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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Utility Lands
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Retro-Mutation
17%inclusion1 decks6 decks
16%synergy
Dimensional Exile
14%inclusion1 decks7 decks
14%synergy
Noggle the Mind
9.1%inclusion1 decks11 decks
8%synergy
High Synergy Cards
Inquisitive Glimmer
78%inclusion31 decks40 decks
70%synergy
Scrabbling Skullcrab
60%inclusion24 decks40 decks
59%synergy
Mesa Enchantress
65%inclusion26 decks40 decks
56%synergy
Cemetery Tampering
55%inclusion22 decks40 decks
54%synergy
Gravebreaker Lamia
50%inclusion20 decks40 decks
49%synergy
Defiled Crypt // Cadaver Lab
48%inclusion19 decks40 decks
47%synergy
Starfield Mystic
53%inclusion21 decks40 decks
46%synergy
Stillness in Motion
46%inclusion11 decks24 decks
45%synergy
Demon of Fate's Design
50%inclusion20 decks40 decks
45%synergy
Sigil of the Empty Throne
50%inclusion20 decks40 decks
44%synergy
Top Cards
Doomwake Giant
48%inclusion19 decks40 decks
42%synergy
Entity Tracker
45%inclusion18 decks40 decks
39%synergy
Victor, Valgavoth's Seneschal
45%inclusion18 decks40 decks
43%synergy
Fear of Sleep Paralysis
45%inclusion18 decks40 decks
40%synergy
Fear of Impostors
43%inclusion17 decks40 decks
41%synergy
Seal of Cleansing
43%inclusion17 decks40 decks
41%synergy
Unable to Scream
40%inclusion16 decks40 decks
39%synergy
Ghostly Dancers
40%inclusion16 decks40 decks
37%synergy
Skullsnap Nuisance
38%inclusion15 decks40 decks
37%synergy
Singularity Rupture
37%inclusion7 decks19 decks
35%synergy
Creatures
Sage of Mysteries
35%inclusion14 decks40 decks
35%synergy
Soaring Lightbringer
35%inclusion14 decks40 decks
30%synergy
Moon-Blessed Cleric
30%inclusion12 decks40 decks
25%synergy
Alseid of Life's Bounty
30%inclusion12 decks40 decks
29%synergy
Mindwrack Harpy
28%inclusion11 decks40 decks
27%synergy
Fear of Surveillance
25%inclusion10 decks40 decks
25%synergy
Ondu Spiritdancer
25%inclusion10 decks40 decks
19%synergy
Fear of Infinity
25%inclusion10 decks40 decks
24%synergy
Balemurk Leech
25%inclusion10 decks40 decks
24%synergy
Aminatou, Veil Piercer
25%inclusion10 decks40 decks
24%synergy
Archon of Sun's Grace
23%inclusion9 decks40 decks
18%synergy
Silent Hallcreeper
23%inclusion9 decks40 decks
18%synergy
Zur the Enchanter
23%inclusion9 decks40 decks
17%synergy
Millikin
23%inclusion9 decks40 decks
22%synergy
Appendage Amalgam
20%inclusion8 decks40 decks
20%synergy
Grim Guardian
20%inclusion8 decks40 decks
17%synergy
Heliod, the Radiant Dawn
20%inclusion8 decks40 decks
16%synergy
Gremlin Tamer
20%inclusion8 decks40 decks
19%synergy
Archetype of Imagination
18%inclusion7 decks40 decks
13%synergy
Starnheim Courser
18%inclusion7 decks40 decks
14%synergy
Fear of Isolation
18%inclusion7 decks40 decks
17%synergy
Fear of Lost Teeth
18%inclusion7 decks40 decks
17%synergy
Nashi, Searcher in the Dark
15%inclusion6 decks40 decks
14%synergy
Spirited Companion
15%inclusion6 decks40 decks
13%synergy
Creeping Peeper
15%inclusion6 decks40 decks
15%synergy
Auramancer
15%inclusion6 decks40 decks
12%synergy
Summon: Primal Odin
14%inclusion3 decks22 decks
9%synergy
Summon: Yojimbo
14%inclusion3 decks22 decks
13%synergy
Nighthowler
13%inclusion5 decks40 decks
12%synergy
Stitcher's Supplier
