The Master of Keys (Commander) - Expensive 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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Utility Lands
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Eiganjo Dynastorian
33%inclusion1 decks3 decks
33%synergy
Turbulent Moor
33%inclusion1 decks3 decks
33%synergy
Changing Loyalty
33%inclusion1 decks3 decks
33%synergy
Does Machines
5.3%inclusion1 decks19 decks
5%synergy
High Synergy Cards
Animate Dead
84%inclusion42 decks50 decks
74%synergy
Ripples of Undeath
76%inclusion38 decks50 decks
73%synergy
Necromancy
74%inclusion37 decks50 decks
69%synergy
Dance of the Dead
62%inclusion31 decks50 decks
60%synergy
Inquisitive Glimmer
66%inclusion33 decks50 decks
59%synergy
Dress Down
58%inclusion29 decks50 decks
56%synergy
Amphibian Downpour
58%inclusion29 decks50 decks
53%synergy
Entity Tracker
58%inclusion29 decks50 decks
52%synergy
Sevinne's Reclamation
60%inclusion30 decks50 decks
51%synergy
Entomb
54%inclusion27 decks50 decks
47%synergy
Top Cards
Mystic Remora
62%inclusion31 decks50 decks
41%synergy
Swords to Plowshares
56%inclusion28 decks50 decks
-12%synergy
Propaganda
54%inclusion27 decks50 decks
26%synergy
Sphere of Safety
50%inclusion25 decks50 decks
41%synergy
Mirrormade
48%inclusion24 decks50 decks
38%synergy
Gravebreaker Lamia
46%inclusion23 decks50 decks
45%synergy
Demon of Fate's Design
44%inclusion22 decks50 decks
39%synergy
Blind Obedience
44%inclusion22 decks50 decks
32%synergy
Fear of Impostors
44%inclusion22 decks50 decks
43%synergy
Scrabbling Skullcrab
42%inclusion21 decks50 decks
41%synergy
Game Changers
Smothering Tithe
52%inclusion26 decks50 decks
21%synergy
Rhystic Study
50%inclusion25 decks50 decks
19%synergy
Enlightened Tutor
18%inclusion9 decks50 decks
-1%synergy
Gifts Ungiven
18%inclusion9 decks50 decks
15%synergy
Serra's Sanctum
16%inclusion8 decks50 decks
14%synergy
The One Ring
14%inclusion7 decks50 decks
1%synergy
Farewell
14%inclusion7 decks50 decks
1%synergy
Demonic Tutor
14%inclusion7 decks50 decks
-7%synergy
Necropotence
12%inclusion6 decks50 decks
5%synergy
Intuition
12%inclusion6 decks50 decks
10%synergy
Creatures
Starfield Mystic
42%inclusion21 decks50 decks
35%synergy
Mesa Enchantress
42%inclusion21 decks50 decks
33%synergy
Zur the Enchanter
40%inclusion20 decks50 decks
35%synergy
Overlord of the Balemurk
38%inclusion19 decks50 decks
36%synergy
Overlord of the Floodpits
32%inclusion16 decks50 decks
28%synergy
Esper Sentinel
32%inclusion16 decks50 decks
5%synergy
Fear of Sleep Paralysis
32%inclusion16 decks50 decks
27%synergy
Ondu Spiritdancer
32%inclusion16 decks50 decks
26%synergy
Hedron Crab
28%inclusion14 decks50 decks
27%synergy
Abdel Adrian, Gorion's Ward
28%inclusion14 decks50 decks
26%synergy
Zur, Eternal Schemer
28%inclusion14 decks50 decks
25%synergy
Victor, Valgavoth's Seneschal
