The Master of Keys (Commander)

Background image for What if Thassa's Oracle Were Banned?
Harvey McGuinness
Sep 23, 2025
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.
Deck Filters
Cardsphere
Archidekt
Commander Spellbook
Moxfield
Scryfall
MTGStocks
Noggle the Mind
4.0%inclusion15 decks376 decks
4%synergy
Mornsong Aria
1.9%inclusion8 decks422 decks
1%synergy
Twilight Diviner
1.6%inclusion6 decks376 decks
1%synergy
Grave Venerations
1.0%inclusion4 decks411 decks
1%synergy
Thirst for Identity
0.8%inclusion3 decks376 decks
0%synergy
High Synergy Cards
Animate Dead
68%inclusion4.62K decks6.78K decks
58%synergy
Ripples of Undeath
61%inclusion4.12K decks6.78K decks
58%synergy
Dress Down
58%inclusion3.93K decks6.78K decks
56%synergy
Necromancy
56%inclusion3.81K decks6.78K decks
52%synergy
Inquisitive Glimmer
57%inclusion3.83K decks6.78K decks
49%synergy
Mesa Enchantress
52%inclusion3.54K decks6.78K decks
43%synergy
Entity Tracker
49%inclusion3.31K decks6.78K decks
42%synergy
Starfield Mystic
49%inclusion3.32K decks6.78K decks
42%synergy
Gravebreaker Lamia
42%inclusion2.84K decks6.78K decks
41%synergy
Demon of Fate's Design
45%inclusion3.06K decks6.78K decks
40%synergy
Top Cards
Swords to Plowshares
62%inclusion4.21K decks6.78K decks
-6%synergy
Mystic Remora
60%inclusion4.07K decks6.78K decks
39%synergy
Sevinne's Reclamation
47%inclusion3.19K decks6.78K decks
38%synergy
Mirrormade
46%inclusion3.11K decks6.78K decks
36%synergy
Entomb
44%inclusion3K decks6.78K decks
37%synergy
Fear of Sleep Paralysis
42%inclusion2.83K decks6.78K decks
36%synergy
Blind Obedience
42%inclusion2.83K decks6.78K decks
29%synergy
Doomwake Giant
41%inclusion2.79K decks6.78K decks
35%synergy
Dark Ritual
41%inclusion2.75K decks6.78K decks
21%synergy
Sphere of Safety
40%inclusion2.70K decks6.78K decks
30%synergy
Game Changers
Smothering Tithe
52%inclusion3.50K decks6.78K decks
20%synergy
Rhystic Study
49%inclusion3.35K decks6.78K decks
17%synergy
Enlightened Tutor
39%inclusion2.63K decks6.78K decks
19%synergy
Demonic Tutor
33%inclusion2.24K decks6.78K decks
12%synergy
Thassa's Oracle
30%inclusion2.06K decks6.78K decks
21%synergy
Vampiric Tutor
30%inclusion2.06K decks6.78K decks
13%synergy
Ancient Tomb
27%inclusion1.83K decks6.78K decks
14%synergy
Mana Vault
26%inclusion1.78K decks6.78K decks
17%synergy
Force of Will
26%inclusion1.78K decks6.78K decks
13%synergy
Fierce Guardianship
26%inclusion1.78K decks6.78K decks
6%synergy
Creatures
Scrabbling Skullcrab
39%inclusion2.63K decks6.78K decks
38%synergy
Ondu Spiritdancer
37%inclusion2.48K decks6.78K decks
30%synergy
Abdel Adrian, Gorion's Ward
36%inclusion2.42K decks6.78K decks
34%synergy
Overlord of the Floodpits
35%inclusion2.34K decks6.78K decks
31%synergy
Esper Sentinel
34%inclusion2.31K decks6.78K decks
6%synergy
Overlord of the Balemurk
34%inclusion2.28K decks6.78K decks
32%synergy
Victor, Valgavoth's Seneschal
32%inclusion2.18K decks6.78K decks
30%synergy
Fear of Impostors
29%inclusion1.99K decks6.78K decks
28%synergy
Grand Abolisher
29%inclusion1.95K decks6.78K decks
14%synergy
Zur, Eternal Schemer
