The Master of Keys (Commander) - Expensive Combo

The Master of Keys
Rank #316
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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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Wan Shi Tong, Librarian
100%inclusion1 decks1 decks
96%synergy
High Synergy Cards
Entomb
100%inclusion20 decks20 decks
93%synergy
Dress Down
95%inclusion19 decks20 decks
92%synergy
Necromancy
95%inclusion19 decks20 decks
90%synergy
Abdel Adrian, Gorion's Ward
90%inclusion18 decks20 decks
88%synergy
Mindbreak Trap
95%inclusion19 decks20 decks
88%synergy
Mental Misstep
95%inclusion19 decks20 decks
88%synergy
Flusterstorm
95%inclusion19 decks20 decks
87%synergy
Animate Dead
95%inclusion19 decks20 decks
85%synergy
Silence
95%inclusion19 decks20 decks
85%synergy
Dance of the Dead
85%inclusion17 decks20 decks
83%synergy
Top Cards
Dark Ritual
95%inclusion19 decks20 decks
76%synergy
Esper Sentinel
95%inclusion19 decks20 decks
67%synergy
Mystic Remora
95%inclusion19 decks20 decks
73%synergy
Smothering Tithe
90%inclusion18 decks20 decks
57%synergy
Tainted Pact
90%inclusion18 decks20 decks
82%synergy
Rhystic Study
90%inclusion18 decks20 decks
57%synergy
Demonic Consultation
90%inclusion18 decks20 decks
81%synergy
Force of Negation
90%inclusion18 decks20 decks
78%synergy
Orcish Bowmasters
90%inclusion18 decks20 decks
79%synergy
Lotho, Corrupt Shirriff
85%inclusion17 decks20 decks
68%synergy
Game Changers
Ancient Tomb
100%inclusion20 decks20 decks
87%synergy
Intuition
100%inclusion20 decks20 decks
98%synergy
Demonic Tutor
100%inclusion20 decks20 decks
78%synergy
Force of Will
100%inclusion20 decks20 decks
87%synergy
Thassa's Oracle
95%inclusion19 decks20 decks
85%synergy
Mana Vault
95%inclusion19 decks20 decks
85%synergy
Enlightened Tutor
95%inclusion19 decks20 decks
75%synergy
Chrome Mox
95%inclusion19 decks20 decks
85%synergy
Vampiric Tutor
95%inclusion19 decks20 decks
77%synergy
Mox Diamond
95%inclusion19 decks20 decks
88%synergy
Creatures
Grand Abolisher
85%inclusion17 decks20 decks
71%synergy
Ranger-Captain of Eos
85%inclusion17 decks20 decks
78%synergy
Valley Floodcaller
80%inclusion16 decks20 decks
76%synergy
Archivist of Oghma
65%inclusion13 decks20 decks
58%synergy
Voice of Victory
56%inclusion5 decks9 decks
47%synergy
Opposition Agent
55%inclusion11 decks20 decks
46%synergy
Hullbreaker Horror
55%inclusion11 decks20 decks
49%synergy
Mockingbird
50%inclusion10 decks20 decks
46%synergy
Displacer Kitten
45%inclusion9 decks20 decks
38%synergy
Phyrexian Metamorph
45%inclusion9 decks20 decks
36%synergy
Lurrus of the Dream-Den
45%inclusion9 decks20 decks
43%synergy
Auriok Salvagers
45%inclusion9 decks20 decks
45%synergy
Tataru Taru
38%inclusion3 decks8 decks
29%synergy
Hedron Crab
35%inclusion7 decks20 decks
34%synergy
Drannith Magistrate
30%inclusion6 decks20 decks
22%synergy
Ledger Shredder
30%inclusion6 decks20 decks
21%synergy
Ghostly Pilferer
30%inclusion6 decks20 decks
23%synergy
Faerie Mastermind
25%inclusion5 decks20 decks
16%synergy
Snapcaster Mage
15%inclusion3 decks20 decks
13%synergy
Leonin Relic-Warder
15%inclusion3 decks20 decks
15%synergy
Pollywog Prodigy
15%inclusion3 decks20 decks
11%synergy
Psychic Frog