26%inclusion13 decks50 decks
24%synergy
Hullbreaker Horror
24%inclusion12 decks50 decks
18%synergy
Lotho, Corrupt Shirriff
24%inclusion12 decks50 decks
7%synergy
Doomwake Giant
22%inclusion11 decks50 decks
16%synergy
Enduring Curiosity
22%inclusion11 decks50 decks
14%synergy
Witch Enchanter
20%inclusion10 decks50 decks
13%synergy
Psychic Frog
20%inclusion10 decks50 decks
13%synergy
Ledger Shredder
20%inclusion10 decks50 decks
11%synergy
Lurrus of the Dream-Den
20%inclusion10 decks50 decks
18%synergy
Ghostly Dancers
20%inclusion10 decks50 decks
18%synergy
Displacer Kitten
18%inclusion9 decks50 decks
11%synergy
Grand Abolisher
18%inclusion9 decks50 decks
4%synergy
Sage of Mysteries
18%inclusion9 decks50 decks
18%synergy
Overlord of the Mistmoors
16%inclusion8 decks50 decks
14%synergy
Silent Hallcreeper
16%inclusion8 decks50 decks
11%synergy
Grim Guardian
16%inclusion8 decks50 decks
14%synergy
Valgavoth, Terror Eater
14%inclusion7 decks50 decks
11%synergy
Boggart Trawler
12%inclusion6 decks50 decks
9%synergy
Leonin Relic-Warder
12%inclusion6 decks50 decks
12%synergy
Valley Floodcaller
12%inclusion6 decks50 decks
8%synergy
Sun Titan
12%inclusion6 decks50 decks
4%synergy
Aminatou, Veil Piercer
12%inclusion6 decks50 decks
11%synergy
Heliod, the Radiant Dawn
12%inclusion6 decks50 decks
8%synergy
Voice of Victory
11%inclusion5 decks46 decks
3%synergy
Archon of Sun's Grace
10%inclusion5 decks50 decks
5%synergy
Hydroelectric Specimen
10%inclusion5 decks50 decks
7%synergy
Moon-Blessed Cleric
10%inclusion5 decks50 decks
5%synergy
Ghostly Pilferer
10%inclusion5 decks50 decks
3%synergy
Talion, the Kindly Lord
8.0%inclusion4 decks50 decks
0%synergy
Toxrill, the Corrosive
8.0%inclusion4 decks50 decks
5%synergy
Angel of Suffering
8.0%inclusion4 decks50 decks
8%synergy
Laboratory Maniac
8.0%inclusion4 decks50 decks
5%synergy
Neerdiv, Devious Diver
8.0%inclusion4 decks50 decks
8%synergy
Thassa's Oracle
8.0%inclusion4 decks50 decks
-1%synergy
Summon: Yojimbo
7.1%inclusion3 decks42 decks
6%synergy
Summon: Bahamut
7.1%inclusion3 decks42 decks
6%synergy
Wan Shi Tong, Librarian
6.7%inclusion2 decks30 decks
2%synergy
Phyrexian Metamorph
6.0%inclusion3 decks50 decks
-2%synergy
Soaring Lightbringer
6.0%inclusion3 decks50 decks
1%synergy
Instants
Dark Ritual
40%inclusion20 decks50 decks
20%synergy
Mana Drain
40%inclusion20 decks50 decks
23%synergy
Swan Song
38%inclusion19 decks50 decks
18%synergy
An Offer You Can't Refuse
36%inclusion18 decks50 decks
9%synergy
Sink into Stupor
36%inclusion18 decks50 decks
23%synergy
Counterspell
34%inclusion17 decks50 decks
-8%synergy
Arcane Denial
28%inclusion14 decks50 decks
8%synergy
Path to Exile
24%inclusion12 decks50 decks
-18%synergy
Cabal Ritual
20%inclusion10 decks50 decks
17%synergy
Dovin's Veto
18%inclusion9 decks50 decks
-8%synergy
Fell the Profane
18%inclusion9 decks50 decks
