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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Sorceries
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Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
Back to Top
Noggle the Mind
10%inclusion7 decks69 decks
9%synergy
Retro-Mutation
3.3%inclusion1 decks30 decks
3%synergy
Dimensional Exile
3.0%inclusion1 decks33 decks
3%synergy
Mornsong Aria
2.8%inclusion2 decks72 decks
2%synergy
Killian, Decisive Mentor
1.9%inclusion1 decks53 decks
2%synergy
High Synergy Cards
Inquisitive Glimmer
77%inclusion313 decks407 decks
70%synergy
Mesa Enchantress
75%inclusion307 decks407 decks
66%synergy
Starfield Mystic
70%inclusion284 decks407 decks
63%synergy
Entity Tracker
65%inclusion266 decks407 decks
59%synergy
Demon of Fate's Design
62%inclusion252 decks407 decks
56%synergy
Doomwake Giant
61%inclusion247 decks407 decks
55%synergy
Fear of Sleep Paralysis
57%inclusion232 decks407 decks
52%synergy
Ripples of Undeath
53%inclusion216 decks407 decks
50%synergy
Gravebreaker Lamia
51%inclusion208 decks407 decks
50%synergy
Scrabbling Skullcrab
50%inclusion202 decks407 decks
49%synergy
Top Cards
Secret Arcade // Dusty Parlor
52%inclusion211 decks407 decks
47%synergy
Sigil of the Empty Throne
52%inclusion210 decks407 decks
46%synergy
Ondu Spiritdancer
50%inclusion204 decks407 decks
44%synergy
Swords to Plowshares
49%inclusion201 decks407 decks
-19%synergy
Mirrormade
49%inclusion199 decks407 decks
39%synergy
Sphere of Safety
48%inclusion197 decks407 decks
39%synergy
Victor, Valgavoth's Seneschal
46%inclusion189 decks407 decks
44%synergy
Redress Fate
45%inclusion183 decks407 decks
39%synergy
Fear of Impostors
42%inclusion171 decks407 decks
41%synergy
Grasp of Fate
41%inclusion166 decks407 decks
35%synergy
Creatures
Overlord of the Floodpits
39%inclusion159 decks407 decks
35%synergy
Soaring Lightbringer
38%inclusion154 decks407 decks
33%synergy
Ghostly Dancers
38%inclusion154 decks407 decks
35%synergy
Overlord of the Balemurk
34%inclusion139 decks407 decks
32%synergy
Moon-Blessed Cleric
31%inclusion128 decks407 decks
27%synergy
Aminatou, Veil Piercer
31%inclusion127 decks407 decks
30%synergy
Silent Hallcreeper
30%inclusion124 decks407 decks
26%synergy
Heliod, the Radiant Dawn
30%inclusion121 decks407 decks
26%synergy
Zur, Eternal Schemer
29%inclusion119 decks407 decks
26%synergy
Archon of Sun's Grace
29%inclusion116 decks407 decks
24%synergy
Enduring Curiosity
27%inclusion111 decks407 decks
19%synergy
Grim Guardian
27%inclusion110 decks407 decks
25%synergy
Athreos, Shroud-Veiled
25%inclusion102 decks407 decks
21%synergy
Zur the Enchanter
22%inclusion91 decks407 decks
17%synergy
Archetype of Imagination
22%inclusion90 decks407 decks
17%synergy
Skullsnap Nuisance
22%inclusion89 decks407 decks
21%synergy
Mindwrack Harpy
21%inclusion84 decks407 decks
20%synergy
Sage of Mysteries
20%inclusion83 decks407 decks
20%synergy
Ancient Cellarspawn
20%inclusion80 decks407 decks
17%synergy
Alseid of Life's Bounty
19%inclusion76 decks407 decks
17%synergy
Overlord of the Mistmoors