15%inclusion3 decks20 decks
8%synergy
Emet-Selch of the Third Seat
13%inclusion1 decks8 decks
3%synergy
Volatile Stormdrake
10%inclusion2 decks20 decks
9%synergy
Overlord of the Balemurk
10%inclusion2 decks20 decks
8%synergy
Gilded Drake
10%inclusion2 decks20 decks
8%synergy
Talion, the Kindly Lord
10%inclusion2 decks20 decks
2%synergy
Academy Rector
10%inclusion2 decks20 decks
9%synergy
High Fae Trickster
6.7%inclusion1 decks15 decks
2%synergy
Neerdiv, Devious Diver
6.7%inclusion1 decks15 decks
7%synergy
Flesh Duplicate
5.0%inclusion1 decks20 decks
4%synergy
Hoarding Broodlord
5.0%inclusion1 decks20 decks
3%synergy
Starfield Mystic
5.0%inclusion1 decks20 decks
-2%synergy
Consecrated Sphinx
5.0%inclusion1 decks20 decks
-1%synergy
Felidar Guardian
5.0%inclusion1 decks20 decks
3%synergy
Cephalid Illusionist
5.0%inclusion1 decks20 decks
5%synergy
Spellseeker
5.0%inclusion1 decks20 decks
4%synergy
Ruthless Technomancer
5.0%inclusion1 decks20 decks
5%synergy
Malevolent Hermit
5.0%inclusion1 decks20 decks
4%synergy
Fear of Impostors
5.0%inclusion1 decks20 decks
3%synergy
Sage of Mysteries
5.0%inclusion1 decks20 decks
5%synergy
Drana and Linvala
5.0%inclusion1 decks20 decks
3%synergy
Flux Channeler
5.0%inclusion1 decks20 decks
5%synergy
Moon-Blessed Cleric
5.0%inclusion1 decks20 decks
0%synergy
Archaeomancer
5.0%inclusion1 decks20 decks
3%synergy
Tameshi, Reality Architect
5.0%inclusion1 decks20 decks
4%synergy
Nomads en-Kor
5.0%inclusion1 decks20 decks
5%synergy
Auramancer
5.0%inclusion1 decks20 decks
2%synergy
Phantasmal Image
5.0%inclusion1 decks20 decks
2%synergy
Grim Guardian
5.0%inclusion1 decks20 decks
2%synergy
Instants
Swan Song
85%inclusion17 decks20 decks
66%synergy
Pact of Negation
85%inclusion17 decks20 decks
77%synergy
Borne Upon a Wind
65%inclusion13 decks20 decks
60%synergy
Cabal Ritual
60%inclusion12 decks20 decks
57%synergy
Swords to Plowshares
60%inclusion12 decks20 decks
-8%synergy
Fierce Guardianship
60%inclusion12 decks20 decks
39%synergy
Mystical Tutor
60%inclusion12 decks20 decks
48%synergy
Cyclonic Rift
50%inclusion10 decks20 decks
25%synergy
Chain of Vapor
40%inclusion8 decks20 decks
36%synergy
An Offer You Can't Refuse
40%inclusion8 decks20 decks
14%synergy
Gifts Ungiven
40%inclusion8 decks20 decks
38%synergy
Darkblast
35%inclusion7 decks20 decks
35%synergy
Mana Drain
30%inclusion6 decks20 decks
12%synergy
Retraction Helix
25%inclusion5 decks20 decks
24%synergy
Brain Freeze
25%inclusion5 decks20 decks
24%synergy
Banishing Knack
25%inclusion5 decks20 decks
25%synergy
Into the Flood Maw
20%inclusion4 decks20 decks
16%synergy
Culling the Weak
15%inclusion3 decks20 decks
13%synergy
Path to Exile
15%inclusion3 decks20 decks
-27%synergy
Sacrifice
10%inclusion2 decks20 decks
9%synergy
Dispel
10%inclusion2 decks20 decks
6%synergy
Strix Serenade
10%inclusion2 decks20 decks
6%synergy
Ad Nauseam
10%inclusion2 decks20 decks
7%synergy
Sink into Stupor
10%inclusion2 decks20 decks
-2%synergy
Muddle the Mixture
5.0%inclusion1 decks20 decks
1%synergy
Argivian Find
5.0%inclusion1 decks20 decks
5%synergy
Ephemerate
5.0%inclusion1 decks20 decks
1%synergy
Dovin's Veto
5.0%inclusion1 decks20 decks
-20%synergy
Orim's Chant
5.0%inclusion1 decks20 decks
