The Master of Keys (Commander) - Expensive 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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Wan Shi Tong, Librarian
100%inclusion1 decks1 decks
95%synergy
Wan Shi Tong, All-Knowing
100%inclusion1 decks1 decks
100%synergy
Benevolent River Spirit
100%inclusion1 decks1 decks
100%synergy
Dutiful Knowledge Seeker
100%inclusion1 decks1 decks
100%synergy
Koh, the Face Stealer
100%inclusion1 decks1 decks
100%synergy
Game Changers
Smothering Tithe
100%inclusion3 decks3 decks
68%synergy
Cyclonic Rift
67%inclusion2 decks3 decks
42%synergy
Rhystic Study
33%inclusion1 decks3 decks
1%synergy
Enlightened Tutor
33%inclusion1 decks3 decks
13%synergy
Fierce Guardianship
33%inclusion1 decks3 decks
13%synergy
Creatures
Inquisitive Glimmer
100%inclusion3 decks3 decks
92%synergy
Enduring Curiosity
100%inclusion3 decks3 decks
92%synergy
Fear of Sleep Paralysis
100%inclusion3 decks3 decks
94%synergy
Overlord of the Floodpits
67%inclusion2 decks3 decks
63%synergy
Demon of Fate's Design
67%inclusion2 decks3 decks
61%synergy
Esper Sentinel
67%inclusion2 decks3 decks
39%synergy
Overlord of the Balemurk
67%inclusion2 decks3 decks
65%synergy
Silent Hallcreeper
67%inclusion2 decks3 decks
62%synergy
Mesa Enchantress
67%inclusion2 decks3 decks
58%synergy
Ancient Cellarspawn
67%inclusion2 decks3 decks
63%synergy
Grand Abolisher
67%inclusion2 decks3 decks
52%synergy
Entity Tracker
67%inclusion2 decks3 decks
60%synergy
Rikku, Resourceful Guardian
50%inclusion1 decks2 decks
50%synergy
Yue, the Moon Spirit
50%inclusion1 decks2 decks
50%synergy
Scrabbling Skullcrab
33%inclusion1 decks3 decks
32%synergy
Starfield Mystic
33%inclusion1 decks3 decks
27%synergy
Starving Revenant
33%inclusion1 decks3 decks
33%synergy
The Mindskinner
33%inclusion1 decks3 decks
33%synergy
Eidolon of Rhetoric
33%inclusion1 decks3 decks
32%synergy
Sheoldred, the Apocalypse
33%inclusion1 decks3 decks
25%synergy
Ornithopter of Paradise
33%inclusion1 decks3 decks
26%synergy
Arna Kennerüd, Skycaptain
33%inclusion1 decks3 decks
31%synergy
Danitha Capashen, Paragon
33%inclusion1 decks3 decks
30%synergy
Nighthowler
33%inclusion1 decks3 decks
33%synergy
Elesh Norn, Mother of Machines
33%inclusion1 decks3 decks
31%synergy
Heliod, Sun-Crowned
33%inclusion1 decks3 decks
29%synergy
Soaring Lightbringer
33%inclusion1 decks3 decks
28%synergy
Drogskol Reaver
33%inclusion1 decks3 decks
29%synergy
Drogskol Reinforcements
33%inclusion1 decks3 decks
33%synergy
Hedron Crab
33%inclusion1 decks3 decks
33%synergy
Ruin Crab
33%inclusion1 decks3 decks
32%synergy
Fear of the Dark
33%inclusion1 decks3 decks
33%synergy
Victor, Valgavoth's Seneschal
33%inclusion1 decks3 decks
31%synergy
Enduring Innocence
33%inclusion1 decks3 decks
32%synergy
Enduring Tenacity
33%inclusion1 decks3 decks
26%synergy
Arvinox, the Mind Flail
33%inclusion1 decks3 decks
32%synergy
Pearl-Ear, Imperial Advisor
33%inclusion1 decks3 decks
31%synergy
Archetype of Imagination
33%inclusion1 decks3 decks
29%synergy
Moonshaker Cavalry
33%inclusion1 decks3 decks
30%synergy
Doomwake Giant
33%inclusion1 decks3 decks
27%synergy
Aminatou, Veil Piercer
33%inclusion1 decks3 decks
32%synergy
Grim Guardian
33%inclusion1 decks3 decks
31%synergy
Heliod, the Radiant Dawn
33%inclusion1 decks3 decks
30%synergy
Ghostly Dancers
33%inclusion1 decks3 decks
31%synergy
Valgavoth, Terror Eater
33%inclusion1 decks3 decks
30%synergy
Zur, Eternal Schemer
33%inclusion1 decks3 decks
30%synergy
Hullbreaker Horror
33%inclusion1 decks3 decks
27%synergy
Ketramose, the New Dawn
33%inclusion1 decks3 decks
33%synergy
Ledger Shredder
33%inclusion1 decks3 decks
24%synergy
Mindwrack Harpy
33%inclusion1 decks3 decks
