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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Mesa Enchantress
73%inclusion27 decks37 decks
64%synergy
Inquisitive Glimmer
70%inclusion26 decks37 decks
63%synergy
Scrabbling Skullcrab
59%inclusion22 decks37 decks
58%synergy
Starfield Mystic
62%inclusion23 decks37 decks
56%synergy
Demon of Fate's Design
59%inclusion22 decks37 decks
54%synergy
Doomwake Giant
59%inclusion22 decks37 decks
54%synergy
Sigil of the Empty Throne
57%inclusion21 decks37 decks
51%synergy
Gravebreaker Lamia
51%inclusion19 decks37 decks
50%synergy
Cemetery Tampering
49%inclusion18 decks37 decks
48%synergy
Fear of Sleep Paralysis
51%inclusion19 decks37 decks
46%synergy
Top Cards
Entity Tracker
49%inclusion18 decks37 decks
42%synergy
Seal of Cleansing
43%inclusion16 decks37 decks
42%synergy
Defiled Crypt // Cadaver Lab
43%inclusion16 decks37 decks
42%synergy
Victor, Valgavoth's Seneschal
41%inclusion15 decks37 decks
38%synergy
Redress Fate
41%inclusion15 decks37 decks
35%synergy
Ondu Spiritdancer
38%inclusion14 decks37 decks
32%synergy
Fear of Impostors
38%inclusion14 decks37 decks
36%synergy
Ghostly Dancers
38%inclusion14 decks37 decks
35%synergy
Grasp of Fate
35%inclusion13 decks37 decks
29%synergy
Time Wipe
35%inclusion13 decks37 decks
28%synergy
Creatures
Sage of Mysteries
35%inclusion13 decks37 decks
35%synergy
Soaring Lightbringer
35%inclusion13 decks37 decks
30%synergy
Skullsnap Nuisance
32%inclusion12 decks37 decks
32%synergy
Fear of Infinity
30%inclusion11 decks37 decks
29%synergy
Moon-Blessed Cleric
30%inclusion11 decks37 decks
25%synergy
Aminatou, Veil Piercer
30%inclusion11 decks37 decks
28%synergy
Archon of Sun's Grace
27%inclusion10 decks37 decks
22%synergy
Alseid of Life's Bounty
27%inclusion10 decks37 decks
26%synergy
Silent Hallcreeper
24%inclusion9 decks37 decks
20%synergy
Mindwrack Harpy
24%inclusion9 decks37 decks
24%synergy
Balemurk Leech
22%inclusion8 decks37 decks
21%synergy
Archetype of Imagination
22%inclusion8 decks37 decks
17%synergy
Heliod, the Radiant Dawn
22%inclusion8 decks37 decks
18%synergy
Zur the Enchanter
22%inclusion8 decks37 decks
16%synergy
Athreos, Shroud-Veiled
19%inclusion7 decks37 decks
15%synergy
Millikin
19%inclusion7 decks37 decks
18%synergy
Grim Guardian
19%inclusion7 decks37 decks
16%synergy
Fear of Surveillance
19%inclusion7 decks37 decks
19%synergy
Overlord of the Floodpits
16%inclusion6 decks37 decks
12%synergy
Solemn Simulacrum
16%inclusion6 decks37 decks
1%synergy
Fear of Lost Teeth
16%inclusion6 decks37 decks
16%synergy
Appendage Amalgam
16%inclusion6 decks37 decks
16%synergy
Auramancer
16%inclusion6 decks37 decks
13%synergy
Fear of Isolation
16%inclusion6 decks37 decks
16%synergy
Ashiok's Reaper
14%inclusion5 decks37 decks
13%synergy
Gremlin Tamer
14%inclusion5 decks37 decks
12%synergy
Nightmare Shepherd
14%inclusion5 decks37 decks
11%synergy
Starnheim Courser
14%inclusion5 decks37 decks
10%synergy
Spirited Companion
14%inclusion5 decks37 decks
12%synergy
Dream Eater
11%inclusion4 decks37 decks
10%synergy
Prognostic Sphinx
