The Master of Keys (Commander) - Budget Core

The Master of Keys
Rank #303
45decks
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Budget
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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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Battles
Utility Lands
Mana Artifacts
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Super Intelligence
50%inclusion1 decks2 decks
50%synergy
High Synergy Cards
Inquisitive Glimmer
78%inclusion35 decks45 decks
71%synergy
Scrabbling Skullcrab
67%inclusion30 decks45 decks
66%synergy
Mesa Enchantress
67%inclusion30 decks45 decks
58%synergy
Cemetery Tampering
53%inclusion24 decks45 decks
53%synergy
Defiled Crypt // Cadaver Lab
49%inclusion22 decks45 decks
48%synergy
Demon of Fate's Design
53%inclusion24 decks45 decks
48%synergy
Gravebreaker Lamia
49%inclusion22 decks45 decks
48%synergy
Seal of Cleansing
49%inclusion22 decks45 decks
47%synergy
Doomwake Giant
51%inclusion23 decks45 decks
45%synergy
Entity Tracker
51%inclusion23 decks45 decks
45%synergy
Top Cards
Starfield Mystic
51%inclusion23 decks45 decks
45%synergy
Victor, Valgavoth's Seneschal
44%inclusion20 decks45 decks
43%synergy
Fear of Impostors
42%inclusion19 decks45 decks
41%synergy
Stillness in Motion
41%inclusion12 decks29 decks
41%synergy
Unable to Scream
40%inclusion18 decks45 decks
39%synergy
Ghostly Dancers
40%inclusion18 decks45 decks
38%synergy
Ethereal Armor
40%inclusion18 decks45 decks
35%synergy
Sigil of the Empty Throne
38%inclusion17 decks45 decks
32%synergy
Skullsnap Nuisance
38%inclusion17 decks45 decks
37%synergy
Sage of Mysteries
38%inclusion17 decks45 decks
37%synergy
Creatures
Fear of Sleep Paralysis
33%inclusion15 decks45 decks
28%synergy
Mindwrack Harpy
31%inclusion14 decks45 decks
31%synergy
Archon of Sun's Grace
27%inclusion12 decks45 decks
22%synergy
Soaring Lightbringer
27%inclusion12 decks45 decks
22%synergy
Balemurk Leech
27%inclusion12 decks45 decks
26%synergy
Gremlin Tamer
27%inclusion12 decks45 decks
26%synergy
Grim Guardian
27%inclusion12 decks45 decks
24%synergy
Zur the Enchanter
27%inclusion12 decks45 decks
22%synergy
Fear of Infinity
24%inclusion11 decks45 decks
24%synergy
Fear of Surveillance
24%inclusion11 decks45 decks
24%synergy
Appendage Amalgam
24%inclusion11 decks45 decks
24%synergy
Millikin
24%inclusion11 decks45 decks
24%synergy
Alseid of Life's Bounty
24%inclusion11 decks45 decks
23%synergy
Starnheim Courser
22%inclusion10 decks45 decks
19%synergy
Silent Hallcreeper
22%inclusion10 decks45 decks
18%synergy
Spirited Companion
22%inclusion10 decks45 decks
20%synergy
Fear of Isolation
20%inclusion9 decks45 decks
20%synergy
Moon-Blessed Cleric
20%inclusion9 decks45 decks
15%synergy
Aminatou, Veil Piercer
20%inclusion9 decks45 decks
19%synergy
Heliod, the Radiant Dawn
20%inclusion9 decks45 decks
17%synergy
Fear of Lost Teeth
16%inclusion7 decks45 decks