13%inclusion5 decks40 decks
12%synergy
Ashiok's Reaper
13%inclusion5 decks40 decks
12%synergy
Overlord of the Floodpits
13%inclusion5 decks40 decks
9%synergy
Solemn Simulacrum
10%inclusion4 decks40 decks
-4%synergy
The Mindskinner
10%inclusion4 decks40 decks
9%synergy
Athreos, Shroud-Veiled
10%inclusion4 decks40 decks
6%synergy
Deranged Assistant
10%inclusion4 decks40 decks
10%synergy
Zur, Eternal Schemer
10%inclusion4 decks40 decks
7%synergy
Optimistic Scavenger
10%inclusion4 decks40 decks
10%synergy
Ajani's Chosen
10%inclusion4 decks40 decks
9%synergy
Callaphe, Beloved of the Sea
10%inclusion4 decks40 decks
9%synergy
Fear of the Dark
10%inclusion4 decks40 decks
10%synergy
Fear of Falling
7.5%inclusion3 decks40 decks
7%synergy
Stenn, Paranoid Partisan
7.5%inclusion3 decks40 decks
6%synergy
Sun Titan
7.5%inclusion3 decks40 decks
-1%synergy
River Kelpie
7.5%inclusion3 decks40 decks
7%synergy
Fear of Immobility
7.5%inclusion3 decks40 decks
7%synergy
Fear of Failed Tests
7.5%inclusion3 decks40 decks
7%synergy
Spectral Snatcher
7.5%inclusion3 decks40 decks
7%synergy
Brain Maggot
7.5%inclusion3 decks40 decks
7%synergy
The Ancient One
7.5%inclusion3 decks40 decks
7%synergy
Instants
Negate
30%inclusion12 decks40 decks
14%synergy
Fact or Fiction
30%inclusion12 decks40 decks
26%synergy
Thirst for Meaning
28%inclusion11 decks40 decks
26%synergy
Swords to Plowshares
25%inclusion10 decks40 decks
-43%synergy
Path to Exile
25%inclusion10 decks40 decks
-17%synergy
Otherworldly Gaze
25%inclusion10 decks40 decks
23%synergy
Void Rend
23%inclusion9 decks40 decks
-12%synergy
Frantic Search
15%inclusion6 decks40 decks
-3%synergy
Rowan's Grim Search
15%inclusion6 decks40 decks
15%synergy
Refute
14%inclusion5 decks37 decks
11%synergy
Arcane Denial
13%inclusion5 decks40 decks
-8%synergy
Drown in the Loch
10%inclusion4 decks40 decks
8%synergy
Utter End
10%inclusion4 decks40 decks
3%synergy
Forbidden Alchemy
10%inclusion4 decks40 decks
9%synergy
Dreams of Laguna
10%inclusion2 decks21 decks
9%synergy
An Offer You Can't Refuse
7.5%inclusion3 decks40 decks
-20%synergy
Jump Scare
7.5%inclusion3 decks40 decks
7%synergy
Get Out
7.5%inclusion3 decks40 decks
7%synergy
Counterspell
7.5%inclusion3 decks40 decks
-34%synergy
Thought Scour
7.5%inclusion3 decks40 decks
6%synergy
Unwanted Remake
7.5%inclusion3 decks40 decks
7%synergy
Sinister Sabotage
7.5%inclusion3 decks40 decks
7%synergy
Return to Dust
5.0%inclusion2 decks40 decks
1%synergy
Brainstorm
5.0%inclusion2 decks40 decks
-12%synergy
Seized from Slumber
5.0%inclusion2 decks40 decks
5%synergy
Drown in Dreams
5.0%inclusion2 decks40 decks
5%synergy
Live or Die
5.0%inclusion2 decks40 decks
5%synergy
Final Payment
5.0%inclusion2 decks40 decks
5%synergy
Murder
5.0%inclusion2 decks40 decks
3%synergy
Disenchant
5.0%inclusion2 decks40 decks
3%synergy
Don't Make a Sound
5.0%inclusion2 decks40 decks
5%synergy
Swallowed by Leviathan
5.0%inclusion1 decks20 decks
4%synergy
Fading Hope
5.0%inclusion2 decks40 decks
5%synergy
Aetherize
5.0%inclusion2 decks40 decks
1%synergy
Break the Spell
5.0%inclusion2 decks40 decks
5%synergy
Despark
5.0%inclusion2 decks40 decks
-11%synergy
Into the Story
5.0%inclusion2 decks40 decks
3%synergy
Mortify
5.0%inclusion2 decks40 decks
-4%synergy
Generous Gift