17%inclusion70 decks407 decks
15%synergy
Balemurk Leech
16%inclusion66 decks407 decks
16%synergy
Spirited Companion
15%inclusion62 decks407 decks
13%synergy
Auramancer
15%inclusion60 decks407 decks
12%synergy
Nightmare Shepherd
15%inclusion60 decks407 decks
12%synergy
Gremlin Tamer
14%inclusion56 decks407 decks
13%synergy
Fear of Infinity
13%inclusion54 decks407 decks
13%synergy
Solemn Simulacrum
13%inclusion53 decks407 decks
-1%synergy
Nashi, Searcher in the Dark
13%inclusion53 decks407 decks
13%synergy
Summon: Yojimbo
12%inclusion21 decks176 decks
11%synergy
Starnheim Courser
10%inclusion40 decks407 decks
6%synergy
Metamorphosis Fanatic
8.6%inclusion35 decks407 decks
4%synergy
Arvinox, the Mind Flail
8.4%inclusion34 decks407 decks
7%synergy
Millikin
8.4%inclusion34 decks407 decks
8%synergy
Creeping Peeper
7.9%inclusion32 decks407 decks
8%synergy
Fear of Surveillance
7.9%inclusion32 decks407 decks
8%synergy
Stenn, Paranoid Partisan
7.1%inclusion29 decks407 decks
6%synergy
Appendage Amalgam
7.1%inclusion29 decks407 decks
7%synergy
Sun Titan
7.1%inclusion29 decks407 decks
-1%synergy
Summon: Primal Odin
6.8%inclusion12 decks176 decks
3%synergy
Burnished Hart
6.4%inclusion26 decks407 decks
3%synergy
Enduring Innocence
6.4%inclusion26 decks407 decks
5%synergy
Witch Enchanter
6.1%inclusion25 decks407 decks
-1%synergy
Fear of Failed Tests
6.1%inclusion25 decks407 decks
6%synergy
Phenomenon Investigators
6.1%inclusion25 decks407 decks
6%synergy
Stitcher's Supplier
5.9%inclusion24 decks407 decks
5%synergy
Deranged Assistant
5.9%inclusion24 decks407 decks
6%synergy
Ghostly Keybearer
5.9%inclusion24 decks407 decks
6%synergy
Braids, Arisen Nightmare
5.4%inclusion22 decks407 decks
4%synergy
Ashiok's Reaper
5.4%inclusion22 decks407 decks
5%synergy
Instants
Arcane Denial
35%inclusion142 decks407 decks
15%synergy
Thirst for Meaning
29%inclusion120 decks407 decks
28%synergy
Path to Exile
28%inclusion112 decks407 decks
-15%synergy
Otherworldly Gaze
24%inclusion98 decks407 decks
22%synergy
Counterspell
24%inclusion97 decks407 decks
-18%synergy
Inkshield
20%inclusion83 decks407 decks
11%synergy
Void Rend
20%inclusion82 decks407 decks
-14%synergy
Frantic Search
16%inclusion67 decks407 decks
-1%synergy
An Offer You Can't Refuse
16%inclusion67 decks407 decks
-11%synergy
Negate
15%inclusion61 decks407 decks
-1%synergy
Utter End
15%inclusion60 decks407 decks
8%synergy
Brainstorm
12%inclusion50 decks407 decks
-5%synergy
Dark Ritual
10%inclusion40 decks407 decks
-10%synergy
Dovin's Veto
9.3%inclusion38 decks407 decks
-16%synergy
Return to Dust
9.1%inclusion37 decks407 decks
6%synergy
Generous Gift
7.6%inclusion31 decks407 decks
-7%synergy
Fact or Fiction
7.1%inclusion29 decks407 decks
3%synergy
Fell the Profane
6.9%inclusion28 decks407 decks
-2%synergy
Sink into Stupor
6.9%inclusion28 decks407 decks
-6%synergy
Entomb
6.6%inclusion27 decks407 decks
0%synergy
Swan Song
6.1%inclusion25 decks407 decks
-14%synergy
Unwanted Remake
5.9%inclusion24 decks407 decks
5%synergy
Anguished Unmaking
5.7%inclusion23 decks407 decks
-20%synergy
Telling Time
