The Master of Keys (Commander) - Rooms

The Master of Keys
Rank #300
38decks
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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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Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Eiganjo Dynastorian
14%inclusion1 decks7 decks
13%synergy
Turbulent Moor
14%inclusion1 decks7 decks
11%synergy
Restoration Seminar
14%inclusion1 decks7 decks
13%synergy
High Synergy Cards
Central Elevator // Promising Stairs
89%inclusion34 decks38 decks
89%synergy
Inquisitive Glimmer
95%inclusion36 decks38 decks
88%synergy
Defiled Crypt // Cadaver Lab
82%inclusion31 decks38 decks
81%synergy
Restricted Office // Lecture Hall
82%inclusion31 decks38 decks
80%synergy
Fear of Sleep Paralysis
82%inclusion31 decks38 decks
77%synergy
Entity Tracker
82%inclusion31 decks38 decks
76%synergy
Secret Arcade // Dusty Parlor
79%inclusion30 decks38 decks
74%synergy
Dazzling Theater // Prop Room
71%inclusion27 decks38 decks
70%synergy
Ghostly Dancers
71%inclusion27 decks38 decks
69%synergy
Polluted Cistern // Dim Oubliette
68%inclusion26 decks38 decks
68%synergy
Top Cards
Bottomless Pool // Locker Room
68%inclusion26 decks38 decks
67%synergy
Cramped Vents // Access Maze
66%inclusion25 decks38 decks
64%synergy
Mesa Enchantress
66%inclusion25 decks38 decks
57%synergy
Victor, Valgavoth's Seneschal
66%inclusion25 decks38 decks
64%synergy
Mirror Room // Fractured Realm
66%inclusion25 decks38 decks
64%synergy
Overlord of the Floodpits
61%inclusion23 decks38 decks
57%synergy
Demon of Fate's Design
61%inclusion23 decks38 decks
55%synergy
Ripples of Undeath
58%inclusion22 decks38 decks
55%synergy
Scrabbling Skullcrab
58%inclusion22 decks38 decks
57%synergy
Sphere of Safety
58%inclusion22 decks38 decks
49%synergy
Game Changers
Smothering Tithe
21%inclusion8 decks38 decks
-9%synergy
Rhystic Study
13%inclusion5 decks38 decks
-18%synergy
Vampiric Tutor
7.9%inclusion3 decks38 decks
-9%synergy
Enlightened Tutor
7.9%inclusion3 decks38 decks
-11%synergy
Cyclonic Rift
7.9%inclusion3 decks38 decks
-15%synergy
Demonic Tutor
5.3%inclusion2 decks38 decks
-15%synergy
Creatures
Starfield Mystic
55%inclusion21 decks38 decks
49%synergy
Gravebreaker Lamia
55%inclusion21 decks38 decks
54%synergy
Doomwake Giant
55%inclusion21 decks38 decks
49%synergy
Enduring Curiosity
55%inclusion21 decks38 decks
47%synergy
Overlord of the Balemurk
47%inclusion18 decks38 decks
46%synergy
Silent Hallcreeper
47%inclusion18 decks38 decks
43%synergy
Fear of Impostors
45%inclusion17 decks38 decks
43%synergy
Soaring Lightbringer
45%inclusion17 decks38 decks
40%synergy
Overlord of the Mistmoors
42%inclusion16 decks38 decks
40%synergy
Zur, Eternal Schemer
42%inclusion16 decks38 decks
39%synergy
Ondu Spiritdancer
39%inclusion15 decks38 decks
33%synergy
Fear of Infinity
34%inclusion13 decks38 decks
34%synergy
Moon-Blessed Cleric
34%inclusion13 decks38 decks
30%synergy
Balemurk Leech
32%inclusion12 decks38 decks
31%synergy
Ancient Cellarspawn
32%inclusion12 decks38 decks
29%synergy
Aminatou, Veil Piercer
32%inclusion12 decks38 decks
30%synergy
Skullsnap Nuisance
29%inclusion11 decks38 decks
29%synergy
Gremlin Tamer
29%inclusion11 decks38 decks
28%synergy
Ghostly Keybearer
29%inclusion11 decks38 decks
