The Master of Keys (Commander) - Upgraded

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
Utility Artifacts
Enchantments
Battles
Utility Lands
Mana Artifacts
Lands
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Chakra Meditation
1.8%inclusion2 decks109 decks
2%synergy
The Legend of Yangchen
1.7%inclusion2 decks116 decks
1%synergy
Abandoned Air Temple
0.9%inclusion1 decks107 decks
0%synergy
Agna Qel'a
0.9%inclusion1 decks109 decks
0%synergy
Serpent's Pass
0.9%inclusion1 decks112 decks
1%synergy
High Synergy Cards
Ripples of Undeath
73%inclusion301 decks410 decks
71%synergy
Inquisitive Glimmer
78%inclusion321 decks410 decks
71%synergy
Entity Tracker
71%inclusion292 decks410 decks
65%synergy
Starfield Mystic
67%inclusion274 decks410 decks
60%synergy
Gravebreaker Lamia
59%inclusion242 decks410 decks
58%synergy
Animate Dead
67%inclusion276 decks410 decks
58%synergy
Mesa Enchantress
66%inclusion272 decks410 decks
57%synergy
Demon of Fate's Design
59%inclusion243 decks410 decks
54%synergy
Dress Down
55%inclusion227 decks410 decks
53%synergy
Scrabbling Skullcrab
53%inclusion219 decks410 decks
52%synergy
Top Cards
Fear of Sleep Paralysis
57%inclusion234 decks410 decks
51%synergy
Doomwake Giant
54%inclusion222 decks410 decks
48%synergy
Mystic Remora
53%inclusion217 decks410 decks
32%synergy
Necromancy
52%inclusion212 decks410 decks
47%synergy
Sphere of Safety
52%inclusion212 decks410 decks
42%synergy
Overlord of the Floodpits
51%inclusion209 decks410 decks
47%synergy
Swords to Plowshares
51%inclusion208 decks410 decks
-17%synergy
Secret Arcade // Dusty Parlor
50%inclusion205 decks410 decks
45%synergy
Mirrormade
49%inclusion202 decks410 decks
39%synergy
Sevinne's Reclamation
48%inclusion195 decks410 decks
39%synergy
Game Changers
Smothering Tithe
39%inclusion159 decks410 decks
7%synergy
Rhystic Study
29%inclusion118 decks410 decks
-4%synergy
Enlightened Tutor
12%inclusion49 decks410 decks
-8%synergy
Gifts Ungiven
9.3%inclusion38 decks410 decks
7%synergy
Necropotence
7.8%inclusion32 decks410 decks
1%synergy
Cyclonic Rift
6.6%inclusion27 decks410 decks
-18%synergy
Serra's Sanctum
6.3%inclusion26 decks410 decks
5%synergy
Demonic Tutor
5.4%inclusion22 decks410 decks
-16%synergy
Teferi's Protection
5.1%inclusion21 decks410 decks
-12%synergy
Creatures
Overlord of the Balemurk
48%inclusion195 decks410 decks
46%synergy
Victor, Valgavoth's Seneschal
47%inclusion193 decks410 decks
45%synergy
Fear of Impostors
46%inclusion189 decks410 decks
45%synergy
Ondu Spiritdancer
45%inclusion186 decks410 decks
39%synergy
Zur, Eternal Schemer
45%inclusion183 decks410 decks
41%synergy
Silent Hallcreeper
34%inclusion139 decks410 decks
30%synergy
Zur the Enchanter
32%inclusion133 decks410 decks
27%synergy
Ghostly Dancers
31%inclusion126 decks410 decks
28%synergy
Enduring Curiosity
27%inclusion112 decks410 decks
20%synergy
Heliod, the Radiant Dawn
26%inclusion107 decks410 decks
22%synergy
Moon-Blessed Cleric
24%inclusion99 decks410 decks
19%synergy
Soaring Lightbringer
24%inclusion98 decks410 decks
19%synergy
Grim Guardian
23%inclusion95 decks410 decks
21%synergy
Archon of Sun's Grace
22%inclusion91 decks410 decks
17%synergy
Abdel Adrian, Gorion's Ward