5.2%inclusion21 decks407 decks
3%synergy
Withering Torment
5.2%inclusion21 decks407 decks
3%synergy
Sorceries
Sevinne's Reclamation
31%inclusion127 decks407 decks
22%synergy
Time Wipe
25%inclusion103 decks407 decks
19%synergy
Extinguish All Hope
25%inclusion102 decks407 decks
23%synergy
Dance of the Manse
24%inclusion97 decks407 decks
20%synergy
Singularity Rupture
18%inclusion26 decks145 decks
16%synergy
Windfall
16%inclusion65 decks407 decks
3%synergy
Resurgent Belief
12%inclusion49 decks407 decks
10%synergy
Damn
12%inclusion48 decks407 decks
-9%synergy
Glimpse the Unthinkable
11%inclusion44 decks407 decks
10%synergy
Reanimate
11%inclusion43 decks407 decks
-6%synergy
Space-Time Anomaly
10%inclusion15 decks143 decks
9%synergy
Terminus
10%inclusion41 decks407 decks
6%synergy
Ponder
9.3%inclusion38 decks407 decks
0%synergy
Read the Bones
8.1%inclusion33 decks407 decks
4%synergy
Brilliant Restoration
7.9%inclusion32 decks407 decks
6%synergy
Toxic Deluge
7.1%inclusion29 decks407 decks
-12%synergy
Austere Command
5.7%inclusion23 decks407 decks
-3%synergy
Diabolic Vision
5.7%inclusion23 decks407 decks
3%synergy
Commune with Evil
5.4%inclusion22 decks407 decks
5%synergy
Open the Vaults
5.4%inclusion22 decks407 decks
4%synergy
Idyllic Tutor
5.4%inclusion22 decks407 decks
1%synergy
Portent
5.4%inclusion22 decks407 decks
2%synergy
Utility Artifacts
Cloud Key
12%inclusion50 decks407 decks
9%synergy
Keys to the House
8.9%inclusion36 decks406 decks
9%synergy
Wayfarer's Bauble
8.8%inclusion36 decks407 decks
1%synergy
Lightning Greaves
8.4%inclusion34 decks407 decks
-14%synergy
Mesmeric Orb
7.4%inclusion30 decks407 decks
6%synergy
Perpetual Timepiece
5.4%inclusion22 decks407 decks
5%synergy
Swiftfoot Boots
5.4%inclusion22 decks407 decks
-19%synergy
Whip of Erebos
5.2%inclusion21 decks407 decks
3%synergy
Enchantments
Dress Down
41%inclusion165 decks407 decks
38%synergy
Animate Dead
40%inclusion163 decks407 decks
30%synergy
Seal of Cleansing
40%inclusion162 decks407 decks
38%synergy
Defiled Crypt // Cadaver Lab
38%inclusion155 decks406 decks
37%synergy
Cemetery Tampering
38%inclusion155 decks407 decks
37%synergy
Monologue Tax
37%inclusion152 decks407 decks
31%synergy
Cacophony Unleashed
34%inclusion140 decks407 decks
33%synergy
Propaganda
33%inclusion135 decks407 decks
5%synergy
Shark Typhoon
32%inclusion132 decks407 decks
27%synergy
Bottomless Pool // Locker Room
31%inclusion125 decks407 decks
29%synergy
Timely Ward
30%inclusion124 decks407 decks
25%synergy
Estrid's Invocation
30%inclusion124 decks407 decks
26%synergy
Amphibian Downpour
30%inclusion123 decks407 decks
26%synergy
Ethereal Armor
29%inclusion120 decks407 decks
25%synergy
All That Glitters
28%inclusion113 decks407 decks
19%synergy
Extravagant Replication
27%inclusion111 decks407 decks
22%synergy
Polluted Cistern // Dim Oubliette
27%inclusion110 decks407 decks
26%synergy
Ghostly Prison
27%inclusion108 decks407 decks
4%synergy
Cramped Vents // Access Maze
25%inclusion103 decks407 decks
23%synergy
The Eldest Reborn
25%inclusion103 decks407 decks
23%synergy
Stillness in Motion