29%synergy
Grim Guardian
24%inclusion9 decks38 decks
21%synergy
Heliod, the Radiant Dawn
24%inclusion9 decks38 decks
20%synergy
Zur the Enchanter
24%inclusion9 decks38 decks
19%synergy
Archetype of Imagination
21%inclusion8 decks38 decks
16%synergy
Creeping Peeper
21%inclusion8 decks38 decks
21%synergy
Sage of Mysteries
18%inclusion7 decks38 decks
18%synergy
Optimistic Scavenger
16%inclusion6 decks38 decks
15%synergy
Archon of Sun's Grace
16%inclusion6 decks38 decks
11%synergy
Nashi, Searcher in the Dark
16%inclusion6 decks38 decks
15%synergy
Spirited Companion
16%inclusion6 decks38 decks
14%synergy
Mindwrack Harpy
16%inclusion6 decks38 decks
15%synergy
Emet-Selch of the Third Seat
15%inclusion4 decks27 decks
5%synergy
Fear of Surveillance
13%inclusion5 decks38 decks
13%synergy
Athreos, Shroud-Veiled
13%inclusion5 decks38 decks
9%synergy
Solemn Simulacrum
11%inclusion4 decks38 decks
-3%synergy
Witch Enchanter
11%inclusion4 decks38 decks
4%synergy
Dashing Bloodsucker
11%inclusion4 decks38 decks
11%synergy
Hedron Crab
11%inclusion4 decks38 decks
10%synergy
Fear of the Dark
11%inclusion4 decks38 decks
10%synergy
Nightmare Shepherd
11%inclusion4 decks38 decks
8%synergy
Alseid of Life's Bounty
11%inclusion4 decks38 decks
9%synergy
Callaphe, Beloved of the Sea
11%inclusion4 decks38 decks
9%synergy
Erratic Apparition
7.9%inclusion3 decks38 decks
8%synergy
The Ancient One
7.9%inclusion3 decks38 decks
8%synergy
Agent of Erebos
7.9%inclusion3 decks38 decks
7%synergy
Stalked Researcher
7.9%inclusion3 decks38 decks
8%synergy
Auramancer
7.9%inclusion3 decks38 decks
5%synergy
Cult Healer
7.9%inclusion3 decks38 decks
8%synergy
Unwilling Vessel
7.9%inclusion3 decks38 decks
8%synergy
Millikin
7.9%inclusion3 decks38 decks
7%synergy
Fear of Immobility
7.9%inclusion3 decks38 decks
8%synergy
Instants
Path to Exile
42%inclusion16 decks38 decks
0%synergy
Swords to Plowshares
39%inclusion15 decks38 decks
-28%synergy
Counterspell
32%inclusion12 decks38 decks
-10%synergy
Void Rend
29%inclusion11 decks38 decks
-6%synergy
Arcane Denial
26%inclusion10 decks38 decks
6%synergy
An Offer You Can't Refuse
18%inclusion7 decks38 decks
-9%synergy
Dovin's Veto
16%inclusion6 decks38 decks
-10%synergy
Frantic Search
16%inclusion6 decks38 decks
-3%synergy
Thirst for Meaning
16%inclusion6 decks38 decks
14%synergy
Get Out
13%inclusion5 decks38 decks
13%synergy
Dark Ritual
11%inclusion4 decks38 decks
-10%synergy
Sink into Stupor
11%inclusion4 decks38 decks
-2%synergy
Faithful Mending
11%inclusion4 decks38 decks
7%synergy
Utter End
11%inclusion4 decks38 decks
4%synergy
Inkshield
11%inclusion4 decks38 decks
1%synergy
Fell the Profane
7.9%inclusion3 decks38 decks
-1%synergy
Brainstorm
7.9%inclusion3 decks38 decks
-9%synergy
Fact or Fiction
7.9%inclusion3 decks38 decks
4%synergy
Long River's Pull
7.9%inclusion3 decks38 decks
7%synergy
Waterlogged Teachings
7.9%inclusion3 decks38 decks
3%synergy
Return to Dust
5.3%inclusion2 decks38 decks
2%synergy
Entomb
5.3%inclusion2 decks38 decks
-1%synergy
Negate
5.3%inclusion2 decks38 decks
-11%synergy
Mana Drain
5.3%inclusion2 decks38 decks
-12%synergy
Flusterstorm
5.3%inclusion2 decks38 decks
-3%synergy
Murder
5.3%inclusion2 decks38 decks
4%synergy
Don't Make a Sound
5.3%inclusion2 decks38 decks
