The Master of Keys (Commander) - Budget 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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Inquisitive Glimmer
74%inclusion28 decks38 decks
66%synergy
Mesa Enchantress
68%inclusion26 decks38 decks
59%synergy
Scrabbling Skullcrab
58%inclusion22 decks38 decks
57%synergy
Starfield Mystic
61%inclusion23 decks38 decks
54%synergy
Cemetery Tampering
53%inclusion20 decks38 decks
52%synergy
Gravebreaker Lamia
53%inclusion20 decks38 decks
52%synergy
Demon of Fate's Design
55%inclusion21 decks38 decks
50%synergy
Sigil of the Empty Throne
53%inclusion20 decks38 decks
47%synergy
Doomwake Giant
53%inclusion20 decks38 decks
47%synergy
Entity Tracker
50%inclusion19 decks38 decks
44%synergy
Top Cards
Fear of Sleep Paralysis
47%inclusion18 decks38 decks
42%synergy
Defiled Crypt // Cadaver Lab
42%inclusion16 decks38 decks
41%synergy
Seal of Cleansing
42%inclusion16 decks38 decks
41%synergy
Ghostly Dancers
39%inclusion15 decks38 decks
37%synergy
Victor, Valgavoth's Seneschal
37%inclusion14 decks38 decks
35%synergy
Secrets of the Dead
37%inclusion14 decks38 decks
37%synergy
Fear of Impostors
37%inclusion14 decks38 decks
35%synergy
Redress Fate
37%inclusion14 decks38 decks
31%synergy
Soaring Lightbringer
37%inclusion14 decks38 decks
32%synergy
The Eldest Reborn
34%inclusion13 decks38 decks
32%synergy
Creatures
Ondu Spiritdancer
32%inclusion12 decks38 decks
25%synergy
Alseid of Life's Bounty
32%inclusion12 decks38 decks
30%synergy
Sage of Mysteries
32%inclusion12 decks38 decks
31%synergy
Skullsnap Nuisance
32%inclusion12 decks38 decks
31%synergy
Fear of Infinity
29%inclusion11 decks38 decks
28%synergy
Archon of Sun's Grace
26%inclusion10 decks38 decks
22%synergy
Mindwrack Harpy
26%inclusion10 decks38 decks
26%synergy
Moon-Blessed Cleric
26%inclusion10 decks38 decks
22%synergy
Balemurk Leech
24%inclusion9 decks38 decks
23%synergy
Aminatou, Veil Piercer
24%inclusion9 decks38 decks
22%synergy
Silent Hallcreeper
21%inclusion8 decks38 decks
17%synergy
Zur the Enchanter
21%inclusion8 decks38 decks
16%synergy
Grim Guardian
21%inclusion8 decks38 decks
19%synergy
Heliod, the Radiant Dawn
21%inclusion8 decks38 decks
17%synergy
Fear of Isolation
18%inclusion7 decks38 decks
18%synergy
Fear of Surveillance
18%inclusion7 decks38 decks
18%synergy
Fear of Lost Teeth
18%inclusion7 decks38 decks
18%synergy
Gremlin Tamer
18%inclusion7 decks38 decks
17%synergy
Millikin
18%inclusion7 decks38 decks
18%synergy
Starnheim Courser
16%inclusion6 decks38 decks
12%synergy
Archetype of Imagination
16%inclusion6 decks38 decks
11%synergy
Spirited Companion
13%inclusion5 decks38 decks
11%synergy
Appendage Amalgam
13%inclusion5 decks38 decks
13%synergy
Auramancer
13%inclusion5 decks38 decks
10%synergy
Solemn Simulacrum
13%inclusion5 decks38 decks
-1%synergy
Nighthowler
13%inclusion5 decks38 decks
13%synergy
Athreos, Shroud-Veiled
13%inclusion5 decks38 decks
9%synergy
Sun Titan
11%inclusion4 decks38 decks
2%synergy
Indebted Spirit
11%inclusion4 decks38 decks
10%synergy
Ajani's Chosen
11%inclusion4 decks38 decks
10%synergy
Creeping Peeper
11%inclusion4 decks38 decks
10%synergy
