The Master of Keys (Commander) - 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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Battles
Utility Lands
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Air Nomad Legacy
3.4%inclusion1 decks29 decks
3%synergy
Waterbender Ascension
3.3%inclusion1 decks30 decks
2%synergy
Bender's Waterskin
2.5%inclusion2 decks81 decks
0%synergy
The Rise of Sozin
1.2%inclusion1 decks82 decks
1%synergy
High Synergy Cards
Inquisitive Glimmer
76%inclusion275 decks362 decks
68%synergy
Mesa Enchantress
77%inclusion278 decks362 decks
68%synergy
Starfield Mystic
70%inclusion255 decks362 decks
64%synergy
Entity Tracker
66%inclusion238 decks362 decks
59%synergy
Demon of Fate's Design
63%inclusion229 decks362 decks
58%synergy
Doomwake Giant
63%inclusion227 decks362 decks
57%synergy
Ripples of Undeath
55%inclusion198 decks362 decks
52%synergy
Fear of Sleep Paralysis
57%inclusion206 decks362 decks
51%synergy
Scrabbling Skullcrab
52%inclusion187 decks362 decks
51%synergy
Gravebreaker Lamia
51%inclusion184 decks362 decks
50%synergy
Top Cards
Secret Arcade // Dusty Parlor
52%inclusion190 decks362 decks
47%synergy
Ondu Spiritdancer
52%inclusion190 decks362 decks
46%synergy
Sigil of the Empty Throne
52%inclusion189 decks362 decks
46%synergy
Swords to Plowshares
51%inclusion186 decks362 decks
-17%synergy
Mirrormade
51%inclusion183 decks362 decks
41%synergy
Sphere of Safety
50%inclusion182 decks362 decks
41%synergy
Redress Fate
47%inclusion169 decks362 decks
40%synergy
Victor, Valgavoth's Seneschal
46%inclusion167 decks362 decks
44%synergy
Grasp of Fate
41%inclusion150 decks362 decks
35%synergy
Fear of Impostors
41%inclusion149 decks362 decks
40%synergy
Creatures
Soaring Lightbringer
40%inclusion143 decks362 decks
34%synergy
Overlord of the Floodpits
39%inclusion142 decks362 decks
35%synergy
Ghostly Dancers
38%inclusion138 decks362 decks
35%synergy
Overlord of the Balemurk
35%inclusion125 decks362 decks
32%synergy
Aminatou, Veil Piercer
32%inclusion116 decks362 decks
31%synergy
Moon-Blessed Cleric
31%inclusion111 decks362 decks
26%synergy
Heliod, the Radiant Dawn
30%inclusion110 decks362 decks
26%synergy
Zur, Eternal Schemer
30%inclusion107 decks362 decks
26%synergy
Enduring Curiosity
29%inclusion106 decks362 decks
22%synergy
Archon of Sun's Grace
28%inclusion102 decks362 decks
23%synergy
Silent Hallcreeper
28%inclusion101 decks362 decks
24%synergy
Grim Guardian
27%inclusion97 decks362 decks
24%synergy
Athreos, Shroud-Veiled
25%inclusion92 decks362 decks
21%synergy
Archetype of Imagination
22%inclusion81 decks362 decks
18%synergy
Skullsnap Nuisance
22%inclusion80 decks362 decks
22%synergy
Zur the Enchanter
22%inclusion80 decks362 decks
17%synergy
Mindwrack Harpy
21%inclusion76 decks362 decks
21%synergy
Sage of Mysteries
20%inclusion74 decks362 decks
20%synergy
Ancient Cellarspawn
20%inclusion71 decks362 decks
16%synergy
Alseid of Life's Bounty
17%inclusion63 decks362 decks
16%synergy
Balemurk Leech
17%inclusion62 decks362 decks
16%synergy
Overlord of the Mistmoors
