The Master of Keys (Commander) - Midrange

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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Utility Lands
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Wan Shi Tong, Librarian
19%inclusion3 decks16 decks
14%synergy
Airbender Ascension
6.3%inclusion1 decks16 decks
6%synergy
Azula, Cunning Usurper
6.3%inclusion1 decks16 decks
6%synergy
High Synergy Cards
Necromancy
84%inclusion77 decks92 decks
79%synergy
Animate Dead
83%inclusion76 decks92 decks
73%synergy
Dress Down
71%inclusion65 decks92 decks
68%synergy
Abdel Adrian, Gorion's Ward
62%inclusion57 decks92 decks
60%synergy
Dance of the Dead
61%inclusion56 decks92 decks
59%synergy
Mystic Remora
76%inclusion70 decks92 decks
55%synergy
Entomb
61%inclusion56 decks92 decks
54%synergy
Amphibian Downpour
54%inclusion50 decks92 decks
50%synergy
Ripples of Undeath
52%inclusion48 decks92 decks
49%synergy
Tainted Pact
53%inclusion49 decks92 decks
46%synergy
Top Cards
Dark Ritual
64%inclusion59 decks92 decks
45%synergy
Swords to Plowshares
61%inclusion56 decks92 decks
-7%synergy
Swan Song
58%inclusion53 decks92 decks
38%synergy
Esper Sentinel
58%inclusion53 decks92 decks
30%synergy
Grand Abolisher
58%inclusion53 decks92 decks
43%synergy
Lotho, Corrupt Shirriff
54%inclusion50 decks92 decks
37%synergy
Silence
54%inclusion50 decks92 decks
44%synergy
Sevinne's Reclamation
53%inclusion49 decks92 decks
44%synergy
Force of Negation
51%inclusion47 decks92 decks
39%synergy
Orcish Bowmasters
51%inclusion47 decks92 decks
40%synergy
Game Changers
Smothering Tithe
71%inclusion65 decks92 decks
39%synergy
Rhystic Study
67%inclusion62 decks92 decks
35%synergy
Enlightened Tutor
63%inclusion58 decks92 decks
43%synergy
Demonic Tutor
60%inclusion55 decks92 decks
38%synergy
Mana Vault
57%inclusion52 decks92 decks
47%synergy
Force of Will
57%inclusion52 decks92 decks
44%synergy
Vampiric Tutor
57%inclusion52 decks92 decks
39%synergy
Ancient Tomb
55%inclusion51 decks92 decks
42%synergy
Thassa's Oracle
55%inclusion51 decks92 decks
46%synergy
Chrome Mox
53%inclusion49 decks92 decks
44%synergy
Creatures
Valley Floodcaller
49%inclusion45 decks92 decks
45%synergy
Ranger-Captain of Eos
47%inclusion43 decks92 decks
40%synergy
Hullbreaker Horror
34%inclusion31 decks92 decks
28%synergy
Displacer Kitten
33%inclusion30 decks92 decks
25%synergy
Inquisitive Glimmer
32%inclusion29 decks92 decks
24%synergy
Archivist of Oghma
30%inclusion28 decks92 decks
24%synergy
Opposition Agent
30%inclusion28 decks92 decks
22%synergy
Mesa Enchantress
30%inclusion28 decks92 decks
21%synergy
Entity Tracker
30%inclusion28 decks92 decks
24%synergy
Starfield Mystic
27%inclusion25 decks92 decks
20%synergy
Mockingbird
27%inclusion25 decks92 decks
23%synergy
Demon of Fate's Design
27%inclusion25 decks92 decks
22%synergy
Voice of Victory
25%inclusion13 decks52 decks
17%synergy
Doomwake Giant
25%inclusion23 decks92 decks
19%synergy
Ledger Shredder
25%inclusion23 decks92 decks
16%synergy
Victor, Valgavoth's Seneschal
24%inclusion22 decks92 decks
22%synergy
Lurrus of the Dream-Den
23%inclusion21 decks92 decks
21%synergy
Fear of Sleep Paralysis
23%inclusion21 decks92 decks
17%synergy
Scrabbling Skullcrab
22%inclusion20 decks92 decks
21%synergy
Gravebreaker Lamia
22%inclusion20 decks92 decks
21%synergy