5.0%inclusion2 decks40 decks
-9%synergy
Sorceries
Redress Fate
33%inclusion13 decks40 decks
27%synergy
Time Wipe
28%inclusion11 decks40 decks
21%synergy
Sevinne's Reclamation
25%inclusion10 decks40 decks
16%synergy
Extinguish All Hope
23%inclusion9 decks40 decks
21%synergy
Space-Time Anomaly
21%inclusion4 decks19 decks
19%synergy
Dance of the Manse
15%inclusion6 decks40 decks
12%synergy
Final Vengeance
15%inclusion6 decks40 decks
15%synergy
Open the Vaults
15%inclusion6 decks40 decks
14%synergy
Resurgent Belief
13%inclusion5 decks40 decks
10%synergy
Brilliant Restoration
13%inclusion5 decks40 decks
11%synergy
Night's Whisper
10%inclusion4 decks40 decks
7%synergy
Damn
10%inclusion4 decks40 decks
-10%synergy
Inspiration from Beyond
8.1%inclusion3 decks37 decks
8%synergy
Commune with Evil
7.5%inclusion3 decks40 decks
7%synergy
Painful Truths
7.5%inclusion3 decks40 decks
5%synergy
Read the Bones
7.5%inclusion3 decks40 decks
3%synergy
Windfall
7.5%inclusion3 decks40 decks
-6%synergy
Fascination
7.5%inclusion3 decks40 decks
7%synergy
Compulsive Research
7.5%inclusion3 decks40 decks
7%synergy
Wail of the Forgotten
5.0%inclusion2 decks40 decks
5%synergy
Buried Alive
5.0%inclusion2 decks40 decks
1%synergy
Breakthrough
5.0%inclusion2 decks40 decks
5%synergy
Notion Rain
5.0%inclusion2 decks40 decks
5%synergy
Asinine Antics
5.0%inclusion2 decks40 decks
4%synergy
Terror Tide
5.0%inclusion2 decks40 decks
5%synergy
Merciless Eviction
5.0%inclusion2 decks40 decks
3%synergy
Tome Scour
5.0%inclusion2 decks40 decks
5%synergy
Deep Analysis
5.0%inclusion2 decks40 decks
4%synergy
Hour of Revelation
5.0%inclusion2 decks40 decks
5%synergy
Legions to Ashes
5.0%inclusion2 decks40 decks
4%synergy
Austere Command
5.0%inclusion2 decks40 decks
-4%synergy
Unmarked Grave
5.0%inclusion2 decks40 decks
4%synergy
Cut Your Losses
5.0%inclusion2 decks40 decks
5%synergy
Feed the Swarm
5.0%inclusion2 decks40 decks
2%synergy
Cleansing Meditation
5.0%inclusion2 decks40 decks
5%synergy
Diresight
5.0%inclusion2 decks40 decks
4%synergy
Utility Artifacts
Wayfarer's Bauble
20%inclusion8 decks40 decks
12%synergy
Perpetual Timepiece
18%inclusion7 decks40 decks
17%synergy
Matzalantli, the Great Door
7.5%inclusion3 decks40 decks
5%synergy
The Everflowing Well
7.5%inclusion3 decks40 decks
7%synergy
Key to the City
5.0%inclusion2 decks40 decks
4%synergy
The Water Crystal
5.0%inclusion1 decks20 decks
3%synergy
Cloud Key
5.0%inclusion2 decks40 decks
2%synergy
Keys to the House
5.0%inclusion2 decks40 decks
5%synergy
Swiftfoot Boots
5.0%inclusion2 decks40 decks
-19%synergy
Enchantments
Secrets of the Dead
35%inclusion14 decks40 decks
35%synergy
Imprisoned in the Moon
33%inclusion13 decks40 decks
26%synergy
Seal of Doom
33%inclusion13 decks40 decks
32%synergy
The Tale of Tamiyo
33%inclusion13 decks40 decks
32%synergy
Restricted Office // Lecture Hall
33%inclusion13 decks40 decks
30%synergy
Grasp of Fate
33%inclusion13 decks40 decks
26%synergy
The Eldest Reborn
33%inclusion13 decks40 decks
30%synergy
Seal of Removal
30%inclusion12 decks40 decks
29%synergy
Bottomless Pool // Locker Room
30%inclusion12 decks40 decks
28%synergy
Ethereal Armor
30%inclusion12 decks40 decks
25%synergy
Cacophony Unleashed
28%inclusion11 decks40 decks
26%synergy
Estrid's Invocation
25%inclusion10 decks40 decks
