The Master of Keys (Commander) - Budget Optimized

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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Enchantments
Battles
Utility Lands
Mana Artifacts
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Secret Arcade // Dusty Parlor
72%inclusion21 decks29 decks
68%synergy
Mesa Enchantress
76%inclusion22 decks29 decks
67%synergy
Ondu Spiritdancer
72%inclusion21 decks29 decks
66%synergy
Mirrormade
72%inclusion21 decks29 decks
63%synergy
Inquisitive Glimmer
69%inclusion20 decks29 decks
62%synergy
Scrabbling Skullcrab
62%inclusion18 decks29 decks
61%synergy
Starfield Mystic
66%inclusion19 decks29 decks
59%synergy
Demon of Fate's Design
62%inclusion18 decks29 decks
57%synergy
Entity Tracker
62%inclusion18 decks29 decks
56%synergy
Gravebreaker Lamia
55%inclusion16 decks29 decks
54%synergy
Top Cards
Swords to Plowshares
62%inclusion18 decks29 decks
-6%synergy
Fear of Impostors
55%inclusion16 decks29 decks
54%synergy
Sphere of Safety
52%inclusion15 decks29 decks
42%synergy
Doomwake Giant
52%inclusion15 decks29 decks
46%synergy
Fear of Sleep Paralysis
52%inclusion15 decks29 decks
47%synergy
Arcane Denial
48%inclusion14 decks29 decks
28%synergy
Ghostly Dancers
48%inclusion14 decks29 decks
46%synergy
Sigil of the Empty Throne
45%inclusion13 decks29 decks
39%synergy
Victor, Valgavoth's Seneschal
45%inclusion13 decks29 decks
43%synergy
Extravagant Replication
45%inclusion13 decks29 decks
40%synergy
Game Changers
Notion Thief
17%inclusion5 decks29 decks
10%synergy
Gifts Ungiven
17%inclusion5 decks29 decks
15%synergy
Farewell
6.9%inclusion2 decks29 decks
-6%synergy
Creatures
Soaring Lightbringer
41%inclusion12 decks29 decks
37%synergy
Gremlin Tamer
41%inclusion12 decks29 decks
40%synergy
Moon-Blessed Cleric
41%inclusion12 decks29 decks
37%synergy
Overlord of the Floodpits
38%inclusion11 decks29 decks
34%synergy
Archetype of Imagination
38%inclusion11 decks29 decks
33%synergy
Aminatou, Veil Piercer
31%inclusion9 decks29 decks
30%synergy
Grim Guardian
31%inclusion9 decks29 decks
29%synergy
Zur the Enchanter
28%inclusion8 decks29 decks
22%synergy
Silent Hallcreeper
28%inclusion8 decks29 decks
23%synergy
Skullsnap Nuisance
28%inclusion8 decks29 decks
27%synergy
Zur, Eternal Schemer
28%inclusion8 decks29 decks
24%synergy
Abdel Adrian, Gorion's Ward
24%inclusion7 decks29 decks
22%synergy
Solemn Simulacrum
24%inclusion7 decks29 decks
10%synergy
Archon of Sun's Grace
21%inclusion6 decks29 decks
16%synergy
Sage of Mysteries
21%inclusion6 decks29 decks
20%synergy
Overlord of the Balemurk
21%inclusion6 decks29 decks
19%synergy
Athreos, Shroud-Veiled
21%inclusion6 decks29 decks
16%synergy
Balemurk Leech
21%inclusion6 decks29 decks
20%synergy
Enduring Curiosity
21%inclusion6 decks29 decks
13%synergy
Heliod, the Radiant Dawn
21%inclusion6 decks29 decks
17%synergy
Phenomenon Investigators
17%inclusion5 decks29 decks
17%synergy
Hedron Crab
17%inclusion5 decks29 decks
17%synergy
Leonin Relic-Warder
17%inclusion5 decks29 decks
17%synergy
Auramancer
17%inclusion5 decks29 decks