11%inclusion4 decks37 decks
10%synergy
Stitcher's Supplier
11%inclusion4 decks37 decks
10%synergy
Sun Titan
11%inclusion4 decks37 decks
2%synergy
Nighthowler
11%inclusion4 decks37 decks
10%synergy
Indebted Spirit
11%inclusion4 decks37 decks
11%synergy
The Mindskinner
8.1%inclusion3 decks37 decks
7%synergy
Brain Maggot
8.1%inclusion3 decks37 decks
8%synergy
Arvinox, the Mind Flail
8.1%inclusion3 decks37 decks
6%synergy
Ancient Cellarspawn
8.1%inclusion3 decks37 decks
5%synergy
Fear of Falling
8.1%inclusion3 decks37 decks
8%synergy
Burnished Hart
8.1%inclusion3 decks37 decks
5%synergy
Fear of the Dark
8.1%inclusion3 decks37 decks
8%synergy
Ajani's Chosen
8.1%inclusion3 decks37 decks
7%synergy
Deranged Assistant
8.1%inclusion3 decks37 decks
8%synergy
Phenomenon Investigators
8.1%inclusion3 decks37 decks
8%synergy
Zur, Eternal Schemer
8.1%inclusion3 decks37 decks
5%synergy
Fear of Immobility
8.1%inclusion3 decks37 decks
8%synergy
Devoted Grafkeeper
8.1%inclusion3 decks37 decks
8%synergy
Nashi, Searcher in the Dark
8.1%inclusion3 decks37 decks
8%synergy
Summon: Primal Garuda
7.1%inclusion1 decks14 decks
7%synergy
Instants
Swords to Plowshares
35%inclusion13 decks37 decks
-33%synergy
Otherworldly Gaze
30%inclusion11 decks37 decks
28%synergy
Fact or Fiction
27%inclusion10 decks37 decks
23%synergy
Path to Exile
27%inclusion10 decks37 decks
-15%synergy
Thirst for Meaning
27%inclusion10 decks37 decks
26%synergy
Negate
24%inclusion9 decks37 decks
8%synergy
Void Rend
22%inclusion8 decks37 decks
-12%synergy
Arcane Denial
19%inclusion7 decks37 decks
-1%synergy
Utter End
14%inclusion5 decks37 decks
7%synergy
Rowan's Grim Search
14%inclusion5 decks37 decks
13%synergy
Unwanted Remake
11%inclusion4 decks37 decks
10%synergy
Frantic Search
11%inclusion4 decks37 decks
-6%synergy
An Offer You Can't Refuse
11%inclusion4 decks37 decks
-16%synergy
Return to Dust
11%inclusion4 decks37 decks
7%synergy
Brainstorm
11%inclusion4 decks37 decks
-6%synergy
Telling Time
8.1%inclusion3 decks37 decks
6%synergy
Thought Scour
8.1%inclusion3 decks37 decks
7%synergy
Counterspell
8.1%inclusion3 decks37 decks
-33%synergy
Inkshield
8.1%inclusion3 decks37 decks
-1%synergy
Forbidden Alchemy
8.1%inclusion3 decks37 decks
7%synergy
Dreams of Laguna
7.1%inclusion1 decks14 decks
7%synergy
Riverwalk Technique
6.3%inclusion1 decks16 decks
6%synergy
Refute
5.9%inclusion2 decks34 decks
3%synergy
Defabricate
5.4%inclusion2 decks37 decks
5%synergy
Jump Scare
5.4%inclusion2 decks37 decks
5%synergy
Murder
5.4%inclusion2 decks37 decks
4%synergy
Argivian Find
5.4%inclusion2 decks37 decks
5%synergy
Live or Die
5.4%inclusion2 decks37 decks
5%synergy
Final Payment
5.4%inclusion2 decks37 decks
5%synergy
Generous Gift
5.4%inclusion2 decks37 decks
-9%synergy
Seized from Slumber
5.4%inclusion2 decks37 decks
5%synergy
Sinister Sabotage
5.4%inclusion2 decks37 decks
5%synergy
Glimmerburst
5.4%inclusion2 decks37 decks
5%synergy
Sorceries
Sevinne's Reclamation
32%inclusion12 decks37 decks
24%synergy
Singularity Rupture
25%inclusion3 decks12 decks
23%synergy
Extinguish All Hope