20%inclusion84 decks410 decks
19%synergy
Sage of Mysteries
17%inclusion69 decks410 decks
17%synergy
Mindwrack Harpy
16%inclusion67 decks410 decks
16%synergy
Overlord of the Mistmoors
16%inclusion66 decks410 decks
14%synergy
Aminatou, Veil Piercer
16%inclusion65 decks410 decks
14%synergy
Archetype of Imagination
15%inclusion61 decks410 decks
10%synergy
Alseid of Life's Bounty
14%inclusion59 decks410 decks
13%synergy
Athreos, Shroud-Veiled
13%inclusion54 decks410 decks
9%synergy
Lotho, Corrupt Shirriff
13%inclusion53 decks410 decks
-4%synergy
Balemurk Leech
13%inclusion52 decks410 decks
12%synergy
Ancient Cellarspawn
13%inclusion52 decks410 decks
9%synergy
Hullbreaker Horror
13%inclusion52 decks410 decks
7%synergy
Hedron Crab
11%inclusion45 decks410 decks
10%synergy
Sun Titan
11%inclusion45 decks410 decks
2%synergy
Skullsnap Nuisance
10%inclusion43 decks410 decks
10%synergy
Ledger Shredder
10%inclusion41 decks410 decks
1%synergy
Witch Enchanter
10%inclusion40 decks410 decks
3%synergy
Lurrus of the Dream-Den
10%inclusion39 decks410 decks
8%synergy
Nashi, Searcher in the Dark
10%inclusion39 decks410 decks
9%synergy
Esper Sentinel
9.3%inclusion38 decks410 decks
-19%synergy
Gremlin Tamer
9.3%inclusion38 decks410 decks
8%synergy
Solemn Simulacrum
8.0%inclusion33 decks410 decks
-7%synergy
Spirited Companion
7.8%inclusion32 decks410 decks
6%synergy
Valgavoth, Terror Eater
7.1%inclusion29 decks410 decks
4%synergy
Nightmare Shepherd
7.1%inclusion29 decks410 decks
5%synergy
Summon: Yojimbo
6.9%inclusion20 decks288 decks
6%synergy
Valley Floodcaller
6.8%inclusion28 decks410 decks
3%synergy
Fear of Infinity
6.6%inclusion27 decks410 decks
6%synergy
Grand Abolisher
6.6%inclusion27 decks410 decks
-8%synergy
Emet-Selch of the Third Seat
6.5%inclusion19 decks291 decks
-3%synergy
Auramancer
6.3%inclusion26 decks410 decks
3%synergy
Enduring Tenacity
6.3%inclusion26 decks410 decks
-1%synergy
Metamorphosis Fanatic
5.9%inclusion24 decks410 decks
1%synergy
Stenn, Paranoid Partisan
5.9%inclusion24 decks410 decks
4%synergy
Starnheim Courser
5.9%inclusion24 decks410 decks
2%synergy
Laboratory Maniac
5.6%inclusion23 decks410 decks
2%synergy
Instants
Arcane Denial
34%inclusion141 decks410 decks
14%synergy
Counterspell
34%inclusion138 decks410 decks
-8%synergy
An Offer You Can't Refuse
29%inclusion119 decks410 decks
3%synergy
Path to Exile
27%inclusion109 decks410 decks
-15%synergy
Dark Ritual
26%inclusion107 decks410 decks
7%synergy
Entomb
26%inclusion105 decks410 decks
19%synergy
Void Rend
19%inclusion78 decks410 decks
-14%synergy
Inkshield
17%inclusion70 decks410 decks
8%synergy
Thirst for Meaning
16%inclusion67 decks410 decks
15%synergy
Swan Song
16%inclusion66 decks410 decks
-3%synergy
Frantic Search
16%inclusion64 decks410 decks
-1%synergy
Dovin's Veto
16%inclusion64 decks410 decks
-9%synergy
Sink into Stupor
15%inclusion62 decks410 decks
3%synergy
Negate
13%inclusion55 decks410 decks
-3%synergy
Otherworldly Gaze
13%inclusion52 decks410 decks
10%synergy
Fell the Profane
13%inclusion52 decks410 decks
4%synergy
Mana Drain
11%inclusion47 decks410 decks
-6%synergy
Brainstorm
10%inclusion43 decks410 decks
-7%synergy
Anguished Unmaking
9.3%inclusion38 decks410 decks
-15%synergy