Overlord of the Floodpits
21%inclusion19 decks92 decks
17%synergy
Overlord of the Balemurk
21%inclusion19 decks92 decks
19%synergy
Zur, Eternal Schemer
20%inclusion18 decks92 decks
16%synergy
Zur the Enchanter
20%inclusion18 decks92 decks
14%synergy
Ondu Spiritdancer
18%inclusion17 decks92 decks
12%synergy
Phyrexian Metamorph
18%inclusion17 decks92 decks
10%synergy
Drannith Magistrate
18%inclusion17 decks92 decks
10%synergy
Auriok Salvagers
18%inclusion17 decks92 decks
18%synergy
Enduring Curiosity
16%inclusion15 decks92 decks
9%synergy
Ghostly Dancers
16%inclusion15 decks92 decks
14%synergy
Fear of Impostors
15%inclusion14 decks92 decks
14%synergy
Heliod, the Radiant Dawn
15%inclusion14 decks92 decks
11%synergy
Faerie Mastermind
15%inclusion14 decks92 decks
6%synergy
Grim Guardian
15%inclusion14 decks92 decks
13%synergy
Talion, the Kindly Lord
14%inclusion13 decks92 decks
6%synergy
Psychic Frog
14%inclusion13 decks92 decks
7%synergy
Ghostly Pilferer
14%inclusion13 decks92 decks
7%synergy
Silent Hallcreeper
13%inclusion12 decks92 decks
9%synergy
Soaring Lightbringer
13%inclusion12 decks92 decks
8%synergy
Hedron Crab
13%inclusion12 decks92 decks
12%synergy
Moon-Blessed Cleric
12%inclusion11 decks92 decks
7%synergy
Tataru Taru
12%inclusion5 decks42 decks
4%synergy
Aminatou, Veil Piercer
10%inclusion9 decks92 decks
8%synergy
Archon of Sun's Grace
10%inclusion9 decks92 decks
5%synergy
Pollywog Prodigy
10%inclusion9 decks92 decks
6%synergy
Alseid of Life's Bounty
10%inclusion9 decks92 decks
8%synergy
High Fae Trickster
8.9%inclusion7 decks79 decks
4%synergy
Leonin Relic-Warder
8.7%inclusion8 decks92 decks
8%synergy
Sage of Mysteries
7.6%inclusion7 decks92 decks
7%synergy
Spirited Companion
7.6%inclusion7 decks92 decks
6%synergy
Instants
Flusterstorm
50%inclusion46 decks92 decks
42%synergy
Mental Misstep
49%inclusion45 decks92 decks
42%synergy
Demonic Consultation
48%inclusion44 decks92 decks
39%synergy
Mindbreak Trap
48%inclusion44 decks92 decks
41%synergy
Intuition
47%inclusion43 decks92 decks
45%synergy
Fierce Guardianship
46%inclusion42 decks92 decks
25%synergy
Pact of Negation
46%inclusion42 decks92 decks
38%synergy
Borne Upon a Wind
43%inclusion40 decks92 decks
39%synergy
An Offer You Can't Refuse
42%inclusion39 decks92 decks
16%synergy
Cyclonic Rift
42%inclusion39 decks92 decks
18%synergy
Mystical Tutor
42%inclusion39 decks92 decks
31%synergy
Cabal Ritual
36%inclusion33 decks92 decks
32%synergy
Sink into Stupor
27%inclusion25 decks92 decks
15%synergy
Mana Drain
25%inclusion23 decks92 decks
8%synergy
Chain of Vapor
23%inclusion21 decks92 decks
19%synergy
Gifts Ungiven
22%inclusion20 decks92 decks
19%synergy
Into the Flood Maw
20%inclusion18 decks92 decks
16%synergy
Counterspell
17%inclusion16 decks92 decks
-24%synergy
Retraction Helix
15%inclusion14 decks92 decks
14%synergy
Path to Exile
15%inclusion14 decks92 decks
-27%synergy
Dovin's Veto
14%inclusion13 decks92 decks
-11%synergy
Arcane Denial
13%inclusion12 decks92 decks
-7%synergy
Frantic Search
12%inclusion11 decks92 decks
-5%synergy
Darkblast
11%inclusion10 decks92 decks
11%synergy
Culling the Weak
11%inclusion10 decks92 decks
9%synergy
Strix Serenade
11%inclusion10 decks92 decks
7%synergy
Brain Freeze
10%inclusion9 decks92 decks
9%synergy
Negate
10%inclusion9 decks92 decks
-7%synergy
Dispel