5%synergy
Anguished Unmaking
5.3%inclusion2 decks38 decks
-20%synergy
Otherworldly Gaze
5.3%inclusion2 decks38 decks
3%synergy
Withering Torment
5.3%inclusion2 decks38 decks
4%synergy
Sorceries
Redress Fate
37%inclusion14 decks38 decks
31%synergy
Extinguish All Hope
29%inclusion11 decks38 decks
27%synergy
Dance of the Manse
26%inclusion10 decks38 decks
23%synergy
Time Wipe
21%inclusion8 decks38 decks
15%synergy
Sevinne's Reclamation
18%inclusion7 decks38 decks
10%synergy
Resurgent Belief
16%inclusion6 decks38 decks
14%synergy
Reanimate
13%inclusion5 decks38 decks
-3%synergy
Damn
11%inclusion4 decks38 decks
-10%synergy
Windfall
7.9%inclusion3 decks38 decks
-5%synergy
Supreme Verdict
7.9%inclusion3 decks38 decks
-7%synergy
Abuelo's Awakening
7.9%inclusion3 decks38 decks
8%synergy
Demonic Counsel
7.9%inclusion3 decks38 decks
7%synergy
Diresight
7.9%inclusion3 decks38 decks
7%synergy
Toxic Deluge
7.9%inclusion3 decks38 decks
-12%synergy
Winnowing
6.3%inclusion1 decks16 decks
5%synergy
Stock Up
6.1%inclusion2 decks33 decks
4%synergy
Blasphemous Edict
5.6%inclusion2 decks36 decks
3%synergy
Ponder
5.3%inclusion2 decks38 decks
-4%synergy
Commune with Evil
5.3%inclusion2 decks38 decks
5%synergy
Open the Vaults
5.3%inclusion2 decks38 decks
4%synergy
Chart a Course
5.3%inclusion2 decks38 decks
4%synergy
Split Up
5.3%inclusion2 decks38 decks
4%synergy
Plea for Guidance
5.3%inclusion2 decks38 decks
5%synergy
Idyllic Tutor
5.3%inclusion2 decks38 decks
1%synergy
Starfall Invocation
5.3%inclusion2 decks38 decks
3%synergy
Living Death
5.3%inclusion2 decks38 decks
1%synergy
Breach the Multiverse
5.3%inclusion2 decks38 decks
3%synergy
Exhume
5.3%inclusion2 decks38 decks
5%synergy
Utility Artifacts
Keys to the House
47%inclusion18 decks38 decks
47%synergy
Cloud Key
18%inclusion7 decks38 decks
15%synergy
Wayfarer's Bauble
7.9%inclusion3 decks38 decks
1%synergy
The Key to the Vault
7.9%inclusion3 decks38 decks
5%synergy
Whip of Erebos
7.9%inclusion3 decks38 decks
6%synergy
Mystery Key
7.9%inclusion3 decks38 decks
8%synergy
Swiftfoot Boots
7.9%inclusion3 decks38 decks
-16%synergy
Key to the City
7.9%inclusion3 decks38 decks
7%synergy
Lightning Greaves
7.9%inclusion3 decks38 decks
-15%synergy
Mesmeric Orb
5.3%inclusion2 decks38 decks
4%synergy
Skeleton Key
5.3%inclusion2 decks38 decks
5%synergy
Manifold Key
5.3%inclusion2 decks38 decks
4%synergy
Glimmerlight
5.3%inclusion2 decks38 decks
5%synergy
Bident of Thassa
5.3%inclusion2 decks38 decks
-3%synergy
Enchantments
Meat Locker // Drowned Diner
55%inclusion21 decks38 decks
55%synergy
Underwater Tunnel // Slimy Aquarium
53%inclusion20 decks38 decks
52%synergy
Derelict Attic // Widow's Walk
53%inclusion20 decks38 decks
52%synergy
Surgical Suite // Hospital Room
50%inclusion19 decks38 decks
50%synergy
Funeral Room // Awakening Hall
50%inclusion19 decks38 decks
49%synergy
Sigil of the Empty Throne
47%inclusion18 decks38 decks
42%synergy
Propaganda
45%inclusion17 decks38 decks
16%synergy
Unholy Annex // Ritual Chamber
42%inclusion16 decks38 decks
41%synergy
Ghostly Prison
42%inclusion16 decks38 decks
19%synergy
Dollmaker's Shop // Porcelain Gallery
39%inclusion15 decks38 decks
38%synergy
Grand Entryway // Elegant Rotunda
39%inclusion15 decks38 decks
39%synergy
Animate Dead