9%synergy
Void Rend
16%inclusion8 decks50 decks
-19%synergy
Frantic Search
14%inclusion7 decks50 decks
-4%synergy
Teferi's Protection
10%inclusion5 decks50 decks
-6%synergy
Strix Serenade
10%inclusion5 decks50 decks
6%synergy
Cyclonic Rift
10%inclusion5 decks50 decks
-13%synergy
Darkblast
10%inclusion5 decks50 decks
10%synergy
Thirst for Meaning
10%inclusion5 decks50 decks
9%synergy
Silence
10%inclusion5 decks50 decks
0%synergy
Borne Upon a Wind
8.0%inclusion4 decks50 decks
3%synergy
Negate
8.0%inclusion4 decks50 decks
-8%synergy
Brain Freeze
8.0%inclusion4 decks50 decks
7%synergy
Into the Flood Maw
8.0%inclusion4 decks50 decks
4%synergy
Anguished Unmaking
8.0%inclusion4 decks50 decks
-17%synergy
Fierce Guardianship
8.0%inclusion4 decks50 decks
-12%synergy
Generous Gift
8.0%inclusion4 decks50 decks
-6%synergy
Flusterstorm
8.0%inclusion4 decks50 decks
0%synergy
Force of Negation
8.0%inclusion4 decks50 decks
-4%synergy
Otherworldly Gaze
8.0%inclusion4 decks50 decks
6%synergy
Muddle the Mixture
6.0%inclusion3 decks50 decks
2%synergy
Culling the Weak
6.0%inclusion3 decks50 decks
4%synergy
Perplex
6.0%inclusion3 decks50 decks
5%synergy
Tainted Pact
6.0%inclusion3 decks50 decks
-1%synergy
Chain of Vapor
6.0%inclusion3 decks50 decks
3%synergy
Waterlogged Teachings
6.0%inclusion3 decks50 decks
1%synergy
Vampiric Tutor
6.0%inclusion3 decks50 decks
-11%synergy
Mental Misstep
6.0%inclusion3 decks50 decks
-1%synergy
Brainstorm
6.0%inclusion3 decks50 decks
-11%synergy
Delay
6.0%inclusion3 decks50 decks
4%synergy
Demonic Consultation
6.0%inclusion3 decks50 decks
-2%synergy
Faithful Mending
6.0%inclusion3 decks50 decks
2%synergy
Inkshield
6.0%inclusion3 decks50 decks
-4%synergy
Consult the Star Charts
5.4%inclusion2 decks37 decks
5%synergy
Sorceries
Reanimate
34%inclusion17 decks50 decks
18%synergy
Redress Fate
24%inclusion12 decks50 decks
18%synergy
Replenish
22%inclusion11 decks50 decks
20%synergy
Windfall
22%inclusion11 decks50 decks
9%synergy
Toxic Deluge
22%inclusion11 decks50 decks
2%synergy
Singularity Rupture
22%inclusion8 decks37 decks
19%synergy
Glimpse the Unthinkable
20%inclusion10 decks50 decks
20%synergy
Extinguish All Hope
14%inclusion7 decks50 decks
12%synergy
Damn
14%inclusion7 decks50 decks
-6%synergy
Supreme Verdict
14%inclusion7 decks50 decks
-1%synergy
Space-Time Anomaly
14%inclusion5 decks36 decks
12%synergy
Lively Dirge
10%inclusion5 decks50 decks
9%synergy
Idyllic Tutor
10%inclusion5 decks50 decks
6%synergy
Beseech the Mirror
10%inclusion5 decks50 decks
6%synergy
Ponder
8.0%inclusion4 decks50 decks
-1%synergy
Austere Command
8.0%inclusion4 decks50 decks
-1%synergy
Sea Gate Restoration
8.0%inclusion4 decks50 decks
5%synergy
Buried Alive
8.0%inclusion4 decks50 decks
4%synergy
Resurgent Belief
8.0%inclusion4 decks50 decks
6%synergy
Dance of the Manse
8.0%inclusion4 decks50 decks