14%synergy
Mindwrack Harpy
17%inclusion5 decks29 decks
17%synergy
Nightmare Shepherd
17%inclusion5 decks29 decks
15%synergy
Optimistic Scavenger
14%inclusion4 decks29 decks
13%synergy
Malevolent Hermit
14%inclusion4 decks29 decks
13%synergy
Creeping Peeper
14%inclusion4 decks29 decks
14%synergy
Burnished Hart
14%inclusion4 decks29 decks
11%synergy
Spirited Companion
14%inclusion4 decks29 decks
12%synergy
Laboratory Maniac
14%inclusion4 decks29 decks
11%synergy
Ancient Cellarspawn
14%inclusion4 decks29 decks
11%synergy
Ghostly Pilferer
14%inclusion4 decks29 decks
6%synergy
Fear of Isolation
10%inclusion3 decks29 decks
10%synergy
Protean Thaumaturge
10%inclusion3 decks29 decks
10%synergy
Overlord of the Mistmoors
10%inclusion3 decks29 decks
8%synergy
Warehouse Tabby
10%inclusion3 decks29 decks
10%synergy
Nashi, Searcher in the Dark
10%inclusion3 decks29 decks
10%synergy
Ledger Shredder
10%inclusion3 decks29 decks
2%synergy
Fear of Infinity
10%inclusion3 decks29 decks
10%synergy
Lotho, Corrupt Shirriff
10%inclusion3 decks29 decks
-6%synergy
Verge Rangers
10%inclusion3 decks29 decks
9%synergy
Braids, Arisen Nightmare
10%inclusion3 decks29 decks
9%synergy
Lurrus of the Dream-Den
10%inclusion3 decks29 decks
9%synergy
Hydroelectric Specimen
10%inclusion3 decks29 decks
8%synergy
Underworld Coinsmith
10%inclusion3 decks29 decks
9%synergy
Emet-Selch of the Third Seat
8.3%inclusion2 decks24 decks
-1%synergy
Metamorphosis Fanatic
6.9%inclusion2 decks29 decks
3%synergy
Thassa's Devourer
6.9%inclusion2 decks29 decks
7%synergy
Instants
Counterspell
34%inclusion10 decks29 decks
-7%synergy
Thirst for Meaning
31%inclusion9 decks29 decks
30%synergy
Otherworldly Gaze
31%inclusion9 decks29 decks
29%synergy
Inkshield
31%inclusion9 decks29 decks
21%synergy
Utter End
24%inclusion7 decks29 decks
18%synergy
An Offer You Can't Refuse
21%inclusion6 decks29 decks
-7%synergy
Brainstorm
21%inclusion6 decks29 decks
4%synergy
Frantic Search
17%inclusion5 decks29 decks
-1%synergy
Dovin's Veto
17%inclusion5 decks29 decks
-9%synergy
Path to Exile
17%inclusion5 decks29 decks
-25%synergy
Dark Ritual
17%inclusion5 decks29 decks
-2%synergy
Delay
17%inclusion5 decks29 decks
15%synergy
Muddle the Mixture
14%inclusion4 decks29 decks
10%synergy
Lim-Dûl's Vault
14%inclusion4 decks29 decks
11%synergy
Mana Leak
14%inclusion4 decks29 decks
12%synergy
Telling Time
10%inclusion3 decks29 decks
8%synergy
Dispel
10%inclusion3 decks29 decks
7%synergy
Opt
10%inclusion3 decks29 decks
6%synergy
Get Out
10%inclusion3 decks29 decks
10%synergy
Return to Dust
10%inclusion3 decks29 decks
7%synergy
Negate
10%inclusion3 decks29 decks
-6%synergy
Darkblast
10%inclusion3 decks29 decks
10%synergy
Spell Pierce
10%inclusion3 decks29 decks
8%synergy
Shred Memory
10%inclusion3 decks29 decks
10%synergy
Fact or Fiction
10%inclusion3 decks29 decks
7%synergy
No More Lies
10%inclusion3 decks29 decks
9%synergy
Retraction Helix
6.9%inclusion2 decks29 decks
6%synergy
Unwanted Remake
6.9%inclusion2 decks29 decks
6%synergy
Long River's Pull
6.9%inclusion2 decks29 decks
6%synergy
Refute