Zur, Eternal Schemer
11%inclusion4 decks38 decks
7%synergy
The Mindskinner
11%inclusion4 decks38 decks
10%synergy
Overlord of the Floodpits
11%inclusion4 decks38 decks
7%synergy
Ashiok's Reaper
11%inclusion4 decks38 decks
10%synergy
Stitcher's Supplier
11%inclusion4 decks38 decks
10%synergy
Fear of the Dark
11%inclusion4 decks38 decks
10%synergy
Nashi, Searcher in the Dark
11%inclusion4 decks38 decks
10%synergy
Devoted Grafkeeper
7.9%inclusion3 decks38 decks
8%synergy
Brain Maggot
7.9%inclusion3 decks38 decks
8%synergy
Deranged Assistant
7.9%inclusion3 decks38 decks
8%synergy
Fear of Immobility
7.9%inclusion3 decks38 decks
8%synergy
Fear of Falling
7.9%inclusion3 decks38 decks
8%synergy
Optimistic Scavenger
7.9%inclusion3 decks38 decks
8%synergy
Nightmare Shepherd
7.9%inclusion3 decks38 decks
5%synergy
Transcendent Envoy
7.9%inclusion3 decks38 decks
6%synergy
Patrician Geist
7.9%inclusion3 decks38 decks
8%synergy
Callaphe, Beloved of the Sea
7.9%inclusion3 decks38 decks
7%synergy
Summon: Primal Garuda
6.7%inclusion1 decks15 decks
7%synergy
Siegfried, Famed Swordsman
6.3%inclusion1 decks16 decks
6%synergy
Instants
Swords to Plowshares
29%inclusion11 decks38 decks
-39%synergy
Path to Exile
26%inclusion10 decks38 decks
-16%synergy
Fact or Fiction
26%inclusion10 decks38 decks
23%synergy
Void Rend
24%inclusion9 decks38 decks
-10%synergy
Negate
24%inclusion9 decks38 decks
7%synergy
Thirst for Meaning
21%inclusion8 decks38 decks
20%synergy
Otherworldly Gaze
21%inclusion8 decks38 decks
19%synergy
Arcane Denial
13%inclusion5 decks38 decks
-7%synergy
Rowan's Grim Search
13%inclusion5 decks38 decks
13%synergy
Unwanted Remake
11%inclusion4 decks38 decks
10%synergy
Frantic Search
11%inclusion4 decks38 decks
-7%synergy
An Offer You Can't Refuse
11%inclusion4 decks38 decks
-16%synergy
Refute
8.6%inclusion3 decks35 decks
6%synergy
Get Out
7.9%inclusion3 decks38 decks
8%synergy
Forbidden Alchemy
7.9%inclusion3 decks38 decks
7%synergy
Utter End
7.9%inclusion3 decks38 decks
1%synergy
Jump Scare
7.9%inclusion3 decks38 decks
8%synergy
Thought Scour
7.9%inclusion3 decks38 decks
7%synergy
Counterspell
7.9%inclusion3 decks38 decks
-33%synergy
Dreams of Laguna
6.7%inclusion1 decks15 decks
6%synergy
Riverwalk Technique
5.9%inclusion1 decks17 decks
6%synergy
Drown in the Loch
5.3%inclusion2 decks38 decks
3%synergy
Defabricate
5.3%inclusion2 decks38 decks
5%synergy
Seized from Slumber
5.3%inclusion2 decks38 decks
5%synergy
Aetherize
5.3%inclusion2 decks38 decks
1%synergy
Into the Story
5.3%inclusion2 decks38 decks
4%synergy
Generous Gift
5.3%inclusion2 decks38 decks
-9%synergy
Argivian Find
5.3%inclusion2 decks38 decks
5%synergy
Return to Dust
5.3%inclusion2 decks38 decks
2%synergy
Brainstorm
5.3%inclusion2 decks38 decks
-12%synergy
Murder
5.3%inclusion2 decks38 decks
4%synergy
Sinister Sabotage
5.3%inclusion2 decks38 decks
5%synergy
Despark
5.3%inclusion2 decks38 decks
-11%synergy
Drown in Dreams
5.3%inclusion2 decks38 decks
5%synergy
Live or Die
5.3%inclusion2 decks38 decks
5%synergy
Fading Hope
5.3%inclusion2 decks38 decks
5%synergy
Final Payment
5.3%inclusion2 decks38 decks
5%synergy
Don't Make a Sound