10%inclusion9 decks92 decks
6%synergy
Deadly Rollick
8.7%inclusion8 decks92 decks
-5%synergy
Ad Nauseam
8.7%inclusion8 decks92 decks
6%synergy
Banishing Knack
7.6%inclusion7 decks92 decks
7%synergy
Thirst for Meaning
7.6%inclusion7 decks92 decks
6%synergy
Void Rend
7.6%inclusion7 decks92 decks
-26%synergy
Anguished Unmaking
7.6%inclusion7 decks92 decks
-17%synergy
Teferi's Protection
6.5%inclusion6 decks92 decks
-10%synergy
Muddle the Mixture
5.4%inclusion5 decks92 decks
1%synergy
Fell the Profane
5.4%inclusion5 decks92 decks
-3%synergy
Lim-Dûl's Vault
5.4%inclusion5 decks92 decks
2%synergy
Faithful Mending
5.4%inclusion5 decks92 decks
2%synergy
Otherworldly Gaze
5.4%inclusion5 decks92 decks
3%synergy
Saw in Half
5.4%inclusion5 decks92 decks
3%synergy
Sorceries
Imperial Seal
43%inclusion40 decks92 decks
36%synergy
Reanimate
33%inclusion30 decks92 decks
17%synergy
Windfall
27%inclusion25 decks92 decks
13%synergy
Toxic Deluge
21%inclusion19 decks92 decks
1%synergy
Singularity Rupture
18%inclusion6 decks34 decks
15%synergy
Lively Dirge
17%inclusion16 decks92 decks
16%synergy
Demonic Counsel
16%inclusion15 decks92 decks
15%synergy
Mnemonic Betrayal
14%inclusion13 decks92 decks
11%synergy
Beseech the Mirror
13%inclusion12 decks92 decks
9%synergy
Redress Fate
13%inclusion12 decks92 decks
7%synergy
Dance of the Manse
10%inclusion9 decks92 decks
6%synergy
Unmarked Grave
10%inclusion9 decks92 decks
8%synergy
Buried Alive
10%inclusion9 decks92 decks
6%synergy
Space-Time Anomaly
8.8%inclusion3 decks34 decks
7%synergy
Idyllic Tutor
8.7%inclusion8 decks92 decks
4%synergy
Yawgmoth's Will
7.6%inclusion7 decks92 decks
6%synergy
Diabolic Intent
6.5%inclusion6 decks92 decks
1%synergy
Supreme Verdict
6.5%inclusion6 decks92 decks
-8%synergy
Praetor's Grasp
6.5%inclusion6 decks92 decks
4%synergy
Glimpse the Unthinkable
5.4%inclusion5 decks92 decks
5%synergy
Extinguish All Hope
5.4%inclusion5 decks92 decks
4%synergy
Replenish
5.4%inclusion5 decks92 decks
4%synergy
Damn
5.4%inclusion5 decks92 decks
-15%synergy
Utility Artifacts
The One Ring
47%inclusion43 decks92 decks
33%synergy
Wishclaw Talisman
45%inclusion41 decks92 decks
36%synergy
Mesmeric Orb
11%inclusion10 decks92 decks
10%synergy
Vexing Bauble
7.6%inclusion7 decks92 decks
6%synergy
Sensei's Divining Top
6.5%inclusion6 decks92 decks
-3%synergy
Lightning Greaves
6.5%inclusion6 decks92 decks
-16%synergy
Enchantments
Blind Obedience
50%inclusion46 decks92 decks
38%synergy
Mirrormade
47%inclusion43 decks92 decks
37%synergy
Tinybones Joins Up
45%inclusion41 decks92 decks
43%synergy
Touch the Spirit Realm
37%inclusion34 decks92 decks
34%synergy
The Meathook Massacre
36%inclusion33 decks92 decks
32%synergy
Necropotence
35%inclusion32 decks92 decks
28%synergy
Copy Artifact
29%inclusion27 decks92 decks
28%synergy
Static Prison
27%inclusion25 decks92 decks
27%synergy
Sphere of Safety
23%inclusion21 decks92 decks
13%synergy
Seal of Cleansing
23%inclusion21 decks92 decks
21%synergy
Secret Arcade // Dusty Parlor
23%inclusion21 decks92 decks
18%synergy
Propaganda
23%inclusion21 decks92 decks
-4%synergy
Monologue Tax
22%inclusion20 decks92 decks
16%synergy
Grasp of Fate
21%inclusion19 decks92 decks
14%synergy
Sigil of the Empty Throne
21%inclusion19 decks92 decks
15%synergy
Cemetery Tampering
17%inclusion16 decks92 decks
17%synergy