20%synergy
All That Glitters
25%inclusion10 decks40 decks
16%synergy
Secret Arcade // Dusty Parlor
25%inclusion10 decks40 decks
20%synergy
Dress Down
25%inclusion10 decks40 decks
23%synergy
Sphere of Safety
23%inclusion9 decks40 decks
13%synergy
Derelict Attic // Widow's Walk
23%inclusion9 decks40 decks
22%synergy
Shark Typhoon
20%inclusion8 decks40 decks
14%synergy
Cast Out
20%inclusion8 decks40 decks
17%synergy
King Narfi's Betrayal
20%inclusion8 decks40 decks
20%synergy
Mirrormade
20%inclusion8 decks40 decks
10%synergy
Cramped Vents // Access Maze
20%inclusion8 decks40 decks
18%synergy
Meat Locker // Drowned Diner
20%inclusion8 decks40 decks
19%synergy
Ballad of the Black Flag
20%inclusion8 decks40 decks
20%synergy
Ripples of Undeath
18%inclusion7 decks40 decks
15%synergy
Extravagant Replication
18%inclusion7 decks40 decks
12%synergy
Soul Snare
18%inclusion7 decks40 decks
17%synergy
Polluted Cistern // Dim Oubliette
18%inclusion7 decks40 decks
17%synergy
The Restoration of Eiganjo
18%inclusion7 decks40 decks
17%synergy
Propaganda
18%inclusion7 decks40 decks
-10%synergy
Hopeless Nightmare
15%inclusion6 decks40 decks
15%synergy
Vessel of Paramnesia
15%inclusion6 decks40 decks
15%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion6 decks40 decks
15%synergy
Shardmage's Rescue
15%inclusion6 decks40 decks
15%synergy
Surgical Suite // Hospital Room
15%inclusion6 decks40 decks
15%synergy
Trapped in the Screen
13%inclusion5 decks40 decks
12%synergy
Glasswing Grace
13%inclusion5 decks40 decks
10%synergy
Minimus Containment
13%inclusion5 decks40 decks
12%synergy
Elspeth Conquers Death
13%inclusion5 decks40 decks
12%synergy
Timely Ward
13%inclusion5 decks40 decks
7%synergy
Central Elevator // Promising Stairs
13%inclusion5 decks40 decks
12%synergy
Witness Protection
13%inclusion5 decks40 decks
11%synergy
Phyrexian Arena
13%inclusion5 decks40 decks
-2%synergy
One with the Multiverse
10%inclusion4 decks40 decks
5%synergy
Chronic Flooding
10%inclusion4 decks40 decks
10%synergy
Spirit-Sister's Call
10%inclusion4 decks40 decks
9%synergy
Copy Enchantment
10%inclusion4 decks40 decks
5%synergy
Monologue Tax
10%inclusion4 decks40 decks
4%synergy
The Bath Song
10%inclusion4 decks40 decks
10%synergy
Tale of Tinúviel
10%inclusion4 decks40 decks
10%synergy
Battles
Invasion of Theros
13%inclusion5 decks40 decks
11%synergy
Utility Lands
Bojuka Bog
33%inclusion13 decks40 decks
5%synergy
Hall of Heliod's Generosity
18%inclusion7 decks40 decks
4%synergy
Halimar Depths
10%inclusion4 decks40 decks
5%synergy
Nephalia Drownyard
10%inclusion4 decks40 decks
10%synergy
Cephalid Coliseum
7.5%inclusion3 decks40 decks
4%synergy
Rogue's Passage
5.0%inclusion2 decks40 decks
-5%synergy
Barren Moor
5.0%inclusion2 decks40 decks
3%synergy
Secluded Steppe
5.0%inclusion2 decks40 decks
3%synergy
Drownyard Temple
5.0%inclusion2 decks40 decks
5%synergy
Dakmor Salvage
5.0%inclusion2 decks40 decks
5%synergy
Eden, Seat of the Sanctum
5.0%inclusion1 decks20 decks
5%synergy
Mana Artifacts
Arcane Signet
70%inclusion28 decks40 decks
-18%synergy
Sol Ring
60%inclusion24 decks40 decks
-30%synergy
Azorius Signet
55%inclusion22 decks40 decks
24%synergy
Orzhov Signet
53%inclusion21 decks40 decks
20%synergy
Dimir Signet
48%inclusion19 decks40 decks