28%inclusion1.93K decks6.78K decks
25%synergy
Lotho, Corrupt Shirriff
28%inclusion1.86K decks6.78K decks
11%synergy
Orcish Bowmasters
24%inclusion1.63K decks6.78K decks
13%synergy
Ghostly Dancers
24%inclusion1.62K decks6.78K decks
21%synergy
Valley Floodcaller
24%inclusion1.62K decks6.78K decks
20%synergy
Zur the Enchanter
22%inclusion1.51K decks6.78K decks
17%synergy
Soaring Lightbringer
22%inclusion1.51K decks6.78K decks
17%synergy
Silent Hallcreeper
22%inclusion1.49K decks6.78K decks
18%synergy
Hullbreaker Horror
22%inclusion1.47K decks6.78K decks
15%synergy
Enduring Curiosity
21%inclusion1.41K decks6.78K decks
13%synergy
Ranger-Captain of Eos
21%inclusion1.39K decks6.78K decks
14%synergy
Moon-Blessed Cleric
20%inclusion1.36K decks6.78K decks
15%synergy
Heliod, the Radiant Dawn
20%inclusion1.36K decks6.78K decks
16%synergy
Grim Guardian
19%inclusion1.30K decks6.78K decks
17%synergy
Displacer Kitten
19%inclusion1.30K decks6.78K decks
12%synergy
Aminatou, Veil Piercer
18%inclusion1.25K decks6.78K decks
17%synergy
Archon of Sun's Grace
17%inclusion1.18K decks6.78K decks
13%synergy
Opposition Agent
16%inclusion1.10K decks6.78K decks
7%synergy
Ledger Shredder
14%inclusion937 decks6.78K decks
5%synergy
Athreos, Shroud-Veiled
14%inclusion924 decks6.78K decks
9%synergy
Lurrus of the Dream-Den
14%inclusion919 decks6.78K decks
12%synergy
Mindwrack Harpy
14%inclusion915 decks6.78K decks
13%synergy
Drannith Magistrate
13%inclusion889 decks6.78K decks
5%synergy
Archetype of Imagination
12%inclusion819 decks6.78K decks
7%synergy
Overlord of the Mistmoors
12%inclusion814 decks6.78K decks
10%synergy
Mockingbird
12%inclusion789 decks6.78K decks
7%synergy
Voice of Victory
11%inclusion418 decks3.66K decks
3%synergy
Archivist of Oghma
11%inclusion767 decks6.78K decks
5%synergy
Ancient Cellarspawn
11%inclusion762 decks6.78K decks
8%synergy
Sage of Mysteries
11%inclusion762 decks6.78K decks
11%synergy
Hedron Crab
11%inclusion757 decks6.78K decks
11%synergy
Talion, the Kindly Lord
11%inclusion750 decks6.78K decks
3%synergy
Alseid of Life's Bounty
11%inclusion746 decks6.78K decks
10%synergy
Balemurk Leech
10%inclusion692 decks6.78K decks
10%synergy
Skullsnap Nuisance
10%inclusion680 decks6.78K decks
10%synergy
Auriok Salvagers
10%inclusion651 decks6.78K decks
9%synergy
Spirited Companion
10%inclusion649 decks6.78K decks
8%synergy
Phyrexian Metamorph
9.2%inclusion625 decks6.78K decks
1%synergy
Gremlin Tamer
9.1%inclusion616 decks6.78K decks
8%synergy
Nashi, Searcher in the Dark
8.9%inclusion602 decks6.78K decks
8%synergy
Fear of Infinity
7.6%inclusion516 decks6.78K decks
7%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.42K decks6.78K decks
9%synergy
Swan Song
32%inclusion2.20K decks6.78K decks
13%synergy
Path to Exile
30%inclusion2.05K decks6.78K decks
-12%synergy
Counterspell
29%inclusion1.96K decks6.78K decks
-12%synergy
Silence
27%inclusion1.84K decks6.78K decks
17%synergy
Arcane Denial
26%inclusion1.78K decks6.78K decks
6%synergy
Cyclonic Rift
25%inclusion1.69K decks6.78K decks
1%synergy
Force of Negation