4%synergy
Brainstorm
5.0%inclusion1 decks20 decks
-12%synergy
Spell Snare
5.0%inclusion1 decks20 decks
5%synergy
Lim-Dûl's Vault
5.0%inclusion1 decks20 decks
1%synergy
Thirst for Meaning
5.0%inclusion1 decks20 decks
3%synergy
Rain of Filth
5.0%inclusion1 decks20 decks
5%synergy
Arcane Denial
5.0%inclusion1 decks20 decks
-15%synergy
Stifle
5.0%inclusion1 decks20 decks
4%synergy
Dramatic Reversal
5.0%inclusion1 decks20 decks
3%synergy
March of Swirling Mist
5.0%inclusion1 decks20 decks
4%synergy
Miscast
5.0%inclusion1 decks20 decks
4%synergy
Saw in Half
5.0%inclusion1 decks20 decks
3%synergy
Dig Through Time
5.0%inclusion1 decks20 decks
0%synergy
Sorceries
Imperial Seal
85%inclusion17 decks20 decks
77%synergy
Sevinne's Reclamation
70%inclusion14 decks20 decks
61%synergy
Reanimate
50%inclusion10 decks20 decks
34%synergy
Lively Dirge
45%inclusion9 decks20 decks
44%synergy
Demonic Counsel
30%inclusion6 decks20 decks
29%synergy
Windfall
20%inclusion4 decks20 decks
6%synergy
Yawgmoth's Will
20%inclusion4 decks20 decks
19%synergy
Mnemonic Betrayal
20%inclusion4 decks20 decks
17%synergy
Toxic Deluge
20%inclusion4 decks20 decks
1%synergy
Beseech the Mirror
20%inclusion4 decks20 decks
16%synergy
Unmarked Grave
15%inclusion3 decks20 decks
14%synergy
Timetwister
15%inclusion3 decks20 decks
14%synergy
Cabal Therapy
10%inclusion2 decks20 decks
10%synergy
Diabolic Intent
10%inclusion2 decks20 decks
5%synergy
Resurgent Belief
5.0%inclusion1 decks20 decks
3%synergy
Gitaxian Probe
5.0%inclusion1 decks20 decks
3%synergy
Split Up
5.0%inclusion1 decks20 decks
4%synergy
Careful Study
5.0%inclusion1 decks20 decks
3%synergy
Terminus
5.0%inclusion1 decks20 decks
1%synergy
Replenish
5.0%inclusion1 decks20 decks
3%synergy
Idyllic Tutor
5.0%inclusion1 decks20 decks
1%synergy
Treasure Cruise
5.0%inclusion1 decks20 decks
2%synergy
Vindicate
5.0%inclusion1 decks20 decks
-5%synergy
Lórien Revealed
5.0%inclusion1 decks20 decks
3%synergy
Praetor's Grasp
5.0%inclusion1 decks20 decks
2%synergy
Dark Petition
5.0%inclusion1 decks20 decks
5%synergy
Buried Alive
5.0%inclusion1 decks20 decks
1%synergy
Dark Deal
5.0%inclusion1 decks20 decks
4%synergy
Transmute Artifact
5.0%inclusion1 decks20 decks
3%synergy
Redress Fate
5.0%inclusion1 decks20 decks
-1%synergy
Dance of the Manse
5.0%inclusion1 decks20 decks
1%synergy
Utility Artifacts
The One Ring
75%inclusion15 decks20 decks
61%synergy
Wishclaw Talisman
75%inclusion15 decks20 decks
67%synergy
Vexing Bauble
20%inclusion4 decks20 decks
18%synergy
Agatha's Soul Cauldron
15%inclusion3 decks20 decks
14%synergy
Sphere of Resistance
5.0%inclusion1 decks20 decks
5%synergy
Sensei's Divining Top
5.0%inclusion1 decks20 decks
-5%synergy
Crucible of Worlds
5.0%inclusion1 decks20 decks
4%synergy
Cursed Totem
5.0%inclusion1 decks20 decks
3%synergy
Altar of the Brood
5.0%inclusion1 decks20 decks
4%synergy
Isochron Scepter
5.0%inclusion1 decks20 decks
3%synergy
Imposter Mech
5.0%inclusion1 decks20 decks
3%synergy
Enchantments
Tinybones Joins Up
80%inclusion16 decks20 decks
79%synergy
Blind Obedience
65%inclusion13 decks20 decks
52%synergy
Copy Artifact
65%inclusion13 decks20 decks
64%synergy
Amphibian Downpour
65%inclusion13 decks20 decks
60%synergy