17%inclusion61 decks362 decks
15%synergy
Nightmare Shepherd
16%inclusion57 decks362 decks
13%synergy
Auramancer
15%inclusion53 decks362 decks
12%synergy
Spirited Companion
14%inclusion52 decks362 decks
12%synergy
Gremlin Tamer
14%inclusion52 decks362 decks
13%synergy
Solemn Simulacrum
13%inclusion48 decks362 decks
-2%synergy
Fear of Infinity
13%inclusion46 decks362 decks
12%synergy
Nashi, Searcher in the Dark
13%inclusion46 decks362 decks
12%synergy
Summon: Yojimbo
12%inclusion15 decks126 decks
11%synergy
Metamorphosis Fanatic
10%inclusion36 decks362 decks
5%synergy
Starnheim Courser
9.4%inclusion34 decks362 decks
5%synergy
Arvinox, the Mind Flail
8.8%inclusion32 decks362 decks
7%synergy
Creeping Peeper
8.6%inclusion31 decks362 decks
8%synergy
Sun Titan
7.5%inclusion27 decks362 decks
-1%synergy
Millikin
7.2%inclusion26 decks362 decks
7%synergy
Burnished Hart
6.9%inclusion25 decks362 decks
3%synergy
Stenn, Paranoid Partisan
6.6%inclusion24 decks362 decks
5%synergy
Enduring Innocence
6.6%inclusion24 decks362 decks
5%synergy
Witch Enchanter
6.1%inclusion22 decks362 decks
-1%synergy
Phenomenon Investigators
5.8%inclusion21 decks362 decks
5%synergy
Fear of Surveillance
5.8%inclusion21 decks362 decks
5%synergy
Stitcher's Supplier
5.8%inclusion21 decks362 decks
5%synergy
Ashiok's Reaper
5.5%inclusion20 decks362 decks
5%synergy
Enduring Tenacity
5.5%inclusion20 decks362 decks
-2%synergy
Dream Eater
5.5%inclusion20 decks362 decks
5%synergy
Ghostly Keybearer
5.5%inclusion20 decks362 decks
5%synergy
Fear of Failed Tests
5.2%inclusion19 decks362 decks
5%synergy
Dreadwing Scavenger
5.1%inclusion15 decks292 decks
4%synergy
Instants
Arcane Denial
37%inclusion133 decks362 decks
16%synergy
Thirst for Meaning
30%inclusion110 decks362 decks
29%synergy
Path to Exile
28%inclusion102 decks362 decks
-14%synergy
Otherworldly Gaze
24%inclusion87 decks362 decks
22%synergy
Counterspell
24%inclusion87 decks362 decks
-17%synergy
Inkshield
22%inclusion81 decks362 decks
13%synergy
Void Rend
20%inclusion73 decks362 decks
-13%synergy
An Offer You Can't Refuse
18%inclusion65 decks362 decks
-8%synergy
Frantic Search
17%inclusion60 decks362 decks
0%synergy
Negate
15%inclusion55 decks362 decks
-1%synergy
Utter End
15%inclusion54 decks362 decks
8%synergy
Brainstorm
13%inclusion48 decks362 decks
-4%synergy
Return to Dust
10%inclusion37 decks362 decks
6%synergy
Dark Ritual
10%inclusion37 decks362 decks
-9%synergy
Dovin's Veto
10%inclusion35 decks362 decks
-15%synergy
Generous Gift
8.0%inclusion29 decks362 decks
-7%synergy
Fact or Fiction
7.2%inclusion26 decks362 decks
3%synergy
Fell the Profane
6.6%inclusion24 decks362 decks
-2%synergy
Entomb
6.1%inclusion22 decks362 decks
-1%synergy
Swan Song
6.1%inclusion22 decks362 decks
-13%synergy
Unwanted Remake
6.1%inclusion22 decks362 decks
6%synergy
Sink into Stupor
6.1%inclusion22 decks362 decks
-6%synergy
Anguished Unmaking
5.8%inclusion21 decks362 decks
-19%synergy
Telling Time
5.5%inclusion20 decks362 decks
3%synergy
Don't Make a Sound
5.0%inclusion18 decks360 decks