25%inclusion51 decks203 decks
25%synergy
Mystic Remora
25%inclusion101 decks407 decks
4%synergy
Necromancy
25%inclusion100 decks407 decks
20%synergy
The Tale of Tamiyo
24%inclusion97 decks407 decks
23%synergy
Darksteel Mutation
23%inclusion92 decks407 decks
17%synergy
Restricted Office // Lecture Hall
22%inclusion91 decks407 decks
20%synergy
Starfield of Nyx
22%inclusion90 decks407 decks
18%synergy
Mirror Room // Fractured Realm
21%inclusion87 decks407 decks
19%synergy
Imprisoned in the Moon
20%inclusion80 decks407 decks
13%synergy
Central Elevator // Promising Stairs
19%inclusion78 decks407 decks
19%synergy
Sheltered by Ghosts
19%inclusion78 decks407 decks
17%synergy
Hallowed Haunting
18%inclusion74 decks407 decks
16%synergy
Seal of Removal
18%inclusion73 decks407 decks
17%synergy
Blind Obedience
18%inclusion72 decks407 decks
6%synergy
Phyrexian Arena
18%inclusion72 decks407 decks
4%synergy
Secrets of the Dead
17%inclusion71 decks407 decks
17%synergy
One with the Multiverse
17%inclusion70 decks407 decks
12%synergy
Derelict Attic // Widow's Walk
17%inclusion68 decks405 decks
16%synergy
Dazzling Theater // Prop Room
17%inclusion68 decks406 decks
15%synergy
Meat Locker // Drowned Diner
17%inclusion67 decks405 decks
16%synergy
Cast Out
16%inclusion67 decks407 decks
14%synergy
Unable to Scream
16%inclusion65 decks407 decks
15%synergy
Underwater Tunnel // Slimy Aquarium
15%inclusion60 decks406 decks
14%synergy
Copy Enchantment
14%inclusion59 decks407 decks
10%synergy
Nowhere to Run
14%inclusion57 decks407 decks
13%synergy
Spirit-Sister's Call
14%inclusion56 decks407 decks
13%synergy
Court of Cunning
13%inclusion54 decks407 decks
12%synergy
Surgical Suite // Hospital Room
13%inclusion53 decks407 decks
13%synergy
Funeral Room // Awakening Hall
13%inclusion53 decks407 decks
12%synergy
Teval's Judgment
12%inclusion25 decks206 decks
11%synergy
Battles
Invasion of Theros
11%inclusion44 decks407 decks
9%synergy
Utility Lands
Hall of Heliod's Generosity
59%inclusion239 decks407 decks
46%synergy
Bojuka Bog
48%inclusion196 decks407 decks
21%synergy
Halimar Depths
19%inclusion79 decks407 decks
15%synergy
Reliquary Tower
10%inclusion42 decks407 decks
-24%synergy
Cephalid Coliseum
8.6%inclusion35 decks407 decks
5%synergy
Nephalia Drownyard
5.9%inclusion24 decks407 decks
5%synergy
Takenuma, Abandoned Mire
5.9%inclusion24 decks407 decks
-1%synergy
Adagia, Windswept Bastion
5.5%inclusion8 decks145 decks
3%synergy
Otawara, Soaring City
5.4%inclusion22 decks407 decks
-14%synergy
Mana Artifacts
Arcane Signet
88%inclusion358 decks407 decks
0%synergy
Sol Ring
80%inclusion326 decks407 decks
-10%synergy
Azorius Signet
54%inclusion220 decks407 decks
23%synergy
Orzhov Signet
51%inclusion207 decks407 decks
18%synergy
Talisman of Dominance
41%inclusion168 decks407 decks
-8%synergy
Talisman of Progress
39%inclusion160 decks407 decks
-4%synergy
Talisman of Hierarchy
35%inclusion142 decks407 decks
-9%synergy
Dimir Signet
35%inclusion141 decks407 decks
3%synergy
Fellwar Stone
25%inclusion100 decks407 decks
-9%synergy
Commander's Sphere