24%inclusion1.64K decks6.78K decks
12%synergy
Flusterstorm
24%inclusion1.61K decks6.78K decks
15%synergy
Demonic Consultation
23%inclusion1.58K decks6.78K decks
15%synergy
Tainted Pact
23%inclusion1.58K decks6.78K decks
16%synergy
Mindbreak Trap
22%inclusion1.47K decks6.78K decks
15%synergy
Intuition
21%inclusion1.42K decks6.78K decks
19%synergy
Mystical Tutor
21%inclusion1.40K decks6.78K decks
9%synergy
Pact of Negation
21%inclusion1.40K decks6.78K decks
13%synergy
Borne Upon a Wind
20%inclusion1.35K decks6.78K decks
15%synergy
Mental Misstep
20%inclusion1.34K decks6.78K decks
13%synergy
Mana Drain
18%inclusion1.24K decks6.78K decks
1%synergy
Cabal Ritual
17%inclusion1.19K decks6.78K decks
14%synergy
Sink into Stupor
15%inclusion1.03K decks6.78K decks
2%synergy
Void Rend
15%inclusion1.02K decks6.78K decks
-19%synergy
Thirst for Meaning
15%inclusion991 decks6.78K decks
13%synergy
Dovin's Veto
14%inclusion970 decks6.78K decks
-11%synergy
Otherworldly Gaze
13%inclusion867 decks6.78K decks
11%synergy
Inkshield
13%inclusion862 decks6.78K decks
3%synergy
Frantic Search
12%inclusion837 decks6.78K decks
-5%synergy
Chain of Vapor
12%inclusion780 decks6.78K decks
8%synergy
Brainstorm
10%inclusion700 decks6.78K decks
-7%synergy
Into the Flood Maw
10%inclusion681 decks6.78K decks
6%synergy
Negate
10%inclusion680 decks6.78K decks
-6%synergy
Gifts Ungiven
8.7%inclusion591 decks6.78K decks
6%synergy
Anguished Unmaking
8.4%inclusion567 decks6.78K decks
-17%synergy
Teferi's Protection
6.8%inclusion464 decks6.78K decks
-10%synergy
Fell the Profane
6.4%inclusion435 decks6.78K decks
-2%synergy
Ad Nauseam
5.9%inclusion397 decks6.78K decks
3%synergy
Utter End
5.8%inclusion393 decks6.78K decks
-1%synergy
Retraction Helix
5.4%inclusion368 decks6.78K decks
5%synergy
Deadly Rollick
5.4%inclusion368 decks6.78K decks
-9%synergy
Generous Gift
5.4%inclusion366 decks6.78K decks
-9%synergy
Brain Freeze
5.3%inclusion358 decks6.78K decks
5%synergy
Sorceries
Redress Fate
30%inclusion2.01K decks6.78K decks
24%synergy
Windfall
28%inclusion1.88K decks6.78K decks
14%synergy
Reanimate
26%inclusion1.77K decks6.78K decks
10%synergy
Toxic Deluge
22%inclusion1.47K decks6.78K decks
2%synergy
Imperial Seal
19%inclusion1.28K decks6.78K decks
11%synergy
Singularity Rupture
15%inclusion347 decks2.31K decks
13%synergy
Extinguish All Hope
14%inclusion980 decks6.78K decks
13%synergy
Dance of the Manse
14%inclusion969 decks6.78K decks
11%synergy
Time Wipe
12%inclusion784 decks6.78K decks
5%synergy
Damn
11%inclusion715 decks6.78K decks
-10%synergy
Demonic Counsel
10%inclusion697 decks6.78K decks
9%synergy
Idyllic Tutor
9.2%inclusion626 decks6.78K decks
5%synergy
Lively Dirge
9.0%inclusion612 decks6.78K decks
8%synergy
Supreme Verdict
9.0%inclusion607 decks6.78K decks
-6%synergy
Resurgent Belief
8.6%inclusion585 decks6.78K decks
7%synergy
Beseech the Mirror
8.5%inclusion577 decks6.78K decks
4%synergy
Glimpse the Unthinkable
8.4%inclusion567 decks6.78K decks
8%synergy
Unmarked Grave
8.3%inclusion565 decks6.78K decks
7%synergy
Ponder
7.9%inclusion534 decks6.78K decks
-1%synergy