5%synergy
Diabolic Intent
8.0%inclusion4 decks50 decks
3%synergy
Demonic Counsel
8.0%inclusion4 decks50 decks
7%synergy
Wrath of God
6.0%inclusion3 decks50 decks
2%synergy
Time Wipe
6.0%inclusion3 decks50 decks
-1%synergy
Agadeem's Awakening
6.0%inclusion3 decks50 decks
4%synergy
Night's Whisper
6.0%inclusion3 decks50 decks
3%synergy
Blasphemous Edict
6.0%inclusion3 decks50 decks
3%synergy
Utility Artifacts
Mesmeric Orb
32%inclusion16 decks50 decks
31%synergy
Lightning Greaves
14%inclusion7 decks50 decks
-9%synergy
Cloud Key
10%inclusion5 decks50 decks
7%synergy
Crucible of Worlds
10%inclusion5 decks50 decks
9%synergy
Wishclaw Talisman
10%inclusion5 decks50 decks
2%synergy
Perpetual Timepiece
8.0%inclusion4 decks50 decks
8%synergy
Wayfarer's Bauble
6.0%inclusion3 decks50 decks
-2%synergy
Swiftfoot Boots
6.0%inclusion3 decks50 decks
-18%synergy
Enchantments
Ghostly Prison
42%inclusion21 decks50 decks
20%synergy
Seal of Cleansing
40%inclusion20 decks50 decks
39%synergy
The Meathook Massacre
40%inclusion20 decks50 decks
37%synergy
Secret Arcade // Dusty Parlor
38%inclusion19 decks50 decks
33%synergy
Grasp of Fate
36%inclusion18 decks50 decks
30%synergy
Estrid's Invocation
34%inclusion17 decks50 decks
29%synergy
Imprisoned in the Moon
30%inclusion15 decks50 decks
23%synergy
Sigil of the Empty Throne
28%inclusion14 decks50 decks
22%synergy
Out of the Tombs
28%inclusion14 decks50 decks
28%synergy
Stillness in Motion
26%inclusion12 decks46 decks
26%synergy
Darksteel Mutation
26%inclusion13 decks50 decks
20%synergy
Greater Auramancy
26%inclusion13 decks50 decks
22%synergy
Polluted Cistern // Dim Oubliette
26%inclusion13 decks50 decks
25%synergy
Cemetery Tampering
26%inclusion13 decks50 decks
25%synergy
Black Market Connections
26%inclusion13 decks50 decks
11%synergy
Seal of Removal
24%inclusion12 decks50 decks
23%synergy
Tinybones Joins Up
22%inclusion11 decks50 decks
21%synergy
Touch the Spirit Realm
22%inclusion11 decks50 decks
20%synergy
Copy Enchantment
22%inclusion11 decks50 decks
17%synergy
Trouble in Pairs
22%inclusion11 decks50 decks
17%synergy
Static Prison
20%inclusion10 decks50 decks
20%synergy
Starfield of Nyx
18%inclusion9 decks50 decks
14%synergy
Sheltered by Ghosts
18%inclusion9 decks50 decks
15%synergy
The Tale of Tamiyo
18%inclusion9 decks50 decks
18%synergy
Leyline of Anticipation
18%inclusion9 decks50 decks
14%synergy
Out of Time
16%inclusion8 decks50 decks
15%synergy
Aura of Silence
16%inclusion8 decks50 decks
13%synergy
Defiled Crypt // Cadaver Lab
16%inclusion8 decks50 decks
15%synergy
All That Glitters
14%inclusion7 decks50 decks
5%synergy
Bottomless Pool // Locker Room
14%inclusion7 decks50 decks
12%synergy
Dazzling Theater // Prop Room
14%inclusion7 decks50 decks
13%synergy
Solitary Confinement
14%inclusion7 decks50 decks
12%synergy
Mirror Room // Fractured Realm