24%inclusion99 decks407 decks
6%synergy
Mind Stone
24%inclusion97 decks407 decks
11%synergy
Chromatic Lantern
7.6%inclusion31 decks407 decks
-5%synergy
Lands
Island
99%inclusion402 decks407 decks
6%synergy
Plains
98%inclusion397 decks407 decks
6%synergy
Swamp
97%inclusion394 decks407 decks
5%synergy
Command Tower
93%inclusion379 decks407 decks
1%synergy
Arcane Sanctum
72%inclusion292 decks407 decks
17%synergy
Caves of Koilos
62%inclusion252 decks407 decks
26%synergy
Adarkar Wastes
62%inclusion251 decks407 decks
30%synergy
Underground River
54%inclusion218 decks407 decks
20%synergy
Exotic Orchard
49%inclusion200 decks407 decks
-10%synergy
Obscura Storefront
45%inclusion182 decks407 decks
35%synergy
Temple of Enlightenment
43%inclusion174 decks407 decks
27%synergy
Evolving Wilds
42%inclusion172 decks407 decks
17%synergy
Terramorphic Expanse
42%inclusion171 decks407 decks
26%synergy
Temple of Silence
42%inclusion170 decks407 decks
23%synergy
Temple of Deceit
40%inclusion163 decks407 decks
22%synergy
Azorius Chancery
38%inclusion153 decks407 decks
24%synergy
Glacial Fortress
37%inclusion151 decks407 decks
-4%synergy
Dimir Aqueduct
37%inclusion151 decks407 decks
24%synergy
Prairie Stream
37%inclusion151 decks407 decks
-4%synergy
Tainted Field
35%inclusion143 decks407 decks
28%synergy
Contaminated Landscape
35%inclusion141 decks407 decks
21%synergy
Isolated Chapel
34%inclusion139 decks407 decks
-6%synergy
Orzhov Basilica
33%inclusion135 decks407 decks
18%synergy
Sunken Hollow
33%inclusion134 decks407 decks
-7%synergy
Tainted Isle
33%inclusion133 decks407 decks
26%synergy
Drowned Catacomb
32%inclusion129 decks407 decks
-5%synergy
Valgavoth's Lair
31%inclusion126 decks407 decks
28%synergy
Ash Barrens
27%inclusion108 decks407 decks
16%synergy
Godless Shrine
25%inclusion103 decks407 decks
-26%synergy
Raffine's Tower
25%inclusion102 decks407 decks
-16%synergy
Hallowed Fountain
25%inclusion101 decks407 decks
-25%synergy
Watery Grave
25%inclusion100 decks407 decks
-26%synergy
Flooded Strand
18%inclusion75 decks407 decks
-20%synergy
Sea of Clouds
18%inclusion75 decks407 decks
-17%synergy
Shadowy Backstreet
18%inclusion73 decks407 decks
5%synergy
Meticulous Archive
18%inclusion73 decks407 decks
4%synergy
Polluted Delta
18%inclusion72 decks407 decks
-20%synergy
Undercity Sewers
17%inclusion71 decks407 decks
3%synergy
Vault of Champions
17%inclusion68 decks407 decks
-16%synergy
Floodfarm Verge
17%inclusion68 decks407 decks
6%synergy
Gloomlake Verge
16%inclusion66 decks407 decks
5%synergy
Marsh Flats
16%inclusion65 decks407 decks
-20%synergy
Shipwreck Marsh
15%inclusion61 decks407 decks
-6%synergy
Skycloud Expanse
15%inclusion61 decks407 decks
0%synergy
Morphic Pool
15%inclusion60 decks407 decks
-19%synergy
Thriving Isle
14%inclusion59 decks407 decks
10%synergy
Thriving Moor
14%inclusion59 decks407 decks
10%synergy
Deserted Beach
14%inclusion59 decks407 decks
-6%synergy
Thriving Heath
14%inclusion58 decks407 decks
10%synergy
Darkwater Catacombs
14%inclusion57 decks407 decks
-1%synergy
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