Faithful Mending
6.3%inclusion26 decks410 decks
2%synergy
Generous Gift
6.3%inclusion26 decks410 decks
-8%synergy
Fact or Fiction
6.1%inclusion25 decks410 decks
2%synergy
Utter End
5.9%inclusion24 decks410 decks
-1%synergy
Waterlogged Teachings
5.4%inclusion22 decks410 decks
1%synergy
Return to Dust
5.1%inclusion21 decks410 decks
1%synergy
Cabal Ritual
5.1%inclusion21 decks410 decks
2%synergy
Sorceries
Redress Fate
36%inclusion147 decks410 decks
30%synergy
Windfall
25%inclusion104 decks410 decks
12%synergy
Singularity Rupture
23%inclusion55 decks243 decks
20%synergy
Reanimate
22%inclusion92 decks410 decks
7%synergy
Extinguish All Hope
20%inclusion81 decks410 decks
18%synergy
Dance of the Manse
19%inclusion78 decks410 decks
15%synergy
Time Wipe
16%inclusion65 decks410 decks
9%synergy
Toxic Deluge
15%inclusion61 decks410 decks
-5%synergy
Idyllic Tutor
15%inclusion60 decks410 decks
10%synergy
Damn
14%inclusion59 decks410 decks
-6%synergy
Glimpse the Unthinkable
14%inclusion56 decks410 decks
13%synergy
Resurgent Belief
11%inclusion46 decks410 decks
9%synergy
Supreme Verdict
11%inclusion45 decks410 decks
-4%synergy
Demonic Counsel
11%inclusion44 decks410 decks
10%synergy
Space-Time Anomaly
10%inclusion23 decks237 decks
8%synergy
Buried Alive
9.3%inclusion38 decks410 decks
5%synergy
Replenish
8.5%inclusion35 decks410 decks
7%synergy
Farewell
7.8%inclusion32 decks410 decks
-5%synergy
Unmarked Grave
7.6%inclusion31 decks410 decks
6%synergy
Ponder
6.8%inclusion28 decks410 decks
-2%synergy
Lively Dirge
5.9%inclusion24 decks410 decks
5%synergy
Traumatize
5.6%inclusion23 decks410 decks
5%synergy
Open the Vaults
5.1%inclusion21 decks410 decks
4%synergy
Utility Artifacts
Mesmeric Orb
19%inclusion76 decks410 decks
17%synergy
Cloud Key
13%inclusion52 decks410 decks
9%synergy
Lightning Greaves
8.8%inclusion36 decks410 decks
-14%synergy
Wayfarer's Bauble
7.8%inclusion32 decks410 decks
0%synergy
Swiftfoot Boots
5.9%inclusion24 decks410 decks
-18%synergy
Keys to the House
5.4%inclusion22 decks410 decks
5%synergy
Crucible of Worlds
5.1%inclusion21 decks410 decks
4%synergy
Enchantments
Amphibian Downpour
46%inclusion189 decks410 decks
42%synergy
Propaganda
45%inclusion184 decks410 decks
19%synergy
Grasp of Fate
44%inclusion179 decks410 decks
37%synergy
Seal of Cleansing
42%inclusion174 decks410 decks
41%synergy
Cemetery Tampering
42%inclusion171 decks410 decks
41%synergy
Sigil of the Empty Throne
41%inclusion167 decks410 decks
35%synergy
Estrid's Invocation
37%inclusion150 decks410 decks
32%synergy
Ghostly Prison
36%inclusion148 decks410 decks
15%synergy
Blind Obedience
34%inclusion140 decks410 decks
22%synergy
Cacophony Unleashed
33%inclusion134 decks410 decks
31%synergy
Starfield of Nyx
32%inclusion131 decks410 decks
28%synergy
Monologue Tax
29%inclusion120 decks410 decks
23%synergy
Dance of the Dead
28%inclusion115 decks410 decks
26%synergy
The Tale of Tamiyo
27%inclusion112 decks410 decks
27%synergy
Stillness in Motion
25%inclusion86 decks346 decks
24%synergy
Darksteel Mutation
24%inclusion99 decks410 decks
18%synergy
The Meathook Massacre
24%inclusion97 decks410 decks
20%synergy
Seal of Removal
24%inclusion97 decks410 decks
23%synergy
Phyrexian Arena