15%synergy
Callaphe, Beloved of the Sea
16%inclusion7 decks45 decks
14%synergy
Summon: Yojimbo
14%inclusion4 decks28 decks
13%synergy
Overlord of the Floodpits
13%inclusion6 decks45 decks
10%synergy
Archetype of Imagination
13%inclusion6 decks45 decks
9%synergy
Deranged Assistant
13%inclusion6 decks45 decks
13%synergy
Nashi, Searcher in the Dark
13%inclusion6 decks45 decks
13%synergy
Creeping Peeper
13%inclusion6 decks45 decks
13%synergy
Ondu Spiritdancer
13%inclusion6 decks45 decks
7%synergy
Ashiok's Reaper
11%inclusion5 decks45 decks
11%synergy
Fear of the Dark
11%inclusion5 decks45 decks
11%synergy
Ajani's Chosen
11%inclusion5 decks45 decks
11%synergy
Zur, Eternal Schemer
11%inclusion5 decks45 decks
8%synergy
Summon: Primal Odin
11%inclusion3 decks28 decks
6%synergy
Fear of Falling
8.9%inclusion4 decks45 decks
9%synergy
Optimistic Scavenger
8.9%inclusion4 decks45 decks
9%synergy
Solemn Simulacrum
8.9%inclusion4 decks45 decks
-4%synergy
Patrician Geist
8.9%inclusion4 decks45 decks
9%synergy
Fear of Failed Tests
8.9%inclusion4 decks45 decks
8%synergy
Stitcher's Supplier
8.9%inclusion4 decks45 decks
8%synergy
Clammy Prowler
8.9%inclusion4 decks45 decks
9%synergy
Nightmare Shepherd
8.9%inclusion4 decks45 decks
7%synergy
Indebted Spirit
8.9%inclusion4 decks45 decks
9%synergy
Transcendent Envoy
8.9%inclusion4 decks45 decks
8%synergy
Summon: Shiva
8.8%inclusion3 decks34 decks
9%synergy
Dreadwing Scavenger
7.1%inclusion3 decks42 decks
7%synergy
Emet-Selch of the Third Seat
7.1%inclusion2 decks28 decks
-2%synergy
Killian, Decisive Mentor
7.1%inclusion1 decks14 decks
6%synergy
The Mindskinner
6.7%inclusion3 decks45 decks
6%synergy
Spectral Snatcher
6.7%inclusion3 decks45 decks
7%synergy
Instants
Negate
24%inclusion11 decks45 decks
8%synergy
Fact or Fiction
24%inclusion11 decks45 decks
21%synergy
Swords to Plowshares
24%inclusion11 decks45 decks
-43%synergy
Thirst for Meaning
22%inclusion10 decks45 decks
21%synergy
Path to Exile
22%inclusion10 decks45 decks
-20%synergy
Otherworldly Gaze
20%inclusion9 decks45 decks
18%synergy
Void Rend
18%inclusion8 decks45 decks
-17%synergy
Frantic Search
16%inclusion7 decks45 decks
-3%synergy
Rowan's Grim Search
13%inclusion6 decks45 decks
13%synergy
Unwanted Remake
11%inclusion5 decks45 decks
11%synergy
Refute
9.3%inclusion4 decks43 decks
7%synergy
Drown in the Loch
8.9%inclusion4 decks45 decks
7%synergy
Forbidden Alchemy
8.9%inclusion4 decks45 decks
8%synergy
Dreams of Laguna
7.4%inclusion2 decks27 decks
7%synergy
Swallowed by Leviathan
7.4%inclusion2 decks27 decks
7%synergy
Get Out
6.7%inclusion3 decks45 decks
6%synergy
Despark
6.7%inclusion3 decks45 decks
-9%synergy
Utter End
6.7%inclusion3 decks45 decks
1%synergy
Drown in Dreams
6.7%inclusion3 decks45 decks
6%synergy
Live or Die
6.7%inclusion3 decks45 decks
7%synergy
Don't Make a Sound
6.7%inclusion3 decks45 decks
6%synergy
Murder
6.7%inclusion3 decks45 decks
5%synergy