Steal Enchantment
55%inclusion11 decks20 decks
54%synergy
Chains of Mephistopheles
55%inclusion11 decks20 decks
55%synergy
The Meathook Massacre
50%inclusion10 decks20 decks
46%synergy
Necropotence
50%inclusion10 decks20 decks
43%synergy
Counterbalance
40%inclusion8 decks20 decks
38%synergy
Mirrormade
40%inclusion8 decks20 decks
30%synergy
Touch the Spirit Realm
35%inclusion7 decks20 decks
32%synergy
Ripples of Undeath
30%inclusion6 decks20 decks
27%synergy
Static Prison
30%inclusion6 decks20 decks
29%synergy
Founding the Third Path
25%inclusion5 decks20 decks
25%synergy
Teval's Judgment
22%inclusion2 decks9 decks
21%synergy
Seal of Cleansing
15%inclusion3 decks20 decks
13%synergy
Monologue Tax
15%inclusion3 decks20 decks
9%synergy
Trouble in Pairs
15%inclusion3 decks20 decks
9%synergy
Attunement
10%inclusion2 decks20 decks
10%synergy
Seal of Removal
10%inclusion2 decks20 decks
9%synergy
Waste Not
5.0%inclusion1 decks20 decks
5%synergy
One with the Multiverse
5.0%inclusion1 decks20 decks
0%synergy
Parallax Wave
5.0%inclusion1 decks20 decks
5%synergy
Unnatural Selection
5.0%inclusion1 decks20 decks
5%synergy
Curse of Silence
5.0%inclusion1 decks20 decks
5%synergy
Parallax Nexus
5.0%inclusion1 decks20 decks
5%synergy
Spirit Mirror
5.0%inclusion1 decks20 decks
5%synergy
Opalescence
5.0%inclusion1 decks20 decks
5%synergy
Dance of Many
5.0%inclusion1 decks20 decks
5%synergy
Omniscience
5.0%inclusion1 decks20 decks
1%synergy
Kismet
5.0%inclusion1 decks20 decks
5%synergy
Spirit-Sister's Call
5.0%inclusion1 decks20 decks
4%synergy
Copy Enchantment
5.0%inclusion1 decks20 decks
0%synergy
Starfield of Nyx
5.0%inclusion1 decks20 decks
1%synergy
Power Artifact
5.0%inclusion1 decks20 decks
5%synergy
Leyline of Anticipation
5.0%inclusion1 decks20 decks
0%synergy
Chthonian Nightmare
5.0%inclusion1 decks20 decks
4%synergy
Black Market Connections
5.0%inclusion1 decks20 decks
-9%synergy
Parallax Tide
5.0%inclusion1 decks20 decks
5%synergy
Aura of Silence
5.0%inclusion1 decks20 decks
2%synergy
Ghostly Prison
5.0%inclusion1 decks20 decks
-16%synergy
Propaganda
5.0%inclusion1 decks20 decks
-21%synergy
Leyline of the Void
5.0%inclusion1 decks20 decks
4%synergy
Pure Reflection
5.0%inclusion1 decks20 decks
5%synergy
Planeswalkers
Teferi, Time Raveler
40%inclusion8 decks20 decks
32%synergy
Tezzeret, Cruel Captain
14%inclusion1 decks7 decks
12%synergy
Utility Lands
Otawara, Soaring City
90%inclusion18 decks20 decks
71%synergy
City of Traitors
35%inclusion7 decks20 decks
34%synergy
Emergence Zone
30%inclusion6 decks20 decks
28%synergy
Minamo, School at Water's Edge
25%inclusion5 decks20 decks
21%synergy
Serra's Sanctum
25%inclusion5 decks20 decks
23%synergy
Urza's Saga
25%inclusion5 decks20 decks
13%synergy
Cephalid Coliseum
25%inclusion5 decks20 decks
21%synergy
Wasteland
10%inclusion2 decks20 decks
9%synergy
Hall of Heliod's Generosity
10%inclusion2 decks20 decks
-3%synergy
Bazaar of Baghdad
10%inclusion2 decks20 decks
10%synergy
Strip Mine
10%inclusion2 decks20 decks
8%synergy
Mystic Sanctuary
5.0%inclusion1 decks20 decks
1%synergy
Phyrexian Tower
5.0%inclusion1 decks20 decks
1%synergy
Arcane Lighthouse
5.0%inclusion1 decks20 decks
4%synergy
Treasure Vault
5.0%inclusion1 decks20 decks