Ghostly Prison
17%inclusion16 decks92 decks
-4%synergy
Seal of Removal
17%inclusion16 decks92 decks
17%synergy
Copy Enchantment
16%inclusion15 decks92 decks
12%synergy
Steal Enchantment
15%inclusion14 decks92 decks
14%synergy
Starfield of Nyx
15%inclusion14 decks92 decks
11%synergy
Stillness in Motion
14%inclusion7 decks50 decks
14%synergy
Founding the Third Path
13%inclusion12 decks92 decks
13%synergy
Estrid's Invocation
13%inclusion12 decks92 decks
8%synergy
Greater Auramancy
13%inclusion12 decks92 decks
9%synergy
Black Market Connections
12%inclusion11 decks92 decks
-2%synergy
Teval's Judgment
12%inclusion6 decks52 decks
11%synergy
Sheltered by Ghosts
11%inclusion10 decks92 decks
8%synergy
Chains of Mephistopheles
11%inclusion10 decks92 decks
11%synergy
Counterbalance
10%inclusion9 decks92 decks
8%synergy
Authority of the Consuls
10%inclusion9 decks92 decks
-1%synergy
Darksteel Mutation
10%inclusion9 decks92 decks
3%synergy
Nowhere to Run
10%inclusion9 decks92 decks
9%synergy
Mirror Room // Fractured Realm
10%inclusion9 decks92 decks
7%synergy
Phyrexian Arena
10%inclusion9 decks92 decks
-4%synergy
Trouble in Pairs
10%inclusion9 decks92 decks
4%synergy
Cacophony Unleashed
8.7%inclusion8 decks92 decks
7%synergy
Shark Typhoon
8.7%inclusion8 decks92 decks
3%synergy
The Tale of Tamiyo
8.7%inclusion8 decks92 decks
8%synergy
Restricted Office // Lecture Hall
8.7%inclusion8 decks92 decks
6%synergy
Ethereal Armor
8.7%inclusion8 decks92 decks
4%synergy
All That Glitters
7.6%inclusion7 decks92 decks
-1%synergy
Imprisoned in the Moon
7.6%inclusion7 decks92 decks
1%synergy
Leyline of Anticipation
7.6%inclusion7 decks92 decks
3%synergy
Bottomless Pool // Locker Room
7.6%inclusion7 decks92 decks
6%synergy
Defiled Crypt // Cadaver Lab
7.6%inclusion7 decks92 decks
7%synergy
Cramped Vents // Access Maze
6.5%inclusion6 decks92 decks
4%synergy
Oubliette
6.5%inclusion6 decks92 decks
5%synergy
Aura of Silence
6.5%inclusion6 decks92 decks
3%synergy
Dazzling Theater // Prop Room
6.5%inclusion6 decks92 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
24%inclusion22 decks92 decks
16%synergy
Utility Lands
Otawara, Soaring City
51%inclusion47 decks92 decks
32%synergy
Hall of Heliod's Generosity
28%inclusion26 decks92 decks
15%synergy
Urza's Saga
26%inclusion24 decks92 decks
14%synergy
Cephalid Coliseum
22%inclusion20 decks92 decks
18%synergy
Emergence Zone
21%inclusion19 decks92 decks
19%synergy
Bojuka Bog
18%inclusion17 decks92 decks
-9%synergy
Minamo, School at Water's Edge
14%inclusion13 decks92 decks
10%synergy
Serra's Sanctum
13%inclusion12 decks92 decks
11%synergy
Ishgard, the Holy See
10%inclusion4 decks42 decks
6%synergy
Adagia, Windswept Bastion
8.8%inclusion3 decks34 decks
6%synergy
City of Traitors
7.6%inclusion7 decks92 decks
6%synergy
Urborg, Tomb of Yawgmoth
6.5%inclusion6 decks92 decks
-7%synergy
Takenuma, Abandoned Mire
5.4%inclusion5 decks92 decks
-1%synergy
Mana Artifacts
Sol Ring
96%inclusion88 decks92 decks
6%synergy
Arcane Signet
92%inclusion85 decks92 decks
5%synergy
Talisman of Dominance
77%inclusion71 decks92 decks
28%synergy
Fellwar Stone
60%inclusion55 decks92 decks
26%synergy
Talisman of Progress
57%inclusion52 decks92 decks
14%synergy
Lotus Petal
54%inclusion50 decks92 decks
44%synergy
Mox Diamond
51%inclusion47 decks92 decks
44%synergy