Mortify
6.7%inclusion3 decks45 decks
-2%synergy
Sorceries
Singularity Rupture
36%inclusion9 decks25 decks
34%synergy
Sevinne's Reclamation
29%inclusion13 decks45 decks
20%synergy
Extinguish All Hope
24%inclusion11 decks45 decks
23%synergy
Redress Fate
24%inclusion11 decks45 decks
19%synergy
Space-Time Anomaly
20%inclusion5 decks25 decks
18%synergy
Open the Vaults
16%inclusion7 decks45 decks
14%synergy
Time Wipe
16%inclusion7 decks45 decks
9%synergy
Dance of the Manse
16%inclusion7 decks45 decks
12%synergy
Final Vengeance
13%inclusion6 decks45 decks
13%synergy
Commune with Evil
11%inclusion5 decks45 decks
11%synergy
Brilliant Restoration
11%inclusion5 decks45 decks
9%synergy
Damn
11%inclusion5 decks45 decks
-9%synergy
Resurgent Belief
8.9%inclusion4 decks45 decks
7%synergy
Inspiration from Beyond
7.0%inclusion3 decks43 decks
7%synergy
Wail of the Forgotten
6.7%inclusion3 decks45 decks
7%synergy
Austere Command
6.7%inclusion3 decks45 decks
-2%synergy
Terror Tide
6.7%inclusion3 decks45 decks
7%synergy
Unmarked Grave
6.7%inclusion3 decks45 decks
5%synergy
Tome Scour
6.7%inclusion3 decks45 decks
7%synergy
Painful Truths
6.7%inclusion3 decks45 decks
4%synergy
Night's Whisper
6.7%inclusion3 decks45 decks
4%synergy
Notion Rain
6.7%inclusion3 decks45 decks
6%synergy
Compulsive Research
6.7%inclusion3 decks45 decks
6%synergy
Diresight
6.7%inclusion3 decks45 decks
6%synergy
Rite of the Moth
6.7%inclusion3 decks45 decks
7%synergy
Utility Artifacts
Wayfarer's Bauble
18%inclusion8 decks45 decks
11%synergy
Perpetual Timepiece
16%inclusion7 decks45 decks
15%synergy
Matzalantli, the Great Door
8.9%inclusion4 decks45 decks
7%synergy
Keys to the House
8.9%inclusion4 decks45 decks
9%synergy
The Everflowing Well
6.7%inclusion3 decks45 decks
6%synergy
Cloud Key
6.7%inclusion3 decks45 decks
3%synergy
Enchantments
Seal of Removal
36%inclusion16 decks45 decks
35%synergy
Imprisoned in the Moon
33%inclusion15 decks45 decks
27%synergy
The Tale of Tamiyo
33%inclusion15 decks45 decks
33%synergy
Grasp of Fate
31%inclusion14 decks45 decks
25%synergy
All That Glitters
31%inclusion14 decks45 decks
23%synergy
Seal of Doom
31%inclusion14 decks45 decks
31%synergy
Cacophony Unleashed
29%inclusion13 decks45 decks
27%synergy
Estrid's Invocation
29%inclusion13 decks45 decks
24%synergy
Derelict Attic // Widow's Walk
29%inclusion13 decks45 decks
28%synergy
Restricted Office // Lecture Hall
29%inclusion13 decks45 decks
27%synergy
Secrets of the Dead
29%inclusion13 decks45 decks
29%synergy
The Eldest Reborn
24%inclusion11 decks45 decks
22%synergy
Dress Down
24%inclusion11 decks45 decks
22%synergy
Propaganda
24%inclusion11 decks45 decks
-5%synergy
Bottomless Pool // Locker Room
22%inclusion10 decks45 decks
20%synergy
Underwater Tunnel // Slimy Aquarium
20%inclusion9 decks45 decks
20%synergy
Glasswing Grace
20%inclusion9 decks45 decks
17%synergy
Shardmage's Rescue
20%inclusion9 decks45 decks