24%inclusion9 decks37 decks
23%synergy
Dance of the Manse
19%inclusion7 decks37 decks
15%synergy
Space-Time Anomaly
17%inclusion2 decks12 decks
15%synergy
Resurgent Belief
16%inclusion6 decks37 decks
14%synergy
Read the Bones
14%inclusion5 decks37 decks
9%synergy
Open the Vaults
14%inclusion5 decks37 decks
12%synergy
Final Vengeance
14%inclusion5 decks37 decks
13%synergy
Brilliant Restoration
14%inclusion5 decks37 decks
12%synergy
Damn
11%inclusion4 decks37 decks
-10%synergy
Inspiration from Beyond
8.8%inclusion3 decks34 decks
9%synergy
Commune with Evil
8.1%inclusion3 decks37 decks
8%synergy
Fascination
8.1%inclusion3 decks37 decks
8%synergy
Night's Whisper
8.1%inclusion3 decks37 decks
6%synergy
Entreat the Angels
8.1%inclusion3 decks37 decks
6%synergy
Aminatou's Augury
8.1%inclusion3 decks37 decks
7%synergy
Austere Command
8.1%inclusion3 decks37 decks
-1%synergy
Terminus
8.1%inclusion3 decks37 decks
4%synergy
Cleansing Meditation
8.1%inclusion3 decks37 decks
8%synergy
Diabolic Vision
8.1%inclusion3 decks37 decks
6%synergy
Winternight Stories
6.3%inclusion1 decks16 decks
5%synergy
Unending Whisper
6.3%inclusion1 decks16 decks
6%synergy
Portent
5.4%inclusion2 decks37 decks
2%synergy
Compulsive Research
5.4%inclusion2 decks37 decks
5%synergy
Deep Analysis
5.4%inclusion2 decks37 decks
4%synergy
Painful Truths
5.4%inclusion2 decks37 decks
3%synergy
Hour of Revelation
5.4%inclusion2 decks37 decks
5%synergy
Legions to Ashes
5.4%inclusion2 decks37 decks
5%synergy
Notion Rain
5.4%inclusion2 decks37 decks
5%synergy
Ponder
5.4%inclusion2 decks37 decks
-4%synergy
Windfall
5.4%inclusion2 decks37 decks
-8%synergy
Unmarked Grave
5.4%inclusion2 decks37 decks
4%synergy
Feed the Swarm
5.4%inclusion2 decks37 decks
3%synergy
Buried Alive
5.4%inclusion2 decks37 decks
1%synergy
Breakthrough
5.4%inclusion2 decks37 decks
5%synergy
Utility Artifacts
Wayfarer's Bauble
19%inclusion7 decks37 decks
11%synergy
Perpetual Timepiece
16%inclusion6 decks37 decks
16%synergy
Brainstone
8.1%inclusion3 decks37 decks
7%synergy
The Water Crystal
7.7%inclusion1 decks13 decks
6%synergy
The Everflowing Well
5.4%inclusion2 decks37 decks
5%synergy
Key to the City
5.4%inclusion2 decks37 decks
4%synergy
Enchantments
The Eldest Reborn
35%inclusion13 decks37 decks
33%synergy
Mirrormade
35%inclusion13 decks37 decks
25%synergy
Seal of Doom
32%inclusion12 decks37 decks
32%synergy
Secrets of the Dead
32%inclusion12 decks37 decks
32%synergy
Bottomless Pool // Locker Room
32%inclusion12 decks37 decks
30%synergy
Cacophony Unleashed
32%inclusion12 decks37 decks
31%synergy
Ethereal Armor
32%inclusion12 decks37 decks
28%synergy
Estrid's Invocation
32%inclusion12 decks37 decks
28%synergy
Dress Down
32%inclusion12 decks37 decks
30%synergy
Seal of Removal
32%inclusion12 decks37 decks
32%synergy
Stillness in Motion
31%inclusion5 decks16 decks
31%synergy
Shark Typhoon
30%inclusion11 decks37 decks
24%synergy
Sphere of Safety
30%inclusion11 decks37 decks
20%synergy
Imprisoned in the Moon
30%inclusion11 decks37 decks
23%synergy
Unable to Scream
27%inclusion10 decks37 decks