33%synergy
Instants
Void Rend
67%inclusion2 decks3 decks
33%synergy
Swords to Plowshares
67%inclusion2 decks3 decks
-2%synergy
Path to Exile
67%inclusion2 decks3 decks
25%synergy
Mental Misstep
33%inclusion1 decks3 decks
26%synergy
Dovin's Veto
33%inclusion1 decks3 decks
8%synergy
An Offer You Can't Refuse
33%inclusion1 decks3 decks
7%synergy
Refute
33%inclusion1 decks3 decks
31%synergy
Dark Ritual
33%inclusion1 decks3 decks
14%synergy
Mana Drain
33%inclusion1 decks3 decks
16%synergy
Flusterstorm
33%inclusion1 decks3 decks
25%synergy
Force of Negation
33%inclusion1 decks3 decks
21%synergy
Counterspell
33%inclusion1 decks3 decks
-8%synergy
Pact of Negation
33%inclusion1 decks3 decks
25%synergy
Batwing Brume
33%inclusion1 decks3 decks
33%synergy
Sorceries
Wash Out
33%inclusion1 decks3 decks
33%synergy
Blood Money
33%inclusion1 decks3 decks
33%synergy
Toxic Deluge
33%inclusion1 decks3 decks
14%synergy
Cruel Tutor
33%inclusion1 decks3 decks
33%synergy
Maddening Cacophony
33%inclusion1 decks3 decks
32%synergy
Stream of Thought
33%inclusion1 decks3 decks
33%synergy
Redress Fate
33%inclusion1 decks3 decks
27%synergy
Breach the Multiverse
33%inclusion1 decks3 decks
31%synergy
Utility Artifacts
The Water Crystal
50%inclusion1 decks2 decks
48%synergy
Mesmeric Orb
33%inclusion1 decks3 decks
32%synergy
Perpetual Timepiece
33%inclusion1 decks3 decks
33%synergy
Cloud Key
33%inclusion1 decks3 decks
30%synergy
Sword of Fire and Ice
33%inclusion1 decks3 decks
31%synergy
Crucible of Worlds
33%inclusion1 decks3 decks
32%synergy
Helm of the Gods
33%inclusion1 decks3 decks
32%synergy
Mask of the Schemer
33%inclusion1 decks3 decks
32%synergy
Excalibur, Sword of Eden
33%inclusion1 decks3 decks
31%synergy
Sword of Feast and Famine
33%inclusion1 decks3 decks
30%synergy
Codex Shredder
33%inclusion1 decks3 decks
33%synergy
Helm of Awakening
33%inclusion1 decks3 decks
33%synergy
Enchantments
Mystic Remora
100%inclusion3 decks3 decks
79%synergy
Dazzling Theater // Prop Room
100%inclusion3 decks3 decks
98%synergy
Ghostly Prison
100%inclusion3 decks3 decks
78%synergy
Ripples of Undeath
67%inclusion2 decks3 decks
64%synergy
Mirrormade
67%inclusion2 decks3 decks
57%synergy
Estrid's Invocation
67%inclusion2 decks3 decks
62%synergy
Blessing of Leeches
67%inclusion2 decks3 decks
66%synergy
Restricted Office // Lecture Hall
67%inclusion2 decks3 decks
64%synergy
Animate Dead
67%inclusion2 decks3 decks
57%synergy
Secret Arcade // Dusty Parlor
67%inclusion2 decks3 decks
62%synergy
Polluted Cistern // Dim Oubliette
67%inclusion2 decks3 decks
66%synergy
Sheltered by Ghosts
67%inclusion2 decks3 decks
64%synergy
Black Market Connections
67%inclusion2 decks3 decks
53%synergy
Propaganda
67%inclusion2 decks3 decks
40%synergy
Sothera, the Supervoid
50%inclusion1 decks2 decks
50%synergy
Darksteel Mutation
33%inclusion1 decks3 decks
27%synergy
Overwhelming Splendor
33%inclusion1 decks3 decks
33%synergy
Polluted Bonds
33%inclusion1 decks3 decks
32%synergy
Cacophony Unleashed
33%inclusion1 decks3 decks
32%synergy
Protective Bubble
33%inclusion1 decks3 decks
33%synergy
Songbirds' Blessing
33%inclusion1 decks3 decks
32%synergy
Drake Umbra
33%inclusion1 decks3 decks
33%synergy
Psychic Corrosion
33%inclusion1 decks3 decks
32%synergy
Imprisoned in the Moon
33%inclusion1 decks3 decks
27%synergy
Obscura Ascendancy
33%inclusion1 decks3 decks
33%synergy
Sigil of the Empty Throne
33%inclusion1 decks3 decks
27%synergy
Tinybones Joins Up
33%inclusion1 decks3 decks
32%synergy
Aspect of Gorgon
33%inclusion1 decks3 decks
33%synergy
Blind Obedience
33%inclusion1 decks3 decks
21%synergy
Cloak of Invisibility
33%inclusion1 decks3 decks
33%synergy
Necromancy