14%inclusion7 decks50 decks
12%synergy
Cacophony Unleashed
14%inclusion7 decks50 decks
12%synergy
Authority of the Consuls
14%inclusion7 decks50 decks
1%synergy
Funeral Room // Awakening Hall
14%inclusion7 decks50 decks
13%synergy
Court of Cunning
14%inclusion7 decks50 decks
13%synergy
Extravagant Replication
14%inclusion7 decks50 decks
9%synergy
Land Tax
14%inclusion7 decks50 decks
8%synergy
Shark Typhoon
12%inclusion6 decks50 decks
6%synergy
Seal of Doom
12%inclusion6 decks50 decks
12%synergy
Copy Artifact
12%inclusion6 decks50 decks
11%synergy
Monologue Tax
12%inclusion6 decks50 decks
6%synergy
Timely Ward
12%inclusion6 decks50 decks
7%synergy
Restricted Office // Lecture Hall
12%inclusion6 decks50 decks
10%synergy
Hallowed Haunting
12%inclusion6 decks50 decks
10%synergy
Teval's Judgment
11%inclusion5 decks46 decks
10%synergy
Founding the Third Path
10%inclusion5 decks50 decks
10%synergy
Chronic Flooding
10%inclusion5 decks50 decks
10%synergy
Phyrexian Arena
10%inclusion5 decks50 decks
-4%synergy
Planeswalkers
Teferi, Time Raveler
12%inclusion6 decks50 decks
4%synergy
Ashiok, Dream Render
6.0%inclusion3 decks50 decks
4%synergy
Utility Lands
Otawara, Soaring City
50%inclusion25 decks50 decks
31%synergy
Hall of Heliod's Generosity
46%inclusion23 decks50 decks
33%synergy
Takenuma, Abandoned Mire
28%inclusion14 decks50 decks
22%synergy
Cephalid Coliseum
28%inclusion14 decks50 decks
24%synergy
Bojuka Bog
26%inclusion13 decks50 decks
-1%synergy
Urza's Saga
24%inclusion12 decks50 decks
12%synergy
Urborg, Tomb of Yawgmoth
22%inclusion11 decks50 decks
9%synergy
Reliquary Tower
16%inclusion8 decks50 decks
-18%synergy
Mystic Sanctuary
12%inclusion6 decks50 decks
8%synergy
Ancient Tomb
10%inclusion5 decks50 decks
-3%synergy
Eiganjo, Seat of the Empire
10%inclusion5 decks50 decks
5%synergy
Seat of the Synod
6.0%inclusion3 decks50 decks
-3%synergy
Spymaster's Vault
6.0%inclusion3 decks50 decks
4%synergy
Ancient Den
6.0%inclusion3 decks50 decks
-3%synergy
Vault of Whispers
6.0%inclusion3 decks50 decks
-2%synergy
Minamo, School at Water's Edge
6.0%inclusion3 decks50 decks
2%synergy
Geier Reach Sanitarium
6.0%inclusion3 decks50 decks
2%synergy
Mana Artifacts
Sol Ring
94%inclusion47 decks50 decks
4%synergy
Arcane Signet
84%inclusion42 decks50 decks
-4%synergy
Talisman of Progress
56%inclusion28 decks50 decks
12%synergy
Talisman of Dominance
54%inclusion27 decks50 decks
4%synergy
Talisman of Hierarchy
50%inclusion25 decks50 decks
6%synergy
Fellwar Stone
42%inclusion21 decks50 decks
9%synergy
Azorius Signet
22%inclusion11 decks50 decks
-9%synergy
Lotus Petal
20%inclusion10 decks50 decks
10%synergy
Dimir Signet
18%inclusion9 decks50 decks
-13%synergy
Orzhov Signet
18%inclusion9 decks50 decks
-15%synergy
Mox Opal
10%inclusion5 decks50 decks
2%synergy
Mox Amber
10%inclusion5 decks50 decks
4%synergy
Mana Vault