23%inclusion94 decks410 decks
9%synergy
Defiled Crypt // Cadaver Lab
23%inclusion93 decks410 decks
22%synergy
Timely Ward
22%inclusion89 decks410 decks
17%synergy
Extravagant Replication
21%inclusion87 decks410 decks
16%synergy
Polluted Cistern // Dim Oubliette
21%inclusion87 decks410 decks
21%synergy
Out of the Tombs
21%inclusion85 decks410 decks
20%synergy
Shark Typhoon
21%inclusion85 decks410 decks
15%synergy
Black Market Connections
20%inclusion84 decks410 decks
7%synergy
All That Glitters
20%inclusion83 decks410 decks
11%synergy
Sheltered by Ghosts
20%inclusion83 decks410 decks
18%synergy
Greater Auramancy
19%inclusion79 decks410 decks
15%synergy
Ethereal Armor
19%inclusion77 decks410 decks
14%synergy
Imprisoned in the Moon
18%inclusion75 decks410 decks
12%synergy
Copy Enchantment
18%inclusion75 decks410 decks
14%synergy
Touch the Spirit Realm
18%inclusion73 decks410 decks
15%synergy
Hallowed Haunting
16%inclusion67 decks410 decks
14%synergy
Authority of the Consuls
16%inclusion67 decks410 decks
5%synergy
The Eldest Reborn
16%inclusion66 decks410 decks
14%synergy
Bottomless Pool // Locker Room
16%inclusion66 decks410 decks
14%synergy
Mirror Room // Fractured Realm
16%inclusion66 decks410 decks
14%synergy
Restricted Office // Lecture Hall
16%inclusion65 decks410 decks
14%synergy
Leyline of Anticipation
16%inclusion64 decks410 decks
11%synergy
Secrets of the Dead
15%inclusion61 decks410 decks
15%synergy
Static Prison
15%inclusion61 decks410 decks
14%synergy
Central Elevator // Promising Stairs
14%inclusion59 decks410 decks
14%synergy
One with the Multiverse
13%inclusion55 decks410 decks
9%synergy
Court of Cunning
13%inclusion55 decks410 decks
12%synergy
Nowhere to Run
13%inclusion55 decks410 decks
12%synergy
Cramped Vents // Access Maze
13%inclusion54 decks410 decks
10%synergy
Teval's Judgment
13%inclusion46 decks352 decks
12%synergy
Land Tax
13%inclusion52 decks410 decks
7%synergy
Oubliette
12%inclusion50 decks410 decks
11%synergy
Battles
Invasion of Theros
9.3%inclusion38 decks410 decks
7%synergy
Utility Lands
Hall of Heliod's Generosity
65%inclusion268 decks410 decks
52%synergy
Bojuka Bog
42%inclusion173 decks410 decks
15%synergy
Cephalid Coliseum
20%inclusion81 decks410 decks
16%synergy
Otawara, Soaring City
18%inclusion73 decks410 decks
-1%synergy
Takenuma, Abandoned Mire
16%inclusion67 decks410 decks
10%synergy
Reliquary Tower
12%inclusion50 decks410 decks
-21%synergy
Halimar Depths
10%inclusion42 decks410 decks
5%synergy
Urborg, Tomb of Yawgmoth
8.3%inclusion34 decks410 decks
-5%synergy
Urza's Saga
5.6%inclusion23 decks410 decks
-6%synergy
Nephalia Drownyard
5.1%inclusion21 decks410 decks
5%synergy
Rogue's Passage
5.1%inclusion21 decks410 decks
-4%synergy
Mana Artifacts
Arcane Signet
89%inclusion363 decks410 decks
1%synergy
Sol Ring
88%inclusion362 decks410 decks
-2%synergy
Talisman of Progress
51%inclusion208 decks410 decks
8%synergy
Talisman of Dominance
50%inclusion206 decks410 decks
1%synergy
Talisman of Hierarchy
46%inclusion190 decks410 decks
3%synergy
Azorius Signet
40%inclusion163 decks410 decks
7%synergy
Orzhov Signet
40%inclusion162 decks410 decks
5%synergy
Fellwar Stone
32%inclusion130 decks410 decks
-2%synergy