37%inclusion14 decks38 decks
27%synergy
Mirrormade
34%inclusion13 decks38 decks
24%synergy
Cemetery Tampering
29%inclusion11 decks38 decks
28%synergy
Estrid's Invocation
26%inclusion10 decks38 decks
22%synergy
Ethereal Armor
26%inclusion10 decks38 decks
22%synergy
Hallowed Haunting
26%inclusion10 decks38 decks
24%synergy
Cacophony Unleashed
24%inclusion9 decks38 decks
22%synergy
Shark Typhoon
24%inclusion9 decks38 decks
18%synergy
Extravagant Replication
21%inclusion8 decks38 decks
16%synergy
Seal of Cleansing
21%inclusion8 decks38 decks
20%synergy
Starfield of Nyx
21%inclusion8 decks38 decks
17%synergy
Monologue Tax
21%inclusion8 decks38 decks
15%synergy
Sheltered by Ghosts
18%inclusion7 decks38 decks
16%synergy
Mystic Remora
18%inclusion7 decks38 decks
-2%synergy
Timely Ward
18%inclusion7 decks38 decks
14%synergy
All That Glitters
18%inclusion7 decks38 decks
10%synergy
Dress Down
18%inclusion7 decks38 decks
16%synergy
Phyrexian Arena
18%inclusion7 decks38 decks
4%synergy
Stillness in Motion
17%inclusion5 decks30 decks
16%synergy
One with the Multiverse
16%inclusion6 decks38 decks
11%synergy
Grasp of Fate
16%inclusion6 decks38 decks
10%synergy
Necromancy
16%inclusion6 decks38 decks
11%synergy
Copy Enchantment
16%inclusion6 decks38 decks
11%synergy
Imprisoned in the Moon
13%inclusion5 decks38 decks
6%synergy
Nowhere to Run
13%inclusion5 decks38 decks
12%synergy
Court of Cunning
11%inclusion4 decks38 decks
10%synergy
Blind Obedience
11%inclusion4 decks38 decks
-1%synergy
Glasswing Grace
11%inclusion4 decks38 decks
8%synergy
Unable to Scream
11%inclusion4 decks38 decks
10%synergy
Black Market Connections
11%inclusion4 decks38 decks
-4%synergy
Amphibian Downpour
11%inclusion4 decks38 decks
6%synergy
Virtue of Persistence
11%inclusion4 decks38 decks
9%synergy
Northern Air Temple
10%inclusion2 decks21 decks
9%synergy
The Spirit Oasis
10%inclusion2 decks21 decks
9%synergy
Southern Air Temple
8.0%inclusion2 decks25 decks
8%synergy
Staggering Insight
7.9%inclusion3 decks38 decks
6%synergy
Trapped in the Screen
7.9%inclusion3 decks38 decks
7%synergy
Demonic Covenant
7.9%inclusion3 decks38 decks
8%synergy
Shardmage's Rescue
7.9%inclusion3 decks38 decks
8%synergy
Battles
Invasion of Theros
11%inclusion4 decks38 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion21 decks38 decks
42%synergy
Bojuka Bog
29%inclusion11 decks38 decks
2%synergy
Nephalia Drownyard
18%inclusion7 decks38 decks
18%synergy
Reliquary Tower
18%inclusion7 decks38 decks
-16%synergy
Halimar Depths
16%inclusion6 decks38 decks
11%synergy
Rogue's Passage
11%inclusion4 decks38 decks
1%synergy
Cephalid Coliseum
7.9%inclusion3 decks38 decks
4%synergy
Temple of the False God
7.9%inclusion3 decks38 decks
0%synergy
Restless Reef
7.9%inclusion3 decks38 decks
7%synergy
Takenuma, Abandoned Mire
5.3%inclusion2 decks38 decks
-1%synergy
Duskmantle, House of Shadow
5.3%inclusion2 decks38 decks
5%synergy
Urborg, Tomb of Yawgmoth
5.3%inclusion2 decks38 decks
-8%synergy
Drownyard Temple
5.3%inclusion2 decks38 decks
5%synergy
Otawara, Soaring City
5.3%inclusion2 decks38 decks
-14%synergy
Mana Artifacts
Sol Ring
79%inclusion30 decks38 decks
-11%synergy
Arcane Signet
76%inclusion29 decks38 decks
-11%synergy
Azorius Signet
34%inclusion13 decks38 decks
4%synergy
Talisman of Progress