6.0%inclusion3 decks50 decks
-3%synergy
Lands
Command Tower
100%inclusion50 decks50 decks
7%synergy
Underground Sea
98%inclusion49 decks50 decks
82%synergy
Tundra
96%inclusion48 decks50 decks
80%synergy
Scrubland
96%inclusion48 decks50 decks
80%synergy
Hallowed Fountain
94%inclusion47 decks50 decks
44%synergy
Watery Grave
94%inclusion47 decks50 decks
43%synergy
Godless Shrine
92%inclusion46 decks50 decks
41%synergy
Polluted Delta
90%inclusion45 decks50 decks
52%synergy
Flooded Strand
88%inclusion44 decks50 decks
50%synergy
Marsh Flats
88%inclusion44 decks50 decks
52%synergy
Island
84%inclusion42 decks50 decks
-9%synergy
Swamp
84%inclusion42 decks50 decks
-8%synergy
Plains
82%inclusion41 decks50 decks
-10%synergy
Raffine's Tower
72%inclusion36 decks50 decks
31%synergy
Undercity Sewers
68%inclusion34 decks50 decks
53%synergy
Sea of Clouds
68%inclusion34 decks50 decks
33%synergy
Vault of Champions
66%inclusion33 decks50 decks
34%synergy
Morphic Pool
64%inclusion32 decks50 decks
30%synergy
Meticulous Archive
62%inclusion31 decks50 decks
48%synergy
Exotic Orchard
56%inclusion28 decks50 decks
-3%synergy
Shadowy Backstreet
56%inclusion28 decks50 decks
43%synergy
Misty Rainforest
46%inclusion23 decks50 decks
35%synergy
Mana Confluence
40%inclusion20 decks50 decks
26%synergy
Arid Mesa
40%inclusion20 decks50 decks
30%synergy
City of Brass
40%inclusion20 decks50 decks
25%synergy
Scalding Tarn
38%inclusion19 decks50 decks
27%synergy
Bloodstained Mire
36%inclusion18 decks50 decks
25%synergy
Windswept Heath
36%inclusion18 decks50 decks
26%synergy
Sink into Stupor
36%inclusion18 decks50 decks
23%synergy
Floodfarm Verge
36%inclusion18 decks50 decks
25%synergy
Caves of Koilos
32%inclusion16 decks50 decks
-4%synergy
Verdant Catacombs
32%inclusion16 decks50 decks
22%synergy
Underground River
30%inclusion15 decks50 decks
-4%synergy
Arcane Sanctum
30%inclusion15 decks50 decks
-24%synergy
Adarkar Wastes
28%inclusion14 decks50 decks
-4%synergy
Gloomlake Verge
28%inclusion14 decks50 decks
17%synergy
Prismatic Vista
28%inclusion14 decks50 decks
24%synergy
Glacial Fortress
22%inclusion11 decks50 decks
-20%synergy
Isolated Chapel
22%inclusion11 decks50 decks
-19%synergy
Drowned Catacomb
22%inclusion11 decks50 decks
-15%synergy
Witch Enchanter
20%inclusion10 decks50 decks
13%synergy
Bleachbone Verge
18%inclusion9 decks50 decks
9%synergy
Fell the Profane
18%inclusion9 decks50 decks
9%synergy
Valgavoth's Lair
16%inclusion8 decks50 decks
13%synergy
Azorius Chancery
16%inclusion8 decks50 decks
2%synergy
Deserted Beach
16%inclusion8 decks50 decks
-5%synergy
Shipwreck Marsh
14%inclusion7 decks50 decks
-7%synergy
Shattered Sanctum
14%inclusion7 decks50 decks
-2%synergy
Gemstone Caverns
12%inclusion6 decks50 decks
4%synergy
Dimir Aqueduct
12%inclusion6 decks50 decks
-1%synergy
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