4%synergy
Sorceries
Sevinne's Reclamation
31%inclusion112 decks362 decks
22%synergy
Time Wipe
27%inclusion99 decks362 decks
20%synergy
Extinguish All Hope
25%inclusion89 decks362 decks
23%synergy
Dance of the Manse
24%inclusion88 decks362 decks
21%synergy
Windfall
17%inclusion62 decks362 decks
3%synergy
Resurgent Belief
13%inclusion48 decks362 decks
11%synergy
Singularity Rupture
13%inclusion12 decks94 decks
10%synergy
Damn
12%inclusion45 decks362 decks
-8%synergy
Terminus
11%inclusion40 decks362 decks
7%synergy
Reanimate
11%inclusion39 decks362 decks
-5%synergy
Ponder
10%inclusion37 decks362 decks
1%synergy
Glimpse the Unthinkable
10%inclusion35 decks362 decks
9%synergy
Space-Time Anomaly
8.7%inclusion8 decks92 decks
7%synergy
Read the Bones
8.3%inclusion30 decks362 decks
4%synergy
Brilliant Restoration
8.3%inclusion30 decks362 decks
6%synergy
Toxic Deluge
7.7%inclusion28 decks362 decks
-12%synergy
Austere Command
6.1%inclusion22 decks362 decks
-3%synergy
Diabolic Vision
6.1%inclusion22 decks362 decks
4%synergy
Portent
5.8%inclusion21 decks362 decks
2%synergy
Commune with Evil
5.5%inclusion20 decks362 decks
5%synergy
Open the Vaults
5.5%inclusion20 decks362 decks
4%synergy
Aminatou's Augury
5.2%inclusion19 decks362 decks
4%synergy
Utility Artifacts
Cloud Key
12%inclusion42 decks362 decks
8%synergy
Wayfarer's Bauble
10%inclusion35 decks362 decks
1%synergy
Keys to the House
9.4%inclusion34 decks361 decks
9%synergy
Lightning Greaves
8.8%inclusion32 decks362 decks
-13%synergy
Mesmeric Orb
7.7%inclusion28 decks362 decks
7%synergy
Perpetual Timepiece
5.8%inclusion21 decks362 decks
5%synergy
Whip of Erebos
5.5%inclusion20 decks362 decks
3%synergy
Swiftfoot Boots
5.2%inclusion19 decks362 decks
-18%synergy
Enchantments
Animate Dead
41%inclusion149 decks362 decks
31%synergy
Seal of Cleansing
41%inclusion149 decks362 decks
40%synergy
Dress Down
41%inclusion147 decks362 decks
38%synergy
Cemetery Tampering
39%inclusion141 decks362 decks
38%synergy
Defiled Crypt // Cadaver Lab
39%inclusion139 decks361 decks
38%synergy
Monologue Tax
38%inclusion139 decks362 decks
32%synergy
Cacophony Unleashed
35%inclusion127 decks362 decks
33%synergy
Propaganda
34%inclusion122 decks362 decks
8%synergy
Shark Typhoon
33%inclusion121 decks362 decks
28%synergy
Bottomless Pool // Locker Room
31%inclusion114 decks362 decks
29%synergy
Timely Ward
30%inclusion110 decks362 decks
25%synergy
Estrid's Invocation
30%inclusion109 decks362 decks
26%synergy
Amphibian Downpour
30%inclusion109 decks362 decks
26%synergy
Ethereal Armor
29%inclusion106 decks362 decks
25%synergy
Extravagant Replication
29%inclusion105 decks362 decks
24%synergy
All That Glitters
28%inclusion101 decks362 decks
19%synergy
Ghostly Prison
28%inclusion100 decks362 decks
6%synergy
Polluted Cistern // Dim Oubliette
27%inclusion98 decks362 decks
26%synergy
Mystic Remora
27%inclusion96 decks362 decks
5%synergy
The Eldest Reborn
26%inclusion94 decks362 decks
23%synergy
Stillness in Motion
26%inclusion40 decks156 decks
25%synergy
Cramped Vents // Access Maze