26%synergy
Secret Arcade // Dusty Parlor
27%inclusion10 decks37 decks
22%synergy
All That Glitters
27%inclusion10 decks37 decks
18%synergy
The Tale of Tamiyo
24%inclusion9 decks37 decks
24%synergy
Ballad of the Black Flag
22%inclusion8 decks37 decks
21%synergy
Propaganda
22%inclusion8 decks37 decks
-5%synergy
Ripples of Undeath
22%inclusion8 decks37 decks
19%synergy
Timely Ward
22%inclusion8 decks37 decks
17%synergy
Derelict Attic // Widow's Walk
22%inclusion8 decks37 decks
21%synergy
Restricted Office // Lecture Hall
22%inclusion8 decks37 decks
19%synergy
Extravagant Replication
19%inclusion7 decks37 decks
14%synergy
Meat Locker // Drowned Diner
19%inclusion7 decks37 decks
18%synergy
Monologue Tax
19%inclusion7 decks37 decks
13%synergy
Cramped Vents // Access Maze
19%inclusion7 decks37 decks
16%synergy
Copy Enchantment
19%inclusion7 decks37 decks
14%synergy
Cast Out
19%inclusion7 decks37 decks
16%synergy
One with the Multiverse
19%inclusion7 decks37 decks
14%synergy
Spirit-Sister's Call
16%inclusion6 decks37 decks
15%synergy
The Restoration of Eiganjo
16%inclusion6 decks37 decks
16%synergy
Polluted Cistern // Dim Oubliette
16%inclusion6 decks37 decks
16%synergy
Trapped in the Screen
14%inclusion5 decks37 decks
13%synergy
King Narfi's Betrayal
14%inclusion5 decks37 decks
13%synergy
Curse of Silence
14%inclusion5 decks37 decks
13%synergy
Amphibian Downpour
14%inclusion5 decks37 decks
9%synergy
Ghostly Prison
14%inclusion5 decks37 decks
-8%synergy
Surgical Suite // Hospital Room
14%inclusion5 decks37 decks
13%synergy
The Bath Song
14%inclusion5 decks37 decks
13%synergy
Phyrexian Arena
14%inclusion5 decks37 decks
0%synergy
Glasswing Grace
11%inclusion4 decks37 decks
8%synergy
Shardmage's Rescue
11%inclusion4 decks37 decks
10%synergy
Hopeless Nightmare
11%inclusion4 decks37 decks
11%synergy
Genesis of the Daleks
11%inclusion4 decks37 decks
11%synergy
Fraying Sanity
11%inclusion4 decks37 decks
10%synergy
Nowhere to Run
11%inclusion4 decks37 decks
10%synergy
Soul Snare
11%inclusion4 decks37 decks
10%synergy
Vessel of Paramnesia
11%inclusion4 decks37 decks
11%synergy
Battles
Invasion of Theros
11%inclusion4 decks37 decks
9%synergy
Utility Lands
Bojuka Bog
38%inclusion14 decks37 decks
11%synergy
Hall of Heliod's Generosity
30%inclusion11 decks37 decks
17%synergy
Halimar Depths
16%inclusion6 decks37 decks
11%synergy
Nephalia Drownyard
8.1%inclusion3 decks37 decks
8%synergy
Dakmor Salvage
5.4%inclusion2 decks37 decks
5%synergy
Secluded Steppe
5.4%inclusion2 decks37 decks
4%synergy
Barren Moor
5.4%inclusion2 decks37 decks
4%synergy
Drownyard Temple
5.4%inclusion2 decks37 decks
5%synergy
Mana Artifacts
Arcane Signet
76%inclusion28 decks37 decks
-12%synergy
Sol Ring
73%inclusion27 decks37 decks
-17%synergy
Azorius Signet
62%inclusion23 decks37 decks
30%synergy
Orzhov Signet
59%inclusion22 decks37 decks
25%synergy
Dimir Signet
51%inclusion19 decks37 decks
19%synergy
Mind Stone
32%inclusion12 decks37 decks
20%synergy
Talisman of Progress
32%inclusion12 decks37 decks
-11%synergy
Talisman of Dominance
32%inclusion12 decks37 decks