16%synergy
Talisman of Progress
35%inclusion14 decks40 decks
-9%synergy
Talisman of Dominance
33%inclusion13 decks40 decks
-17%synergy
Commander's Sphere
28%inclusion11 decks40 decks
9%synergy
Mind Stone
28%inclusion11 decks40 decks
15%synergy
Talisman of Hierarchy
25%inclusion10 decks40 decks
-19%synergy
Fellwar Stone
15%inclusion6 decks40 decks
-18%synergy
Obelisk of Esper
7.5%inclusion3 decks40 decks
6%synergy
Everflowing Chalice
5.0%inclusion2 decks40 decks
3%synergy
Lands
Island
100%inclusion40 decks40 decks
7%synergy
Swamp
98%inclusion39 decks40 decks
6%synergy
Plains
98%inclusion39 decks40 decks
6%synergy
Command Tower
83%inclusion33 decks40 decks
-10%synergy
Arcane Sanctum
60%inclusion24 decks40 decks
6%synergy
Terramorphic Expanse
55%inclusion22 decks40 decks
39%synergy
Exotic Orchard
55%inclusion22 decks40 decks
-4%synergy
Temple of Enlightenment
53%inclusion21 decks40 decks
36%synergy
Contaminated Landscape
50%inclusion20 decks40 decks
36%synergy
Evolving Wilds
45%inclusion18 decks40 decks
20%synergy
Prairie Stream
43%inclusion17 decks40 decks
2%synergy
Temple of Silence
43%inclusion17 decks40 decks
24%synergy
Temple of Deceit
40%inclusion16 decks40 decks
22%synergy
Obscura Storefront
40%inclusion16 decks40 decks
30%synergy
Azorius Chancery
35%inclusion14 decks40 decks
21%synergy
Dimir Aqueduct
35%inclusion14 decks40 decks
22%synergy
Glacial Fortress
33%inclusion13 decks40 decks
-9%synergy
Orzhov Basilica
33%inclusion13 decks40 decks
17%synergy
Tainted Isle
30%inclusion12 decks40 decks
24%synergy
Sunken Hollow
30%inclusion12 decks40 decks
-10%synergy
Tainted Field
28%inclusion11 decks40 decks
21%synergy
Caves of Koilos
25%inclusion10 decks40 decks
-11%synergy
Port Town
25%inclusion10 decks40 decks
8%synergy
Isolated Chapel
25%inclusion10 decks40 decks
-15%synergy
Shineshadow Snarl
25%inclusion10 decks40 decks
14%synergy
Choked Estuary
25%inclusion10 decks40 decks
9%synergy
Adarkar Wastes
23%inclusion9 decks40 decks
-9%synergy
Myriad Landscape
20%inclusion8 decks40 decks
12%synergy
Ash Barrens
18%inclusion7 decks40 decks
7%synergy
Tranquil Cove
18%inclusion7 decks40 decks
11%synergy
Skycloud Expanse
18%inclusion7 decks40 decks
3%synergy
Path of Ancestry
18%inclusion7 decks40 decks
-10%synergy
Darkwater Catacombs
18%inclusion7 decks40 decks
3%synergy
Irrigated Farmland
18%inclusion7 decks40 decks
10%synergy
Drowned Catacomb
15%inclusion6 decks40 decks
-22%synergy
Fetid Pools
15%inclusion6 decks40 decks
8%synergy
Glasswing Grace
13%inclusion5 decks40 decks
10%synergy
Valgavoth's Lair
13%inclusion5 decks40 decks
10%synergy
Underground River
13%inclusion5 decks40 decks
-21%synergy
Scoured Barrens
13%inclusion5 decks40 decks
6%synergy
Escape Tunnel
10%inclusion4 decks40 decks
9%synergy
Fetid Heath
10%inclusion4 decks40 decks
-3%synergy
Sunlit Marsh
10%inclusion4 decks40 decks
6%synergy
Esper Panorama
10%inclusion4 decks40 decks
7%synergy
Dismal Backwater
10%inclusion4 decks40 decks
4%synergy
Thriving Moor
10%inclusion4 decks40 decks
6%synergy
Desolate Mire
10%inclusion4 decks40 decks
4%synergy
Thriving Isle
10%inclusion4 decks40 decks
6%synergy
Thriving Heath
10%inclusion4 decks40 decks
6%synergy
Contaminated Aquifer
7.5%inclusion3 decks40 decks
3%synergy
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