33%inclusion1 decks3 decks
29%synergy
Shark Typhoon
33%inclusion1 decks3 decks
28%synergy
Starfield of Nyx
33%inclusion1 decks3 decks
29%synergy
Central Elevator // Promising Stairs
33%inclusion1 decks3 decks
33%synergy
Sphere of Safety
33%inclusion1 decks3 decks
24%synergy
Michiko's Reign of Truth
33%inclusion1 decks3 decks
33%synergy
Asha's Favor
33%inclusion1 decks3 decks
33%synergy
Funeral Room // Awakening Hall
33%inclusion1 decks3 decks
32%synergy
Amphibian Downpour
33%inclusion1 decks3 decks
29%synergy
All That Glitters
33%inclusion1 decks3 decks
25%synergy
Sage's Reverie
33%inclusion1 decks3 decks
31%synergy
Dress Down
33%inclusion1 decks3 decks
31%synergy
Painful Quandary
33%inclusion1 decks3 decks
31%synergy
Revel in Riches
33%inclusion1 decks3 decks
32%synergy
Ethereal Armor
33%inclusion1 decks3 decks
29%synergy
Hallowed Haunting
33%inclusion1 decks3 decks
31%synergy
Dollmaker's Shop // Porcelain Gallery
33%inclusion1 decks3 decks
32%synergy
Mirror Room // Fractured Realm
33%inclusion1 decks3 decks
31%synergy
Oversold Cemetery
33%inclusion1 decks3 decks
31%synergy
Defiled Crypt // Cadaver Lab
33%inclusion1 decks3 decks
33%synergy
Utility Lands
Hall of Heliod's Generosity
67%inclusion2 decks3 decks
54%synergy
Reliquary Tower
67%inclusion2 decks3 decks
33%synergy
Otawara, Soaring City
67%inclusion2 decks3 decks
47%synergy
Urza's Saga
33%inclusion1 decks3 decks
21%synergy
Cabal Coffers
33%inclusion1 decks3 decks
30%synergy
Dakmor Salvage
33%inclusion1 decks3 decks
33%synergy
Urborg, Tomb of Yawgmoth
33%inclusion1 decks3 decks
20%synergy
Mana Artifacts
Arcane Signet
67%inclusion2 decks3 decks
-21%synergy
Sol Ring
67%inclusion2 decks3 decks
-23%synergy
Talisman of Progress
33%inclusion1 decks3 decks
-10%synergy
Chromatic Lantern
33%inclusion1 decks3 decks
20%synergy
Crystal Skull, Isu Spyglass
33%inclusion1 decks3 decks
32%synergy
Azorius Signet
33%inclusion1 decks3 decks
1%synergy
Lands
Command Tower
100%inclusion3 decks3 decks
8%synergy
Swamp
100%inclusion3 decks3 decks
9%synergy
Raffine's Tower
100%inclusion3 decks3 decks
59%synergy
Island
100%inclusion3 decks3 decks
7%synergy
Plains
100%inclusion3 decks3 decks
9%synergy
Vault of Champions
100%inclusion3 decks3 decks
67%synergy
Prairie Stream
67%inclusion2 decks3 decks
26%synergy
Sea of Clouds
67%inclusion2 decks3 decks
31%synergy
Godless Shrine
67%inclusion2 decks3 decks
16%synergy
Arcane Sanctum
67%inclusion2 decks3 decks
12%synergy
Isolated Chapel
67%inclusion2 decks3 decks
28%synergy
Gloomlake Verge
67%inclusion2 decks3 decks
56%synergy
Hallowed Fountain
67%inclusion2 decks3 decks
17%synergy
Floodfarm Verge
67%inclusion2 decks3 decks
55%synergy
Flooded Strand
67%inclusion2 decks3 decks
29%synergy
Glacial Fortress
33%inclusion1 decks3 decks
-7%synergy
Undercity Sewers
33%inclusion1 decks3 decks
19%synergy
Clearwater Pathway
33%inclusion1 decks3 decks
27%synergy
Azorius Chancery
33%inclusion1 decks3 decks
19%synergy
Brightclimb Pathway
33%inclusion1 decks3 decks
26%synergy
Exotic Orchard
33%inclusion1 decks3 decks
-25%synergy
Caves of Koilos
33%inclusion1 decks3 decks
-2%synergy
Dimir Aqueduct
33%inclusion1 decks3 decks
19%synergy
Riveteers Overlook
33%inclusion1 decks3 decks
33%synergy
Darkslick Shores
33%inclusion1 decks3 decks
30%synergy
Orzhov Basilica
33%inclusion1 decks3 decks
17%synergy
Morphic Pool
33%inclusion1 decks3 decks
-1%synergy
Meticulous Archive
33%inclusion1 decks3 decks
20%synergy
Marsh Flats
33%inclusion1 decks3 decks
-3%synergy
Polluted Delta
33%inclusion1 decks3 decks
-4%synergy
Deserted Beach
33%inclusion1 decks3 decks
12%synergy
Watery Grave
33%inclusion1 decks3 decks
-17%synergy
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