Talisman of Hierarchy
49%inclusion45 decks92 decks
6%synergy
Mox Opal
48%inclusion44 decks92 decks
39%synergy
Lion's Eye Diamond
36%inclusion33 decks92 decks
34%synergy
Mox Amber
23%inclusion21 decks92 decks
17%synergy
Grim Monolith
22%inclusion20 decks92 decks
18%synergy
Azorius Signet
18%inclusion17 decks92 decks
-14%synergy
Orzhov Signet
17%inclusion16 decks92 decks
-17%synergy
Dimir Signet
13%inclusion12 decks92 decks
-19%synergy
Mind Stone
8.7%inclusion8 decks92 decks
-4%synergy
Lands
Command Tower
96%inclusion88 decks92 decks
3%synergy
Watery Grave
77%inclusion71 decks92 decks
27%synergy
Polluted Delta
76%inclusion70 decks92 decks
39%synergy
Flooded Strand
74%inclusion68 decks92 decks
36%synergy
Hallowed Fountain
73%inclusion67 decks92 decks
24%synergy
Exotic Orchard
72%inclusion66 decks92 decks
13%synergy
Godless Shrine
71%inclusion65 decks92 decks
20%synergy
Marsh Flats
71%inclusion65 decks92 decks
35%synergy
Island
68%inclusion63 decks92 decks
-24%synergy
Swamp
60%inclusion55 decks92 decks
-31%synergy
City of Brass
57%inclusion52 decks92 decks
41%synergy
Mana Confluence
57%inclusion52 decks92 decks
43%synergy
Plains
53%inclusion49 decks92 decks
-38%synergy
Bloodstained Mire
53%inclusion49 decks92 decks
42%synergy
Tundra
52%inclusion48 decks92 decks
36%synergy
Misty Rainforest
52%inclusion48 decks92 decks
41%synergy
Gemstone Caverns
52%inclusion48 decks92 decks
44%synergy
Scrubland
52%inclusion48 decks92 decks
36%synergy
Underground Sea
51%inclusion47 decks92 decks
35%synergy
Morphic Pool
50%inclusion46 decks92 decks
16%synergy
Verdant Catacombs
49%inclusion45 decks92 decks
39%synergy
Undercity Sewers
47%inclusion43 decks92 decks
33%synergy
Scalding Tarn
47%inclusion43 decks92 decks
36%synergy
Windswept Heath
40%inclusion37 decks92 decks
30%synergy
Arid Mesa
36%inclusion33 decks92 decks
26%synergy
Vault of Champions
35%inclusion32 decks92 decks
2%synergy
Sea of Clouds
33%inclusion30 decks92 decks
-3%synergy
Underground River
30%inclusion28 decks92 decks
-2%synergy
Caves of Koilos
29%inclusion27 decks92 decks
-6%synergy
Adarkar Wastes
29%inclusion27 decks92 decks
-1%synergy
Sink into Stupor
27%inclusion25 decks92 decks
15%synergy
Arcane Sanctum
25%inclusion23 decks92 decks
-30%synergy
Glacial Fortress
25%inclusion23 decks92 decks
-15%synergy
Meticulous Archive
22%inclusion20 decks92 decks
8%synergy
Isolated Chapel
20%inclusion18 decks92 decks
-19%synergy
Sunken Hollow
18%inclusion17 decks92 decks
-21%synergy
Raffine's Tower
18%inclusion17 decks92 decks
-23%synergy
Shadowy Backstreet
17%inclusion16 decks92 decks
5%synergy
Drowned Catacomb
17%inclusion16 decks92 decks
-18%synergy
Contaminated Landscape
16%inclusion15 decks92 decks
2%synergy
Prairie Stream
15%inclusion14 decks92 decks
-25%synergy
Deserted Beach
15%inclusion14 decks92 decks
-6%synergy
Shipwreck Marsh
14%inclusion13 decks92 decks
-7%synergy
Cavern of Souls
13%inclusion12 decks92 decks
6%synergy
Floodfarm Verge
13%inclusion12 decks92 decks
2%synergy
Temple of Deceit
13%inclusion12 decks92 decks
-5%synergy
Spire of Industry
13%inclusion12 decks92 decks
4%synergy
Temple of Silence
13%inclusion12 decks92 decks
-7%synergy
Valgavoth's Lair
12%inclusion11 decks92 decks
9%synergy
Gloomlake Verge
12%inclusion11 decks92 decks
1%synergy
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