Space-Time Anomaly
7.6%inclusion171 decks2.25K decks
6%synergy
Replenish
7.4%inclusion500 decks6.78K decks
6%synergy
Buried Alive
7.1%inclusion483 decks6.78K decks
3%synergy
Mnemonic Betrayal
6.8%inclusion463 decks6.78K decks
4%synergy
Farewell
5.4%inclusion367 decks6.78K decks
-8%synergy
Utility Artifacts
The One Ring
25%inclusion1.66K decks6.78K decks
11%synergy
Wishclaw Talisman
21%inclusion1.42K decks6.78K decks
13%synergy
Mesmeric Orb
15%inclusion1.04K decks6.78K decks
14%synergy
Cloud Key
9.4%inclusion637 decks6.78K decks
6%synergy
Lightning Greaves
8.2%inclusion553 decks6.78K decks
-14%synergy
Swiftfoot Boots
5.5%inclusion370 decks6.78K decks
-19%synergy
Keys to the House
5.4%inclusion366 decks6.75K decks
5%synergy
Enchantments
Dance of the Dead
40%inclusion2.68K decks6.78K decks
37%synergy
Secret Arcade // Dusty Parlor
37%inclusion2.50K decks6.78K decks
32%synergy
Amphibian Downpour
36%inclusion2.44K decks6.78K decks
31%synergy
Propaganda
34%inclusion2.32K decks6.78K decks
7%synergy
Sigil of the Empty Throne
33%inclusion2.26K decks6.78K decks
27%synergy
Grasp of Fate
30%inclusion2.03K decks6.78K decks
24%synergy
Seal of Cleansing
29%inclusion1.95K decks6.78K decks
27%synergy
Ghostly Prison
29%inclusion1.94K decks6.78K decks
7%synergy
Cemetery Tampering
28%inclusion1.89K decks6.78K decks
27%synergy
Monologue Tax
25%inclusion1.71K decks6.78K decks
19%synergy
Starfield of Nyx
25%inclusion1.70K decks6.78K decks
21%synergy
Necropotence
25%inclusion1.66K decks6.78K decks
18%synergy
Estrid's Invocation
23%inclusion1.55K decks6.78K decks
18%synergy
Touch the Spirit Realm
22%inclusion1.46K decks6.78K decks
19%synergy
The Meathook Massacre
21%inclusion1.45K decks6.78K decks
18%synergy
Cacophony Unleashed
21%inclusion1.41K decks6.78K decks
19%synergy
Shark Typhoon
21%inclusion1.40K decks6.78K decks
15%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.38K decks6.75K decks
20%synergy
Darksteel Mutation
20%inclusion1.37K decks6.78K decks
14%synergy
Tinybones Joins Up
20%inclusion1.33K decks6.78K decks
18%synergy
Stillness in Motion
18%inclusion623 decks3.55K decks
17%synergy
All That Glitters
17%inclusion1.14K decks6.78K decks
8%synergy
Static Prison
17%inclusion1.13K decks6.78K decks
16%synergy
Polluted Cistern // Dim Oubliette
17%inclusion1.12K decks6.77K decks
16%synergy
Extravagant Replication
16%inclusion1.11K decks6.78K decks
11%synergy
Timely Ward
16%inclusion1.10K decks6.78K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.06K decks6.78K decks
15%synergy
Copy Enchantment
16%inclusion1.06K decks6.78K decks
11%synergy
Seal of Removal
16%inclusion1.06K decks6.78K decks
15%synergy
Phyrexian Arena
16%inclusion1.06K decks6.78K decks
2%synergy
Ethereal Armor
15%inclusion1.02K decks6.78K decks
10%synergy
Black Market Connections
15%inclusion1.01K decks6.78K decks
1%synergy
Out of the Tombs
15%inclusion1K decks6.78K decks
14%synergy
Greater Auramancy
15%inclusion996 decks6.78K decks
10%synergy
Imprisoned in the Moon
14%inclusion974 decks6.78K decks
8%synergy
Bottomless Pool // Locker Room
14%inclusion916 decks6.78K decks