Dimir Signet
27%inclusion112 decks410 decks
-5%synergy
Mind Stone
16%inclusion65 decks410 decks
3%synergy
Commander's Sphere
13%inclusion53 decks410 decks
-6%synergy
Chromatic Lantern
7.1%inclusion29 decks410 decks
-6%synergy
Thought Vessel
5.1%inclusion21 decks410 decks
-19%synergy
Lands
Swamp
96%inclusion394 decks410 decks
5%synergy
Plains
96%inclusion394 decks410 decks
5%synergy
Island
96%inclusion394 decks410 decks
4%synergy
Command Tower
95%inclusion391 decks410 decks
3%synergy
Caves of Koilos
62%inclusion256 decks410 decks
27%synergy
Arcane Sanctum
60%inclusion246 decks410 decks
5%synergy
Adarkar Wastes
58%inclusion238 decks410 decks
27%synergy
Underground River
53%inclusion218 decks410 decks
21%synergy
Exotic Orchard
51%inclusion209 decks410 decks
-8%synergy
Godless Shrine
50%inclusion207 decks410 decks
0%synergy
Watery Grave
50%inclusion207 decks410 decks
1%synergy
Hallowed Fountain
48%inclusion196 decks410 decks
-1%synergy
Flooded Strand
44%inclusion182 decks410 decks
7%synergy
Raffine's Tower
44%inclusion179 decks410 decks
3%synergy
Polluted Delta
43%inclusion177 decks410 decks
6%synergy
Glacial Fortress
39%inclusion161 decks410 decks
0%synergy
Isolated Chapel
39%inclusion160 decks410 decks
1%synergy
Marsh Flats
37%inclusion152 decks410 decks
1%synergy
Prairie Stream
34%inclusion139 decks410 decks
-7%synergy
Valgavoth's Lair
33%inclusion136 decks410 decks
30%synergy
Sunken Hollow
33%inclusion136 decks410 decks
-6%synergy
Drowned Catacomb
32%inclusion132 decks410 decks
-3%synergy
Meticulous Archive
32%inclusion130 decks410 decks
18%synergy
Sea of Clouds
31%inclusion128 decks410 decks
-5%synergy
Vault of Champions
30%inclusion125 decks410 decks
-2%synergy
Undercity Sewers
30%inclusion124 decks410 decks
16%synergy
Shadowy Backstreet
30%inclusion122 decks410 decks
17%synergy
Temple of Silence
28%inclusion113 decks410 decks
8%synergy
Morphic Pool
27%inclusion112 decks410 decks
-7%synergy
Temple of Enlightenment
27%inclusion109 decks410 decks
10%synergy
Azorius Chancery
26%inclusion108 decks410 decks
12%synergy
Floodfarm Verge
26%inclusion106 decks410 decks
15%synergy
Terramorphic Expanse
26%inclusion105 decks410 decks
9%synergy
Deserted Beach
25%inclusion101 decks410 decks
4%synergy
Evolving Wilds
24%inclusion100 decks410 decks
-1%synergy
Obscura Storefront
24%inclusion99 decks410 decks
14%synergy
Temple of Deceit
24%inclusion98 decks410 decks
6%synergy
Tainted Field
24%inclusion98 decks410 decks
17%synergy
Orzhov Basilica
23%inclusion96 decks410 decks
7%synergy
Gloomlake Verge
23%inclusion94 decks410 decks
12%synergy
Contaminated Landscape
23%inclusion93 decks410 decks
8%synergy
Dimir Aqueduct
23%inclusion93 decks410 decks
9%synergy
Shipwreck Marsh
21%inclusion88 decks410 decks
1%synergy
Tainted Isle
21%inclusion87 decks410 decks
15%synergy
Shattered Sanctum
17%inclusion71 decks410 decks
1%synergy
Ash Barrens
16%inclusion66 decks410 decks
5%synergy
Path of Ancestry
16%inclusion64 decks410 decks
-12%synergy
Sink into Stupor
15%inclusion62 decks410 decks
3%synergy
Darkwater Catacombs
14%inclusion56 decks410 decks
-1%synergy
Skycloud Expanse
13%inclusion55 decks410 decks
-1%synergy
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