25%inclusion92 decks362 decks
23%synergy
Necromancy
25%inclusion91 decks362 decks
20%synergy
The Tale of Tamiyo
24%inclusion88 decks362 decks
24%synergy
Darksteel Mutation
23%inclusion85 decks362 decks
17%synergy
Mirror Room // Fractured Realm
22%inclusion81 decks362 decks
20%synergy
Starfield of Nyx
22%inclusion79 decks362 decks
18%synergy
Restricted Office // Lecture Hall
22%inclusion78 decks362 decks
19%synergy
Imprisoned in the Moon
19%inclusion70 decks362 decks
13%synergy
Blind Obedience
19%inclusion69 decks362 decks
7%synergy
Central Elevator // Promising Stairs
19%inclusion69 decks362 decks
18%synergy
Seal of Removal
19%inclusion67 decks362 decks
18%synergy
Sheltered by Ghosts
18%inclusion66 decks362 decks
16%synergy
Secrets of the Dead
18%inclusion66 decks362 decks
18%synergy
Hallowed Haunting
18%inclusion66 decks362 decks
16%synergy
Dazzling Theater // Prop Room
18%inclusion64 decks361 decks
16%synergy
One with the Multiverse
18%inclusion64 decks362 decks
13%synergy
Derelict Attic // Widow's Walk
18%inclusion63 decks360 decks
17%synergy
Phyrexian Arena
17%inclusion62 decks362 decks
3%synergy
Cast Out
17%inclusion61 decks362 decks
14%synergy
Meat Locker // Drowned Diner
16%inclusion59 decks360 decks
16%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion55 decks361 decks
15%synergy
Unable to Scream
15%inclusion55 decks362 decks
14%synergy
Copy Enchantment
15%inclusion55 decks362 decks
11%synergy
Spirit-Sister's Call
15%inclusion53 decks362 decks
13%synergy
Teval's Judgment
14%inclusion22 decks159 decks
13%synergy
Surgical Suite // Hospital Room
14%inclusion50 decks362 decks
13%synergy
Funeral Room // Awakening Hall
13%inclusion48 decks362 decks
12%synergy
Out of the Tombs
13%inclusion48 decks362 decks
13%synergy
Court of Cunning
13%inclusion47 decks362 decks
12%synergy
Battles
Invasion of Theros
10%inclusion36 decks362 decks
8%synergy
Utility Lands
Hall of Heliod's Generosity
60%inclusion218 decks362 decks
47%synergy
Bojuka Bog
49%inclusion177 decks362 decks
21%synergy
Halimar Depths
20%inclusion73 decks362 decks
15%synergy
Reliquary Tower
11%inclusion39 decks362 decks
-23%synergy
Cephalid Coliseum
7.7%inclusion28 decks362 decks
4%synergy
Adagia, Windswept Bastion
6.4%inclusion6 decks94 decks
4%synergy
Nephalia Drownyard
6.1%inclusion22 decks362 decks
6%synergy
Takenuma, Abandoned Mire
6.1%inclusion22 decks362 decks
0%synergy
Otawara, Soaring City
5.8%inclusion21 decks362 decks
-13%synergy
Mana Artifacts
Arcane Signet
88%inclusion320 decks362 decks
1%synergy
Sol Ring
81%inclusion295 decks362 decks
-9%synergy
Azorius Signet
57%inclusion205 decks362 decks
24%synergy
Orzhov Signet
53%inclusion193 decks362 decks
18%synergy
Talisman of Dominance
43%inclusion155 decks362 decks
-6%synergy
Talisman of Progress
40%inclusion146 decks362 decks
-2%synergy
Dimir Signet
36%inclusion130 decks362 decks
3%synergy
Talisman of Hierarchy
36%inclusion130 decks362 decks
-7%synergy
Fellwar Stone
25%inclusion91 decks362 decks
-9%synergy
Mind Stone
25%inclusion91 decks362 decks
12%synergy