-17%synergy
Commander's Sphere
30%inclusion11 decks37 decks
11%synergy
Talisman of Hierarchy
24%inclusion9 decks37 decks
-19%synergy
Fellwar Stone
22%inclusion8 decks37 decks
-12%synergy
Obelisk of Esper
11%inclusion4 decks37 decks
9%synergy
Lands
Island
100%inclusion37 decks37 decks
7%synergy
Plains
100%inclusion37 decks37 decks
9%synergy
Swamp
100%inclusion37 decks37 decks
9%synergy
Command Tower
86%inclusion32 decks37 decks
-6%synergy
Arcane Sanctum
70%inclusion26 decks37 decks
16%synergy
Terramorphic Expanse
59%inclusion22 decks37 decks
43%synergy
Prairie Stream
51%inclusion19 decks37 decks
11%synergy
Evolving Wilds
51%inclusion19 decks37 decks
26%synergy
Exotic Orchard
49%inclusion18 decks37 decks
-10%synergy
Dimir Aqueduct
49%inclusion18 decks37 decks
35%synergy
Temple of Enlightenment
49%inclusion18 decks37 decks
32%synergy
Contaminated Landscape
49%inclusion18 decks37 decks
34%synergy
Obscura Storefront
46%inclusion17 decks37 decks
36%synergy
Caves of Koilos
43%inclusion16 decks37 decks
8%synergy
Temple of Deceit
43%inclusion16 decks37 decks
25%synergy
Temple of Silence
43%inclusion16 decks37 decks
24%synergy
Azorius Chancery
41%inclusion15 decks37 decks
26%synergy
Tainted Field
41%inclusion15 decks37 decks
34%synergy
Orzhov Basilica
41%inclusion15 decks37 decks
25%synergy
Tainted Isle
41%inclusion15 decks37 decks
34%synergy
Glacial Fortress
38%inclusion14 decks37 decks
-2%synergy
Adarkar Wastes
35%inclusion13 decks37 decks
4%synergy
Sunken Hollow
32%inclusion12 decks37 decks
-7%synergy
Isolated Chapel
30%inclusion11 decks37 decks
-9%synergy
Shineshadow Snarl
27%inclusion10 decks37 decks
17%synergy
Ash Barrens
24%inclusion9 decks37 decks
14%synergy
Underground River
24%inclusion9 decks37 decks
-9%synergy
Choked Estuary
24%inclusion9 decks37 decks
8%synergy
Irrigated Farmland
22%inclusion8 decks37 decks
14%synergy
Thriving Isle
19%inclusion7 decks37 decks
14%synergy
Drowned Catacomb
19%inclusion7 decks37 decks
-17%synergy
Thriving Moor
19%inclusion7 decks37 decks
15%synergy
Fetid Pools
16%inclusion6 decks37 decks
9%synergy
Thriving Heath
16%inclusion6 decks37 decks
12%synergy
Darkwater Catacombs
16%inclusion6 decks37 decks
2%synergy
Tranquil Cove
16%inclusion6 decks37 decks
10%synergy
Myriad Landscape
16%inclusion6 decks37 decks
8%synergy
Port Town
16%inclusion6 decks37 decks
-1%synergy
Skycloud Expanse
16%inclusion6 decks37 decks
1%synergy
Valgavoth's Lair
14%inclusion5 decks37 decks
11%synergy
Path of Ancestry
14%inclusion5 decks37 decks
-14%synergy
Glasswing Grace
11%inclusion4 decks37 decks
8%synergy
Escape Tunnel
11%inclusion4 decks37 decks
10%synergy
Sunlit Marsh
11%inclusion4 decks37 decks
7%synergy
Scoured Barrens
11%inclusion4 decks37 decks
4%synergy
Desolate Mire
8.1%inclusion3 decks37 decks
2%synergy
Contaminated Aquifer
8.1%inclusion3 decks37 decks
4%synergy
Floodfarm Verge
8.1%inclusion3 decks37 decks
-3%synergy
Submerged Boneyard
8.1%inclusion3 decks37 decks
7%synergy
Fetid Heath
5.4%inclusion2 decks37 decks
-6%synergy
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