12%synergy
Hallowed Haunting
13%inclusion911 decks6.78K decks
11%synergy
The Eldest Reborn
13%inclusion896 decks6.78K decks
11%synergy
Leyline of Anticipation
13%inclusion884 decks6.78K decks
9%synergy
Restricted Office // Lecture Hall
13%inclusion873 decks6.78K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion863 decks6.78K decks
10%synergy
Trouble in Pairs
13%inclusion855 decks6.78K decks
7%synergy
Cramped Vents // Access Maze
13%inclusion854 decks6.78K decks
10%synergy
Court of Cunning
12%inclusion812 decks6.78K decks
11%synergy
Copy Artifact
11%inclusion763 decks6.78K decks
10%synergy
Sheltered by Ghosts
11%inclusion759 decks6.78K decks
9%synergy
Central Elevator // Promising Stairs
10%inclusion710 decks6.78K decks
10%synergy
Dazzling Theater // Prop Room
10%inclusion707 decks6.75K decks
9%synergy
One with the Multiverse
10%inclusion709 decks6.78K decks
6%synergy
Teval's Judgment
10%inclusion375 decks3.63K decks
10%synergy
Battles
Invasion of Theros
6.0%inclusion409 decks6.78K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
19%inclusion1.27K decks6.78K decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.27K decks6.78K decks
35%synergy
Otawara, Soaring City
34%inclusion2.28K decks6.78K decks
14%synergy
Bojuka Bog
32%inclusion2.15K decks6.78K decks
5%synergy
Urza's Saga
16%inclusion1.05K decks6.78K decks
4%synergy
Cephalid Coliseum
14%inclusion964 decks6.78K decks
11%synergy
Reliquary Tower
13%inclusion888 decks6.78K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion861 decks6.78K decks
6%synergy
Halimar Depths
10%inclusion698 decks6.78K decks
6%synergy
Emergence Zone
10%inclusion659 decks6.78K decks
8%synergy
Urborg, Tomb of Yawgmoth
10%inclusion651 decks6.78K decks
-4%synergy
Serra's Sanctum
9.1%inclusion620 decks6.78K decks
7%synergy
Minamo, School at Water's Edge
9.1%inclusion619 decks6.78K decks
5%synergy
Mana Artifacts
Sol Ring
91%inclusion6.16K decks6.78K decks
1%synergy
Arcane Signet
90%inclusion6.13K decks6.78K decks
3%synergy
Talisman of Dominance
58%inclusion3.96K decks6.78K decks
9%synergy
Talisman of Progress
51%inclusion3.43K decks6.78K decks
7%synergy
Talisman of Hierarchy
44%inclusion2.98K decks6.78K decks
0%synergy
Fellwar Stone
44%inclusion2.96K decks6.78K decks
10%synergy
Azorius Signet
34%inclusion2.27K decks6.78K decks
2%synergy
Orzhov Signet
32%inclusion2.17K decks6.78K decks
-2%synergy
Lotus Petal
27%inclusion1.82K decks6.78K decks
16%synergy
Chrome Mox
24%inclusion1.63K decks6.78K decks
15%synergy
Dimir Signet
24%inclusion1.62K decks6.78K decks
-8%synergy
Mox Diamond
20%inclusion1.37K decks6.78K decks
13%synergy
Mox Opal
20%inclusion1.34K decks6.78K decks
11%synergy
Lion's Eye Diamond
15%inclusion1.05K decks6.78K decks
13%synergy
Mind Stone
15%inclusion1.01K decks6.78K decks
2%synergy
Commander's Sphere
12%inclusion818 decks6.78K decks
-7%synergy
Mox Amber
11%inclusion740 decks6.78K decks
5%synergy
Grim Monolith
8.9%inclusion604 decks6.78K decks
5%synergy
Thought Vessel
6.5%inclusion442 decks6.78K decks
-18%synergy
Chromatic Lantern
6.0%inclusion408 decks6.78K decks