6.9%inclusion2 decks29 decks
4%synergy
Soul Partition
6.9%inclusion2 decks29 decks
7%synergy
Banishing Knack
6.9%inclusion2 decks29 decks
7%synergy
Miscast
6.9%inclusion2 decks29 decks
6%synergy
Waterlogged Teachings
6.9%inclusion2 decks29 decks
2%synergy
Disenchant
6.9%inclusion2 decks29 decks
5%synergy
Sorceries
Sevinne's Reclamation
38%inclusion11 decks29 decks
29%synergy
Redress Fate
38%inclusion11 decks29 decks
32%synergy
Lively Dirge
24%inclusion7 decks29 decks
23%synergy
Extinguish All Hope
24%inclusion7 decks29 decks
23%synergy
Unmarked Grave
17%inclusion5 decks29 decks
16%synergy
Time Wipe
17%inclusion5 decks29 decks
11%synergy
Demonic Counsel
17%inclusion5 decks29 decks
16%synergy
Windfall
14%inclusion4 decks29 decks
1%synergy
Terminus
14%inclusion4 decks29 decks
10%synergy
Read the Bones
14%inclusion4 decks29 decks
10%synergy
Ponder
10%inclusion3 decks29 decks
1%synergy
Buried Alive
10%inclusion3 decks29 decks
6%synergy
Final Parting
10%inclusion3 decks29 decks
10%synergy
Portent
10%inclusion3 decks29 decks
7%synergy
Resurgent Belief
10%inclusion3 decks29 decks
8%synergy
Insatiable Avarice
10%inclusion3 decks29 decks
9%synergy
Damn
10%inclusion3 decks29 decks
-10%synergy
Entreat the Angels
10%inclusion3 decks29 decks
8%synergy
Singularity Rupture
10%inclusion2 decks20 decks
8%synergy
Commune with Evil
6.9%inclusion2 decks29 decks
7%synergy
Unearth
6.9%inclusion2 decks29 decks
5%synergy
Whispering Madness
6.9%inclusion2 decks29 decks
5%synergy
Aminatou's Augury
6.9%inclusion2 decks29 decks
6%synergy
Diabolic Vision
6.9%inclusion2 decks29 decks
5%synergy
Reanimate
6.9%inclusion2 decks29 decks
-9%synergy
Dance of the Manse
6.9%inclusion2 decks29 decks
4%synergy
Glimpse the Unthinkable
6.9%inclusion2 decks29 decks
6%synergy
Ringsight
6.9%inclusion2 decks29 decks
6%synergy
Traumatize
6.9%inclusion2 decks29 decks
6%synergy
Utility Artifacts
Keys to the House
21%inclusion6 decks29 decks
20%synergy
Wishclaw Talisman
17%inclusion5 decks29 decks
9%synergy
Cloud Key
10%inclusion3 decks29 decks
7%synergy
The Everflowing Well
6.9%inclusion2 decks29 decks
6%synergy
Wayfarer's Bauble
6.9%inclusion2 decks29 decks
-1%synergy
Swiftfoot Boots
6.9%inclusion2 decks29 decks
-17%synergy
Enchantments
Timely Ward
45%inclusion13 decks29 decks
40%synergy
Dress Down
45%inclusion13 decks29 decks
43%synergy
Ripples of Undeath
41%inclusion12 decks29 decks
39%synergy
Bottomless Pool // Locker Room
41%inclusion12 decks29 decks
39%synergy
Animate Dead
38%inclusion11 decks29 decks
28%synergy
Ethereal Armor
34%inclusion10 decks29 decks
30%synergy
Monologue Tax
34%inclusion10 decks29 decks
28%synergy
Shark Typhoon
31%inclusion9 decks29 decks
25%synergy
Defiled Crypt // Cadaver Lab
31%inclusion9 decks29 decks
30%synergy
Seal of Cleansing
31%inclusion9 decks29 decks
30%synergy
Central Elevator // Promising Stairs
31%inclusion9 decks29 decks
30%synergy
Cemetery Tampering
31%inclusion9 decks29 decks
30%synergy
Mirror Room // Fractured Realm
28%inclusion8 decks29 decks
25%synergy
Amphibian Downpour
28%inclusion8 decks29 decks
23%synergy