Commander's Sphere
24%inclusion88 decks362 decks
5%synergy
Chromatic Lantern
7.7%inclusion28 decks362 decks
-6%synergy
Lands
Island
99%inclusion357 decks362 decks
6%synergy
Plains
98%inclusion353 decks362 decks
6%synergy
Swamp
97%inclusion350 decks362 decks
6%synergy
Command Tower
94%inclusion340 decks362 decks
2%synergy
Arcane Sanctum
72%inclusion262 decks362 decks
18%synergy
Adarkar Wastes
64%inclusion230 decks362 decks
33%synergy
Caves of Koilos
63%inclusion228 decks362 decks
28%synergy
Underground River
55%inclusion198 decks362 decks
23%synergy
Exotic Orchard
49%inclusion176 decks362 decks
-10%synergy
Obscura Storefront
46%inclusion166 decks362 decks
35%synergy
Terramorphic Expanse
44%inclusion159 decks362 decks
27%synergy
Evolving Wilds
44%inclusion158 decks362 decks
18%synergy
Temple of Enlightenment
42%inclusion153 decks362 decks
25%synergy
Temple of Silence
42%inclusion152 decks362 decks
22%synergy
Temple of Deceit
41%inclusion149 decks362 decks
23%synergy
Dimir Aqueduct
40%inclusion144 decks362 decks
26%synergy
Azorius Chancery
39%inclusion142 decks362 decks
24%synergy
Prairie Stream
38%inclusion138 decks362 decks
-2%synergy
Glacial Fortress
36%inclusion131 decks362 decks
-3%synergy
Contaminated Landscape
35%inclusion128 decks362 decks
21%synergy
Tainted Field
35%inclusion128 decks362 decks
28%synergy
Orzhov Basilica
35%inclusion128 decks362 decks
19%synergy
Isolated Chapel
35%inclusion126 decks362 decks
-3%synergy
Tainted Isle
33%inclusion120 decks362 decks
27%synergy
Sunken Hollow
33%inclusion120 decks362 decks
-6%synergy
Valgavoth's Lair
33%inclusion118 decks362 decks
30%synergy
Drowned Catacomb
31%inclusion113 decks362 decks
-4%synergy
Ash Barrens
28%inclusion103 decks362 decks
18%synergy
Godless Shrine
25%inclusion90 decks362 decks
-25%synergy
Raffine's Tower
24%inclusion87 decks362 decks
-17%synergy
Watery Grave
23%inclusion84 decks362 decks
-26%synergy
Hallowed Fountain
22%inclusion81 decks362 decks
-27%synergy
Flooded Strand
20%inclusion72 decks362 decks
-18%synergy
Shadowy Backstreet
19%inclusion68 decks362 decks
6%synergy
Meticulous Archive
19%inclusion68 decks362 decks
5%synergy
Sea of Clouds
19%inclusion68 decks362 decks
-17%synergy
Polluted Delta
19%inclusion67 decks362 decks
-19%synergy
Undercity Sewers
18%inclusion64 decks362 decks
4%synergy
Vault of Champions
17%inclusion62 decks362 decks
-16%synergy
Marsh Flats
17%inclusion61 decks362 decks
-19%synergy
Floodfarm Verge
17%inclusion60 decks362 decks
5%synergy
Gloomlake Verge
16%inclusion57 decks362 decks
5%synergy
Shipwreck Marsh
15%inclusion55 decks362 decks
-6%synergy
Thriving Isle
15%inclusion55 decks362 decks
11%synergy
Thriving Moor
15%inclusion54 decks362 decks
10%synergy
Morphic Pool
15%inclusion54 decks362 decks
-20%synergy
Thriving Heath
15%inclusion53 decks362 decks
10%synergy
Skycloud Expanse
14%inclusion52 decks362 decks
0%synergy
Deserted Beach
14%inclusion50 decks362 decks
-7%synergy
Darkwater Catacombs
13%inclusion48 decks362 decks
-1%synergy
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