-7%synergy
Lands
Command Tower
94%inclusion6.35K decks6.78K decks
1%synergy
Island
85%inclusion5.76K decks6.78K decks
-8%synergy
Swamp
82%inclusion5.59K decks6.78K decks
-9%synergy
Plains
81%inclusion5.48K decks6.78K decks
-11%synergy
Watery Grave
58%inclusion3.96K decks6.78K decks
8%synergy
Godless Shrine
58%inclusion3.94K decks6.78K decks
8%synergy
Hallowed Fountain
58%inclusion3.92K decks6.78K decks
8%synergy
Exotic Orchard
55%inclusion3.75K decks6.78K decks
-3%synergy
Flooded Strand
52%inclusion3.55K decks6.78K decks
14%synergy
Polluted Delta
52%inclusion3.53K decks6.78K decks
14%synergy
Marsh Flats
49%inclusion3.33K decks6.78K decks
13%synergy
Arcane Sanctum
46%inclusion3.13K decks6.78K decks
-8%synergy
Caves of Koilos
44%inclusion3.01K decks6.78K decks
9%synergy
Adarkar Wastes
44%inclusion2.95K decks6.78K decks
12%synergy
Underground River
42%inclusion2.82K decks6.78K decks
8%synergy
Morphic Pool
40%inclusion2.73K decks6.78K decks
6%synergy
Sea of Clouds
40%inclusion2.68K decks6.78K decks
4%synergy
Vault of Champions
37%inclusion2.48K decks6.78K decks
4%synergy
Undercity Sewers
35%inclusion2.35K decks6.78K decks
20%synergy
Raffine's Tower
34%inclusion2.29K decks6.78K decks
-7%synergy
Glacial Fortress
29%inclusion1.97K decks6.78K decks
-11%synergy
City of Brass
28%inclusion1.93K decks6.78K decks
13%synergy
Isolated Chapel
28%inclusion1.89K decks6.78K decks
-11%synergy
Meticulous Archive
28%inclusion1.86K decks6.78K decks
14%synergy
Tundra
28%inclusion1.86K decks6.78K decks
12%synergy
Scrubland
28%inclusion1.86K decks6.78K decks
11%synergy
Underground Sea
27%inclusion1.83K decks6.78K decks
11%synergy
Mana Confluence
27%inclusion1.80K decks6.78K decks
13%synergy
Bloodstained Mire
26%inclusion1.76K decks6.78K decks
15%synergy
Misty Rainforest
26%inclusion1.75K decks6.78K decks
15%synergy
Shadowy Backstreet
26%inclusion1.74K decks6.78K decks
13%synergy
Drowned Catacomb
24%inclusion1.64K decks6.78K decks
-12%synergy
Verdant Catacombs
24%inclusion1.63K decks6.78K decks
14%synergy
Scalding Tarn
23%inclusion1.58K decks6.78K decks
12%synergy
Prairie Stream
23%inclusion1.57K decks6.78K decks
-18%synergy
Windswept Heath
22%inclusion1.52K decks6.78K decks
13%synergy
Valgavoth's Lair
22%inclusion1.52K decks6.78K decks
20%synergy
Evolving Wilds
22%inclusion1.51K decks6.78K decks
-3%synergy
Gemstone Caverns
22%inclusion1.51K decks6.78K decks
14%synergy
Sunken Hollow
22%inclusion1.47K decks6.78K decks
-18%synergy
Terramorphic Expanse
21%inclusion1.46K decks6.78K decks
5%synergy
Temple of Enlightenment
21%inclusion1.44K decks6.78K decks
5%synergy
Temple of Silence
21%inclusion1.42K decks6.78K decks
2%synergy
Arid Mesa
20%inclusion1.38K decks6.78K decks
10%synergy
Temple of Deceit
20%inclusion1.37K decks6.78K decks
2%synergy
Obscura Storefront
20%inclusion1.32K decks6.78K decks
9%synergy
Tainted Field
19%inclusion1.26K decks6.78K decks
12%synergy
Azorius Chancery
18%inclusion1.25K decks6.78K decks
4%synergy
Tainted Isle
18%inclusion1.23K decks6.78K decks
12%synergy
Dimir Aqueduct
18%inclusion1.20K decks6.78K decks
4%synergy