20%synergy
Surgical Suite // Hospital Room
20%inclusion9 decks45 decks
20%synergy
Darksteel Mutation
18%inclusion8 decks45 decks
12%synergy
Ripples of Undeath
18%inclusion8 decks45 decks
15%synergy
Soul Snare
18%inclusion8 decks45 decks
17%synergy
Mirrormade
18%inclusion8 decks45 decks
8%synergy
Sphere of Safety
18%inclusion8 decks45 decks
8%synergy
Amphibian Downpour
18%inclusion8 decks45 decks
13%synergy
Ballad of the Black Flag
18%inclusion8 decks45 decks
17%synergy
Utter Insignificance
16%inclusion7 decks45 decks
15%synergy
King Narfi's Betrayal
16%inclusion7 decks45 decks
15%synergy
Extravagant Replication
16%inclusion7 decks45 decks
11%synergy
Shark Typhoon
16%inclusion7 decks45 decks
10%synergy
Secret Arcade // Dusty Parlor
16%inclusion7 decks45 decks
11%synergy
Meat Locker // Drowned Diner
16%inclusion7 decks45 decks
15%synergy
Cast Out
16%inclusion7 decks45 decks
13%synergy
Polluted Cistern // Dim Oubliette
16%inclusion7 decks45 decks
15%synergy
Primary Research
14%inclusion1 decks7 decks
14%synergy
Minimus Containment
13%inclusion6 decks45 decks
13%synergy
Cramped Vents // Access Maze
13%inclusion6 decks45 decks
11%synergy
Chronic Flooding
13%inclusion6 decks45 decks
13%synergy
Hopeless Nightmare
13%inclusion6 decks45 decks
13%synergy
Copy Enchantment
13%inclusion6 decks45 decks
9%synergy
Central Elevator // Promising Stairs
13%inclusion6 decks45 decks
13%synergy
Sheltered by Ghosts
13%inclusion6 decks45 decks
11%synergy
Nowhere to Run
13%inclusion6 decks45 decks
12%synergy
The Restoration of Eiganjo
13%inclusion6 decks45 decks
13%synergy
Witness Protection
13%inclusion6 decks45 decks
11%synergy
Trapped in the Screen
11%inclusion5 decks45 decks
11%synergy
Elspeth Conquers Death
11%inclusion5 decks45 decks
11%synergy
Genesis of the Daleks
11%inclusion5 decks45 decks
11%synergy
Touch the Spirit Realm
11%inclusion5 decks45 decks
9%synergy
Sporogenic Infection
11%inclusion5 decks45 decks
11%synergy
Battles
Invasion of Theros
16%inclusion7 decks45 decks
14%synergy
Utility Lands
Bojuka Bog
27%inclusion12 decks45 decks
-0%synergy
Hall of Heliod's Generosity
11%inclusion5 decks45 decks
-2%synergy
Nephalia Drownyard
8.9%inclusion4 decks45 decks
8%synergy
Ishgard, the Holy See
7.1%inclusion2 decks28 decks
4%synergy
Cephalid Coliseum
6.7%inclusion3 decks45 decks
3%synergy
Mana Artifacts
Arcane Signet
69%inclusion31 decks45 decks
-19%synergy
Sol Ring
60%inclusion27 decks45 decks
-30%synergy
Azorius Signet
49%inclusion22 decks45 decks
19%synergy
Dimir Signet
47%inclusion21 decks45 decks
17%synergy
Orzhov Signet
44%inclusion20 decks45 decks
13%synergy
Talisman of Progress
31%inclusion14 decks45 decks
-13%synergy
Talisman of Hierarchy
29%inclusion13 decks45 decks
-16%synergy
Talisman of Dominance
24%inclusion11 decks45 decks
-26%synergy
Commander's Sphere
20%inclusion9 decks45 decks
3%synergy
Mind Stone
16%inclusion7 decks45 decks
4%synergy
Fellwar Stone
