
Commander's Sphere
13%inclusion4 decks32 decks
-7%synergy
Mind Stone
13%inclusion4 decks32 decks
0%synergy
Dimir Signet
9.4%inclusion3 decks32 decks
-23%synergy
Chromatic Lantern
6.3%inclusion2 decks32 decks
-7%synergy
Bender's Waterskin
5.9%inclusion1 decks17 decks
2%synergy
Lands
Command Tower
97%inclusion31 decks32 decks
4%synergy
Island
97%inclusion31 decks32 decks
4%synergy
Swamp
97%inclusion31 decks32 decks
6%synergy
Plains
97%inclusion31 decks32 decks
5%synergy
Arcane Sanctum
75%inclusion24 decks32 decks
20%synergy
Caves of Koilos
59%inclusion19 decks32 decks
24%synergy
Valgavoth's Lair
53%inclusion17 decks32 decks
50%synergy
Glacial Fortress
50%inclusion16 decks32 decks
10%synergy
Prairie Stream
50%inclusion16 decks32 decks
9%synergy
Sunken Hollow
50%inclusion16 decks32 decks
10%synergy
Exotic Orchard
50%inclusion16 decks32 decks
-9%synergy
Temple of Deceit
47%inclusion15 decks32 decks
29%synergy
Adarkar Wastes
47%inclusion15 decks32 decks
16%synergy
Azorius Chancery
44%inclusion14 decks32 decks
29%synergy
Isolated Chapel
44%inclusion14 decks32 decks
5%synergy
Underground River
44%inclusion14 decks32 decks
11%synergy
Obscura Storefront
44%inclusion14 decks32 decks
33%synergy
Temple of Enlightenment
44%inclusion14 decks32 decks
27%synergy
Dimir Aqueduct
41%inclusion13 decks32 decks
27%synergy
Orzhov Basilica
41%inclusion13 decks32 decks
25%synergy
Temple of Silence
41%inclusion13 decks32 decks
21%synergy
Contaminated Landscape
38%inclusion12 decks32 decks
23%synergy
Drowned Catacomb
34%inclusion11 decks32 decks
-1%synergy
Raffine's Tower
34%inclusion11 decks32 decks
-7%synergy
Evolving Wilds
31%inclusion10 decks32 decks
6%synergy
Hallowed Fountain
28%inclusion9 decks32 decks
-21%synergy
Terramorphic Expanse
25%inclusion8 decks32 decks
8%synergy
Darkwater Catacombs
25%inclusion8 decks32 decks
11%synergy
Godless Shrine
25%inclusion8 decks32 decks
-25%synergy
Vault of Champions
22%inclusion7 decks32 decks
-11%synergy
Tainted Field
19%inclusion6 decks32 decks
12%synergy
Skycloud Expanse
19%inclusion6 decks32 decks
4%synergy
Flooded Strand
19%inclusion6 decks32 decks
-19%synergy
Tainted Isle
16%inclusion5 decks32 decks
9%synergy
Abandoned Campground
16%inclusion5 decks32 decks
15%synergy
Murky Sewer
16%inclusion5 decks32 decks
15%synergy
Floodfarm Verge
16%inclusion5 decks32 decks
4%synergy
Watery Grave
16%inclusion5 decks32 decks
-34%synergy
Myriad Landscape
16%inclusion5 decks32 decks
7%synergy
Ash Barrens
16%inclusion5 decks32 decks
5%synergy
Thriving Moor
16%inclusion5 decks32 decks
11%synergy
Meticulous Archive
16%inclusion5 decks32 decks
2%synergy
Shadowy Backstreet
13%inclusion4 decks32 decks
0%synergy
Glasswing Grace
13%inclusion4 decks32 decks
10%synergy
Witch Enchanter
13%inclusion4 decks32 decks
6%synergy
Port Town
13%inclusion4 decks32 decks
-4%synergy
Shipwreck Marsh
13%inclusion4 decks32 decks
-8%synergy
Path of Ancestry
13%inclusion4 decks32 decks
-15%synergy
Sink into Stupor
13%inclusion4 decks32 decks
0%synergy
Neglected Manor
13%inclusion4 decks32 decks
12%synergy
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