Restricted Office // Lecture Hall
28%inclusion8 decks29 decks
26%synergy
One with the Multiverse
24%inclusion7 decks29 decks
19%synergy
Seal of Removal
24%inclusion7 decks29 decks
24%synergy
Polluted Cistern // Dim Oubliette
24%inclusion7 decks29 decks
24%synergy
Cramped Vents // Access Maze
24%inclusion7 decks29 decks
22%synergy
Unable to Scream
24%inclusion7 decks29 decks
23%synergy
Meat Locker // Drowned Diner
24%inclusion7 decks29 decks
24%synergy
Cast Out
24%inclusion7 decks29 decks
21%synergy
Founding the Third Path
21%inclusion6 decks29 decks
21%synergy
The Eldest Reborn
21%inclusion6 decks29 decks
18%synergy
Touch the Spirit Realm
21%inclusion6 decks29 decks
18%synergy
Surgical Suite // Hospital Room
21%inclusion6 decks29 decks
20%synergy
Dazzling Theater // Prop Room
21%inclusion6 decks29 decks
19%synergy
Sheltered by Ghosts
21%inclusion6 decks29 decks
18%synergy
Grasp of Fate
21%inclusion6 decks29 decks
15%synergy
Estrid's Invocation
21%inclusion6 decks29 decks
16%synergy
Nowhere to Run
21%inclusion6 decks29 decks
20%synergy
Necromancy
21%inclusion6 decks29 decks
16%synergy
Stillness in Motion
20%inclusion5 decks25 decks
20%synergy
Tinybones Joins Up
17%inclusion5 decks29 decks
16%synergy
Derelict Attic // Widow's Walk
17%inclusion5 decks29 decks
17%synergy
All That Glitters
17%inclusion5 decks29 decks
9%synergy
Witness Protection
17%inclusion5 decks29 decks
15%synergy
Secrets of the Dead
17%inclusion5 decks29 decks
17%synergy
Cacophony Unleashed
17%inclusion5 decks29 decks
16%synergy
Mystic Remora
17%inclusion5 decks29 decks
-3%synergy
Static Prison
17%inclusion5 decks29 decks
17%synergy
Propaganda
17%inclusion5 decks29 decks
-11%synergy
Blind Obedience
17%inclusion5 decks29 decks
5%synergy
Hallowed Haunting
17%inclusion5 decks29 decks
15%synergy
Darksteel Mutation
14%inclusion4 decks29 decks
8%synergy
Aura of Silence
14%inclusion4 decks29 decks
11%synergy
Phyrexian Arena
14%inclusion4 decks29 decks
0%synergy
Copy Enchantment
14%inclusion4 decks29 decks
9%synergy
The Tale of Tamiyo
14%inclusion4 decks29 decks
13%synergy
Enchanted Evening
14%inclusion4 decks29 decks
12%synergy
Battles
Invasion of Theros
6.9%inclusion2 decks29 decks
5%synergy
Utility Lands
Hall of Heliod's Generosity
55%inclusion16 decks29 decks
42%synergy
Bojuka Bog
41%inclusion12 decks29 decks
14%synergy
Halimar Depths
31%inclusion9 decks29 decks
26%synergy
Cephalid Coliseum
17%inclusion5 decks29 decks
14%synergy
Reliquary Tower
6.9%inclusion2 decks29 decks
-27%synergy
Rogue's Passage
6.9%inclusion2 decks29 decks
-3%synergy
Nephalia Drownyard
6.9%inclusion2 decks29 decks
6%synergy
Mana Artifacts
Sol Ring
90%inclusion26 decks29 decks
0%synergy
Arcane Signet
90%inclusion26 decks29 decks
2%synergy
Azorius Signet
59%inclusion17 decks29 decks
28%synergy
Orzhov Signet
55%inclusion16 decks29 decks
23%synergy
Mind Stone
34%inclusion10 decks29 decks
22%synergy
Talisman of Progress
31%inclusion9 decks29 decks
-13%synergy
Fellwar Stone
31%inclusion9 decks29 decks
-2%synergy
Talisman of Hierarchy
31%inclusion9 decks29 decks
-13%synergy