24%inclusion9 decks38 decks
-20%synergy
Talisman of Dominance
24%inclusion9 decks38 decks
-26%synergy
Orzhov Signet
24%inclusion9 decks38 decks
-8%synergy
Talisman of Hierarchy
21%inclusion8 decks38 decks
-23%synergy
Mind Stone
16%inclusion6 decks38 decks
4%synergy
Dimir Signet
13%inclusion5 decks38 decks
-17%synergy
Commander's Sphere
11%inclusion4 decks38 decks
-7%synergy
Chromatic Lantern
7.9%inclusion3 decks38 decks
-5%synergy
Lands
Swamp
97%inclusion37 decks38 decks
6%synergy
Island
97%inclusion37 decks38 decks
4%synergy
Plains
97%inclusion37 decks38 decks
5%synergy
Command Tower
95%inclusion36 decks38 decks
2%synergy
Arcane Sanctum
71%inclusion27 decks38 decks
17%synergy
Valgavoth's Lair
55%inclusion21 decks38 decks
53%synergy
Caves of Koilos
53%inclusion20 decks38 decks
17%synergy
Sunken Hollow
53%inclusion20 decks38 decks
13%synergy
Glacial Fortress
50%inclusion19 decks38 decks
7%synergy
Prairie Stream
50%inclusion19 decks38 decks
9%synergy
Exotic Orchard
47%inclusion18 decks38 decks
-11%synergy
Adarkar Wastes
47%inclusion18 decks38 decks
15%synergy
Obscura Storefront
45%inclusion17 decks38 decks
35%synergy
Azorius Chancery
42%inclusion16 decks38 decks
29%synergy
Temple of Deceit
42%inclusion16 decks38 decks
25%synergy
Underground River
42%inclusion16 decks38 decks
7%synergy
Isolated Chapel
42%inclusion16 decks38 decks
1%synergy
Temple of Enlightenment
39%inclusion15 decks38 decks
24%synergy
Temple of Silence
39%inclusion15 decks38 decks
21%synergy
Contaminated Landscape
37%inclusion14 decks38 decks
23%synergy
Dimir Aqueduct
37%inclusion14 decks38 decks
24%synergy
Orzhov Basilica
37%inclusion14 decks38 decks
22%synergy
Drowned Catacomb
37%inclusion14 decks38 decks
-1%synergy
Hallowed Fountain
37%inclusion14 decks38 decks
-14%synergy
Raffine's Tower
34%inclusion13 decks38 decks
-7%synergy
Evolving Wilds
34%inclusion13 decks38 decks
10%synergy
Godless Shrine
32%inclusion12 decks38 decks
-20%synergy
Darkwater Catacombs
26%inclusion10 decks38 decks
12%synergy
Watery Grave
26%inclusion10 decks38 decks
-25%synergy
Terramorphic Expanse
24%inclusion9 decks38 decks
8%synergy
Flooded Strand
21%inclusion8 decks38 decks
-17%synergy
Vault of Champions
21%inclusion8 decks38 decks
-11%synergy
Shipwreck Marsh
18%inclusion7 decks38 decks
-2%synergy
Skycloud Expanse
18%inclusion7 decks38 decks
3%synergy
Meticulous Archive
18%inclusion7 decks38 decks
4%synergy
Marsh Flats
18%inclusion7 decks38 decks
-18%synergy
Abandoned Campground
16%inclusion6 decks38 decks
15%synergy
Tainted Field
16%inclusion6 decks38 decks
9%synergy
Murky Sewer
16%inclusion6 decks38 decks
15%synergy
Neglected Manor
16%inclusion6 decks38 decks
15%synergy
Polluted Delta
16%inclusion6 decks38 decks
-22%synergy
Tainted Isle
13%inclusion5 decks38 decks
7%synergy
Undercity Sewers
13%inclusion5 decks38 decks
-2%synergy
Port Town
13%inclusion5 decks38 decks
-4%synergy
Shadowy Backstreet
13%inclusion5 decks38 decks
1%synergy
Myriad Landscape
13%inclusion5 decks38 decks
5%synergy
Ash Barrens
13%inclusion5 decks38 decks
2%synergy
Thriving Moor
13%inclusion5 decks38 decks
9%synergy
Floodfarm Verge
13%inclusion5 decks38 decks
2%synergy
Path of Ancestry
13%inclusion5 decks38 decks
-15%synergy
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