5.3%inclusion2 decks38 decks
5%synergy
Sorceries
Singularity Rupture
33%inclusion4 decks12 decks
31%synergy
Space-Time Anomaly
33%inclusion4 decks12 decks
32%synergy
Time Wipe
29%inclusion11 decks38 decks
22%synergy
Sevinne's Reclamation
26%inclusion10 decks38 decks
17%synergy
Extinguish All Hope
21%inclusion8 decks38 decks
19%synergy
Resurgent Belief
16%inclusion6 decks38 decks
14%synergy
Dance of the Manse
16%inclusion6 decks38 decks
12%synergy
Open the Vaults
13%inclusion5 decks38 decks
12%synergy
Final Vengeance
13%inclusion5 decks38 decks
13%synergy
Brilliant Restoration
13%inclusion5 decks38 decks
11%synergy
Damn
13%inclusion5 decks38 decks
-7%synergy
Inspiration from Beyond
8.6%inclusion3 decks35 decks
8%synergy
Unmarked Grave
7.9%inclusion3 decks38 decks
7%synergy
Fascination
7.9%inclusion3 decks38 decks
8%synergy
Read the Bones
7.9%inclusion3 decks38 decks
4%synergy
Austere Command
7.9%inclusion3 decks38 decks
-1%synergy
Cleansing Meditation
7.9%inclusion3 decks38 decks
8%synergy
Night's Whisper
7.9%inclusion3 decks38 decks
5%synergy
Commune with Evil
7.9%inclusion3 decks38 decks
8%synergy
Unending Whisper
5.6%inclusion1 decks18 decks
5%synergy
Winternight Stories
5.6%inclusion1 decks18 decks
5%synergy
Cut Your Losses
5.3%inclusion2 decks38 decks
5%synergy
Deep Analysis
5.3%inclusion2 decks38 decks
4%synergy
Feed the Swarm
5.3%inclusion2 decks38 decks
2%synergy
Buried Alive
5.3%inclusion2 decks38 decks
1%synergy
Hour of Revelation
5.3%inclusion2 decks38 decks
5%synergy
Compulsive Research
5.3%inclusion2 decks38 decks
5%synergy
Windfall
5.3%inclusion2 decks38 decks
-8%synergy
Merciless Eviction
5.3%inclusion2 decks38 decks
3%synergy
Painful Truths
5.3%inclusion2 decks38 decks
3%synergy
Legions to Ashes
5.3%inclusion2 decks38 decks
5%synergy
Breakthrough
5.3%inclusion2 decks38 decks
5%synergy
Notion Rain
5.3%inclusion2 decks38 decks
5%synergy
Utility Artifacts
Wayfarer's Bauble
18%inclusion7 decks38 decks
10%synergy
Perpetual Timepiece
18%inclusion7 decks38 decks
18%synergy
Cloud Key
7.9%inclusion3 decks38 decks
5%synergy
The Water Crystal
7.1%inclusion1 decks14 decks
5%synergy
The Everflowing Well
5.3%inclusion2 decks38 decks
5%synergy
Key to the City
5.3%inclusion2 decks38 decks
4%synergy
Keys to the House
5.3%inclusion2 decks38 decks
5%synergy
Bident of Thassa
5.3%inclusion2 decks38 decks
-4%synergy
Enchantments
Grasp of Fate
34%inclusion13 decks38 decks
28%synergy
Seal of Doom
34%inclusion13 decks38 decks
34%synergy
Estrid's Invocation
34%inclusion13 decks38 decks
30%synergy
Ethereal Armor
34%inclusion13 decks38 decks
30%synergy
Cacophony Unleashed
34%inclusion13 decks38 decks
32%synergy
Stillness in Motion
33%inclusion6 decks18 decks
33%synergy
Seal of Removal
32%inclusion12 decks38 decks
31%synergy
Imprisoned in the Moon
32%inclusion12 decks38 decks
25%synergy
Unable to Scream
32%inclusion12 decks38 decks
30%synergy
All That Glitters
29%inclusion11 decks38 decks
20%synergy
Dress Down
29%inclusion11 decks38 decks
26%synergy
Bottomless Pool // Locker Room
29%inclusion11 decks38 decks
27%synergy
Mirrormade
29%inclusion11 decks38 decks
19%synergy