Commander's Sphere
28%inclusion8 decks29 decks
10%synergy
Talisman of Dominance
28%inclusion8 decks29 decks
-22%synergy
Dimir Signet
24%inclusion7 decks29 decks
-7%synergy
Bender's Waterskin
5.0%inclusion1 decks20 decks
0%synergy
Lands
Island
100%inclusion29 decks29 decks
7%synergy
Plains
100%inclusion29 decks29 decks
8%synergy
Swamp
100%inclusion29 decks29 decks
8%synergy
Command Tower
90%inclusion26 decks29 decks
-3%synergy
Caves of Koilos
79%inclusion23 decks29 decks
44%synergy
Underground River
72%inclusion21 decks29 decks
38%synergy
Adarkar Wastes
72%inclusion21 decks29 decks
41%synergy
Arcane Sanctum
66%inclusion19 decks29 decks
11%synergy
Terramorphic Expanse
59%inclusion17 decks29 decks
43%synergy
Evolving Wilds
55%inclusion16 decks29 decks
30%synergy
Orzhov Basilica
55%inclusion16 decks29 decks
40%synergy
Obscura Storefront
55%inclusion16 decks29 decks
46%synergy
Temple of Silence
55%inclusion16 decks29 decks
36%synergy
Temple of Deceit
52%inclusion15 decks29 decks
34%synergy
Azorius Chancery
52%inclusion15 decks29 decks
38%synergy
Tainted Isle
48%inclusion14 decks29 decks
42%synergy
Temple of Enlightenment
48%inclusion14 decks29 decks
32%synergy
Dimir Aqueduct
48%inclusion14 decks29 decks
35%synergy
Tainted Field
48%inclusion14 decks29 decks
41%synergy
Ash Barrens
41%inclusion12 decks29 decks
31%synergy
Exotic Orchard
34%inclusion10 decks29 decks
-24%synergy
Glacial Fortress
34%inclusion10 decks29 decks
-8%synergy
Isolated Chapel
34%inclusion10 decks29 decks
-6%synergy
Thriving Isle
31%inclusion9 decks29 decks
27%synergy
Thriving Moor
31%inclusion9 decks29 decks
27%synergy
Thriving Heath
31%inclusion9 decks29 decks
27%synergy
Sunken Hollow
31%inclusion9 decks29 decks
-9%synergy
Prairie Stream
28%inclusion8 decks29 decks
-13%synergy
River of Tears
21%inclusion6 decks29 decks
19%synergy
Contaminated Landscape
21%inclusion6 decks29 decks
7%synergy
Skycloud Expanse
21%inclusion6 decks29 decks
6%synergy
Drowned Catacomb
21%inclusion6 decks29 decks
-17%synergy
Darkwater Catacombs
17%inclusion5 decks29 decks
3%synergy
Dismal Backwater
10%inclusion3 decks29 decks
4%synergy
Valgavoth's Lair
10%inclusion3 decks29 decks
8%synergy
Raffine's Tower
10%inclusion3 decks29 decks
-30%synergy
Spire of Industry
10%inclusion3 decks29 decks
2%synergy
Hydroelectric Specimen
10%inclusion3 decks29 decks
8%synergy
Undercity Sewers
6.9%inclusion2 decks29 decks
-8%synergy
Fetid Heath
6.9%inclusion2 decks29 decks
-6%synergy
Promising Vein
6.9%inclusion2 decks29 decks
7%synergy
Shineshadow Snarl
6.9%inclusion2 decks29 decks
-4%synergy
Scoured Barrens
6.9%inclusion2 decks29 decks
1%synergy
Waterlogged Teachings
6.9%inclusion2 decks29 decks
2%synergy
Abandoned Campground
6.9%inclusion2 decks29 decks
6%synergy
Myriad Landscape
6.9%inclusion2 decks29 decks
-1%synergy
Dimir Guildgate
6.9%inclusion2 decks29 decks
5%synergy
Tranquil Cove
6.9%inclusion2 decks29 decks
1%synergy
Choked Estuary
6.9%inclusion2 decks29 decks
-9%synergy
Floodfarm Verge
6.9%inclusion2 decks29 decks
-4%synergy
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