4%synergy
Crystal Vein
5.0%inclusion1 decks20 decks
5%synergy
Cabal Pit
5.0%inclusion1 decks20 decks
5%synergy
Karn's Bastion
5.0%inclusion1 decks20 decks
4%synergy
Saprazzan Skerry
5.0%inclusion1 decks20 decks
5%synergy
Mana Artifacts
Arcane Signet
100%inclusion20 decks20 decks
12%synergy
Sol Ring
100%inclusion20 decks20 decks
10%synergy
Lotus Petal
90%inclusion18 decks20 decks
79%synergy
Lion's Eye Diamond
80%inclusion16 decks20 decks
78%synergy
Mox Opal
75%inclusion15 decks20 decks
66%synergy
Talisman of Dominance
70%inclusion14 decks20 decks
21%synergy
Grim Monolith
55%inclusion11 decks20 decks
51%synergy
Fellwar Stone
55%inclusion11 decks20 decks
21%synergy
Talisman of Progress
45%inclusion9 decks20 decks
2%synergy
Mox Amber
25%inclusion5 decks20 decks
19%synergy
Talisman of Hierarchy
15%inclusion3 decks20 decks
-28%synergy
Springleaf Drum
5.0%inclusion1 decks20 decks
3%synergy
Lands
Tundra
100%inclusion20 decks20 decks
84%synergy
Underground Sea
100%inclusion20 decks20 decks
84%synergy
Godless Shrine
100%inclusion20 decks20 decks
50%synergy
Scrubland
100%inclusion20 decks20 decks
84%synergy
Marsh Flats
100%inclusion20 decks20 decks
64%synergy
Polluted Delta
100%inclusion20 decks20 decks
63%synergy
Hallowed Fountain
100%inclusion20 decks20 decks
51%synergy
Flooded Strand
100%inclusion20 decks20 decks
62%synergy
Watery Grave
100%inclusion20 decks20 decks
51%synergy
Command Tower
95%inclusion19 decks20 decks
3%synergy
Mana Confluence
95%inclusion19 decks20 decks
81%synergy
Gemstone Caverns
90%inclusion18 decks20 decks
82%synergy
Scalding Tarn
90%inclusion18 decks20 decks
79%synergy
Bloodstained Mire
90%inclusion18 decks20 decks
79%synergy
Verdant Catacombs
85%inclusion17 decks20 decks
75%synergy
City of Brass
85%inclusion17 decks20 decks
70%synergy
Misty Rainforest
80%inclusion16 decks20 decks
69%synergy
Windswept Heath
80%inclusion16 decks20 decks
70%synergy
Undercity Sewers
75%inclusion15 decks20 decks
61%synergy
Exotic Orchard
65%inclusion13 decks20 decks
7%synergy
Morphic Pool
65%inclusion13 decks20 decks
31%synergy
Arid Mesa
65%inclusion13 decks20 decks
55%synergy
Sea of Clouds
50%inclusion10 decks20 decks
14%synergy
Vault of Champions
50%inclusion10 decks20 decks
17%synergy
Island
45%inclusion9 decks20 decks
-48%synergy
Swamp
30%inclusion6 decks20 decks
-61%synergy
Starting Town
25%inclusion2 decks8 decks
21%synergy
Meticulous Archive
20%inclusion4 decks20 decks
6%synergy
Forbidden Orchard
15%inclusion3 decks20 decks
12%synergy
Shadowy Backstreet
10%inclusion2 decks20 decks
-2%synergy
Spire of Industry
10%inclusion2 decks20 decks
1%synergy
Tarnished Citadel
10%inclusion2 decks20 decks
9%synergy
Raffine's Tower
10%inclusion2 decks20 decks
-31%synergy
Cavern of Souls
10%inclusion2 decks20 decks
3%synergy
Plains
10%inclusion2 decks20 decks
-81%synergy
Sink into Stupor
10%inclusion2 decks20 decks
-2%synergy
Gloomlake Verge
10%inclusion2 decks20 decks
-1%synergy
Prismatic Vista
5.0%inclusion1 decks20 decks
1%synergy
Gemstone Mine
5.0%inclusion1 decks20 decks
5%synergy
Prairie Stream
5.0%inclusion1 decks20 decks
-36%synergy
Silent Clearing
5.0%inclusion1 decks20 decks
2%synergy
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