The Tale of Tamiyo
26%inclusion10 decks38 decks
26%synergy
Secret Arcade // Dusty Parlor
26%inclusion10 decks38 decks
21%synergy
Shark Typhoon
24%inclusion9 decks38 decks
18%synergy
Restricted Office // Lecture Hall
24%inclusion9 decks38 decks
22%synergy
Sphere of Safety
24%inclusion9 decks38 decks
14%synergy
Ballad of the Black Flag
21%inclusion8 decks38 decks
21%synergy
Derelict Attic // Widow's Walk
21%inclusion8 decks38 decks
21%synergy
Cramped Vents // Access Maze
18%inclusion7 decks38 decks
16%synergy
Propaganda
18%inclusion7 decks38 decks
-9%synergy
Ripples of Undeath
18%inclusion7 decks38 decks
16%synergy
Extravagant Replication
18%inclusion7 decks38 decks
13%synergy
Meat Locker // Drowned Diner
18%inclusion7 decks38 decks
18%synergy
Timely Ward
18%inclusion7 decks38 decks
13%synergy
Cast Out
18%inclusion7 decks38 decks
15%synergy
Copy Enchantment
16%inclusion6 decks38 decks
11%synergy
The Restoration of Eiganjo
16%inclusion6 decks38 decks
15%synergy
King Narfi's Betrayal
16%inclusion6 decks38 decks
16%synergy
Trapped in the Screen
13%inclusion5 decks38 decks
13%synergy
Curse of Silence
13%inclusion5 decks38 decks
13%synergy
Surgical Suite // Hospital Room
13%inclusion5 decks38 decks
13%synergy
Amphibian Downpour
13%inclusion5 decks38 decks
9%synergy
Monologue Tax
13%inclusion5 decks38 decks
7%synergy
Phyrexian Arena
13%inclusion5 decks38 decks
-1%synergy
Vessel of Paramnesia
13%inclusion5 decks38 decks
13%synergy
One with the Multiverse
13%inclusion5 decks38 decks
8%synergy
Shardmage's Rescue
13%inclusion5 decks38 decks
13%synergy
Soul Snare
13%inclusion5 decks38 decks
13%synergy
Hopeless Nightmare
13%inclusion5 decks38 decks
13%synergy
The Bath Song
13%inclusion5 decks38 decks
13%synergy
Polluted Cistern // Dim Oubliette
13%inclusion5 decks38 decks
13%synergy
Glasswing Grace
13%inclusion5 decks38 decks
10%synergy
Elspeth Conquers Death
13%inclusion5 decks38 decks
13%synergy
Spirit-Sister's Call
13%inclusion5 decks38 decks
12%synergy
Ghostly Prison
13%inclusion5 decks38 decks
-9%synergy
Darksteel Mutation
11%inclusion4 decks38 decks
4%synergy
Eel Umbra
11%inclusion4 decks38 decks
10%synergy
Genesis of the Daleks
11%inclusion4 decks38 decks
10%synergy
Battles
Invasion of Theros
13%inclusion5 decks38 decks
11%synergy
Utility Lands
Bojuka Bog
32%inclusion12 decks38 decks
4%synergy
Hall of Heliod's Generosity
21%inclusion8 decks38 decks
8%synergy
Nephalia Drownyard
11%inclusion4 decks38 decks
10%synergy
Halimar Depths
11%inclusion4 decks38 decks
6%synergy
Drownyard Temple
5.3%inclusion2 decks38 decks
5%synergy
Dakmor Salvage
5.3%inclusion2 decks38 decks
5%synergy
Rogue's Passage
5.3%inclusion2 decks38 decks
-4%synergy
Barren Moor
5.3%inclusion2 decks38 decks
3%synergy
Secluded Steppe
5.3%inclusion2 decks38 decks
4%synergy
Mana Artifacts
Arcane Signet
71%inclusion27 decks38 decks
-17%synergy
Sol Ring
68%inclusion26 decks38 decks
-22%synergy
Orzhov Signet
55%inclusion21 decks38 decks
21%synergy
Azorius Signet
55%inclusion21 decks38 decks
23%synergy
Dimir Signet
50%inclusion19 decks38 decks
18%synergy
Talisman of Progress
34%inclusion13 decks38 decks
-9%synergy
Talisman of Dominance