16%inclusion7 decks45 decks
-18%synergy
Obelisk of Esper
6.7%inclusion3 decks45 decks
5%synergy
Lands
Island
100%inclusion45 decks45 decks
7%synergy
Swamp
98%inclusion44 decks45 decks
6%synergy
Plains
98%inclusion44 decks45 decks
6%synergy
Command Tower
80%inclusion36 decks45 decks
-13%synergy
Exotic Orchard
56%inclusion25 decks45 decks
-3%synergy
Contaminated Landscape
56%inclusion25 decks45 decks
42%synergy
Arcane Sanctum
56%inclusion25 decks45 decks
2%synergy
Terramorphic Expanse
47%inclusion21 decks45 decks
31%synergy
Prairie Stream
47%inclusion21 decks45 decks
6%synergy
Sunken Hollow
42%inclusion19 decks45 decks
2%synergy
Evolving Wilds
42%inclusion19 decks45 decks
18%synergy
Glacial Fortress
40%inclusion18 decks45 decks
-3%synergy
Temple of Enlightenment
36%inclusion16 decks45 decks
20%synergy
Isolated Chapel
36%inclusion16 decks45 decks
-6%synergy
Obscura Storefront
33%inclusion15 decks45 decks
24%synergy
Caves of Koilos
31%inclusion14 decks45 decks
-5%synergy
Choked Estuary
31%inclusion14 decks45 decks
15%synergy
Temple of Deceit
29%inclusion13 decks45 decks
12%synergy
Temple of Silence
29%inclusion13 decks45 decks
11%synergy
Shineshadow Snarl
29%inclusion13 decks45 decks
18%synergy
Adarkar Wastes
29%inclusion13 decks45 decks
-4%synergy
Tainted Field
27%inclusion12 decks45 decks
20%synergy
Port Town
27%inclusion12 decks45 decks
10%synergy
Tainted Isle
24%inclusion11 decks45 decks
18%synergy
Myriad Landscape
24%inclusion11 decks45 decks
17%synergy
Dimir Aqueduct
24%inclusion11 decks45 decks
12%synergy
Skycloud Expanse
24%inclusion11 decks45 decks
9%synergy
Azorius Chancery
22%inclusion10 decks45 decks
9%synergy
Darkwater Catacombs
22%inclusion10 decks45 decks
7%synergy
Valgavoth's Lair
22%inclusion10 decks45 decks
20%synergy
Irrigated Farmland
22%inclusion10 decks45 decks
15%synergy
Orzhov Basilica
22%inclusion10 decks45 decks
8%synergy
Path of Ancestry
22%inclusion10 decks45 decks
-6%synergy
Glasswing Grace
20%inclusion9 decks45 decks
17%synergy
Drowned Catacomb
20%inclusion9 decks45 decks
-18%synergy
Underground River
18%inclusion8 decks45 decks
-17%synergy
Tranquil Cove
16%inclusion7 decks45 decks
10%synergy
Fetid Pools
13%inclusion6 decks45 decks
7%synergy
Fetid Heath
13%inclusion6 decks45 decks
-0%synergy
Ash Barrens
13%inclusion6 decks45 decks
3%synergy
Scoured Barrens
13%inclusion6 decks45 decks
7%synergy
Escape Tunnel
11%inclusion5 decks45 decks
10%synergy
Foot Headquarters
9.1%inclusion1 decks11 decks
8%synergy
Desolate Mire
8.9%inclusion4 decks45 decks
2%synergy
Dismal Backwater
8.9%inclusion4 decks45 decks
3%synergy
Sunlit Marsh
8.9%inclusion4 decks45 decks
4%synergy
Thriving Moor
8.9%inclusion4 decks45 decks
5%synergy
Vibrant Cityscape
8.7%inclusion2 decks23 decks
8%synergy
Thriving Isle
6.7%inclusion3 decks45 decks
2%synergy
Esper Panorama
6.7%inclusion3 decks45 decks
4%synergy
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