32%inclusion12 decks38 decks
-18%synergy
Commander's Sphere
29%inclusion11 decks38 decks
10%synergy
Mind Stone
29%inclusion11 decks38 decks
16%synergy
Talisman of Hierarchy
26%inclusion10 decks38 decks
-17%synergy
Fellwar Stone
21%inclusion8 decks38 decks
-13%synergy
Obelisk of Esper
11%inclusion4 decks38 decks
9%synergy
Lands
Island
100%inclusion38 decks38 decks
7%synergy
Swamp
97%inclusion37 decks38 decks
6%synergy
Plains
97%inclusion37 decks38 decks
6%synergy
Command Tower
84%inclusion32 decks38 decks
-8%synergy
Arcane Sanctum
66%inclusion25 decks38 decks
11%synergy
Terramorphic Expanse
61%inclusion23 decks38 decks
44%synergy
Evolving Wilds
50%inclusion19 decks38 decks
25%synergy
Exotic Orchard
50%inclusion19 decks38 decks
-9%synergy
Contaminated Landscape
50%inclusion19 decks38 decks
36%synergy
Prairie Stream
47%inclusion18 decks38 decks
7%synergy
Dimir Aqueduct
42%inclusion16 decks38 decks
28%synergy
Temple of Enlightenment
42%inclusion16 decks38 decks
26%synergy
Obscura Storefront
42%inclusion16 decks38 decks
32%synergy
Temple of Deceit
37%inclusion14 decks38 decks
19%synergy
Azorius Chancery
37%inclusion14 decks38 decks
23%synergy
Orzhov Basilica
37%inclusion14 decks38 decks
21%synergy
Tainted Isle
37%inclusion14 decks38 decks
30%synergy
Caves of Koilos
37%inclusion14 decks38 decks
1%synergy
Temple of Silence
37%inclusion14 decks38 decks
17%synergy
Tainted Field
34%inclusion13 decks38 decks
27%synergy
Glacial Fortress
34%inclusion13 decks38 decks
-6%synergy
Sunken Hollow
32%inclusion12 decks38 decks
-8%synergy
Isolated Chapel
29%inclusion11 decks38 decks
-10%synergy
Adarkar Wastes
29%inclusion11 decks38 decks
-2%synergy
Shineshadow Snarl
26%inclusion10 decks38 decks
16%synergy
Choked Estuary
24%inclusion9 decks38 decks
7%synergy
Myriad Landscape
21%inclusion8 decks38 decks
12%synergy
Irrigated Farmland
18%inclusion7 decks38 decks
11%synergy
Path of Ancestry
18%inclusion7 decks38 decks
-9%synergy
Port Town
18%inclusion7 decks38 decks
1%synergy
Ash Barrens
18%inclusion7 decks38 decks
8%synergy
Drowned Catacomb
18%inclusion7 decks38 decks
-18%synergy
Valgavoth's Lair
16%inclusion6 decks38 decks
13%synergy
Fetid Pools
16%inclusion6 decks38 decks
9%synergy
Darkwater Catacombs
16%inclusion6 decks38 decks
1%synergy
Underground River
16%inclusion6 decks38 decks
-17%synergy
Tranquil Cove
16%inclusion6 decks38 decks
9%synergy
Skycloud Expanse
13%inclusion5 decks38 decks
-2%synergy
Thriving Moor
13%inclusion5 decks38 decks
9%synergy
Escape Tunnel
13%inclusion5 decks38 decks
12%synergy
Thriving Isle
13%inclusion5 decks38 decks
9%synergy
Glasswing Grace
13%inclusion5 decks38 decks
10%synergy
Thriving Heath
11%inclusion4 decks38 decks
6%synergy
Scoured Barrens
11%inclusion4 decks38 decks
4%synergy
Sunlit Marsh
11%inclusion4 decks38 decks
6%synergy
Desolate Mire
7.9%inclusion3 decks38 decks
2%synergy
Esper Panorama
7.9%inclusion3 decks38 decks
4%synergy
Contaminated Aquifer
7.9%inclusion3 decks38 decks
4%synergy
Submerged Boneyard
7.9%inclusion3 decks38 decks
7%synergy
Floodfarm Verge
7.9%inclusion3 decks38 decks
-3%synergy
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