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
5.1%inclusion41 decks806 decks
4%synergy
Twilight Diviner
4.0%inclusion32 decks806 decks
3%synergy
Mornsong Aria
3.2%inclusion27 decks851 decks
2%synergy
Thirst for Identity
2.0%inclusion16 decks806 decks
1%synergy
Grave Venerations
1.7%inclusion14 decks840 decks
1%synergy
High Synergy Cards
Ripples of Undeath
61%inclusion4.32K decks7.07K decks
58%synergy
Animate Dead
68%inclusion4.80K decks7.07K decks
58%synergy
Dress Down
58%inclusion4.09K decks7.07K decks
55%synergy
Necromancy
56%inclusion3.97K decks7.07K decks
52%synergy
Inquisitive Glimmer
57%inclusion4.04K decks7.07K decks
50%synergy
Mesa Enchantress
53%inclusion3.72K decks7.07K decks
44%synergy
Entity Tracker
49%inclusion3.47K decks7.07K decks
43%synergy
Starfield Mystic
49%inclusion3.48K decks7.07K decks
43%synergy
Gravebreaker Lamia
42%inclusion2.99K decks7.07K decks
41%synergy
Demon of Fate's Design
45%inclusion3.20K decks7.07K decks
40%synergy
Top Cards
Swords to Plowshares
62%inclusion4.36K decks7.07K decks
-7%synergy
Mystic Remora
60%inclusion4.22K decks7.07K decks
39%synergy
Sevinne's Reclamation
47%inclusion3.35K decks7.07K decks
38%synergy
Mirrormade
46%inclusion3.25K decks7.07K decks
36%synergy
Entomb
44%inclusion3.13K decks7.07K decks
37%synergy
Fear of Sleep Paralysis
42%inclusion2.96K decks7.07K decks
36%synergy
Blind Obedience
41%inclusion2.91K decks7.07K decks
29%synergy
Doomwake Giant
41%inclusion2.91K decks7.07K decks
35%synergy
Dark Ritual
40%inclusion2.85K decks7.07K decks
21%synergy
Sphere of Safety
40%inclusion2.82K decks7.07K decks
30%synergy
Game Changers
Smothering Tithe
51%inclusion3.62K decks7.07K decks
20%synergy
Rhystic Study
49%inclusion3.46K decks7.07K decks
17%synergy
Enlightened Tutor
38%inclusion2.71K decks7.07K decks
19%synergy
Demonic Tutor
33%inclusion2.32K decks7.07K decks
12%synergy
Vampiric Tutor
30%inclusion2.13K decks7.07K decks
13%synergy
Thassa's Oracle
30%inclusion2.12K decks7.07K decks
20%synergy
Ancient Tomb
26%inclusion1.87K decks7.07K decks
14%synergy
Mana Vault
26%inclusion1.83K decks7.07K decks
17%synergy
Force of Will
26%inclusion1.82K decks7.07K decks
13%synergy
Fierce Guardianship
26%inclusion1.81K decks7.07K decks
5%synergy
Creatures
Scrabbling Skullcrab
39%inclusion2.77K decks7.07K decks
38%synergy
Ondu Spiritdancer
37%inclusion2.58K decks7.07K decks
30%synergy
Abdel Adrian, Gorion's Ward
35%inclusion2.50K decks7.07K decks
34%synergy
Overlord of the Floodpits
35%inclusion2.46K decks7.07K decks
31%synergy
Esper Sentinel
34%inclusion2.40K decks7.07K decks
6%synergy
Overlord of the Balemurk
34%inclusion2.40K decks7.07K decks
32%synergy
Victor, Valgavoth's Seneschal
32%inclusion2.29K decks7.07K decks
30%synergy
Fear of Impostors
30%inclusion2.10K decks7.07K decks
28%synergy
Zur, Eternal Schemer
29%inclusion2.04K decks7.07K decks
26%synergy
Grand Abolisher
28%inclusion2.01K decks7.07K decks
14%synergy
Lotho, Corrupt Shirriff
27%inclusion1.93K decks7.07K decks
10%synergy
Ghostly Dancers
24%inclusion1.69K decks7.07K decks
21%synergy
Orcish Bowmasters
24%inclusion1.67K decks7.07K decks
13%synergy
Valley Floodcaller
24%inclusion1.67K decks7.07K decks
19%synergy
Silent Hallcreeper
22%inclusion1.59K decks7.07K decks
18%synergy
Zur the Enchanter
22%inclusion1.59K decks7.07K decks
17%synergy
Soaring Lightbringer
22%inclusion1.57K decks7.07K decks
17%synergy
Hullbreaker Horror
21%inclusion1.50K decks7.07K decks
15%synergy
Enduring Curiosity
21%inclusion1.47K decks7.07K decks
13%synergy
Ranger-Captain of Eos
20%inclusion1.43K decks7.07K decks
14%synergy
Heliod, the Radiant Dawn
20%inclusion1.42K decks7.07K decks
16%synergy
Moon-Blessed Cleric
20%inclusion1.41K decks7.07K decks
15%synergy
Grim Guardian
19%inclusion1.38K decks7.07K decks
17%synergy
Displacer Kitten
19%inclusion1.33K decks7.07K decks
12%synergy
Aminatou, Veil Piercer
18%inclusion1.30K decks7.07K decks
17%synergy
Archon of Sun's Grace
17%inclusion1.23K decks7.07K decks
13%synergy
Opposition Agent
16%inclusion1.12K decks7.07K decks
7%synergy
Ledger Shredder
14%inclusion961 decks7.07K decks
5%synergy
Athreos, Shroud-Veiled
14%inclusion955 decks7.07K decks
9%synergy
Mindwrack Harpy
13%inclusion948 decks7.07K decks
13%synergy
Lurrus of the Dream-Den
13%inclusion946 decks7.07K decks
12%synergy
Drannith Magistrate
13%inclusion899 decks7.07K decks
5%synergy
Overlord of the Mistmoors
12%inclusion854 decks7.07K decks
10%synergy
Archetype of Imagination
12%inclusion848 decks7.07K decks
7%synergy
Mockingbird
11%inclusion812 decks7.07K decks
7%synergy
Voice of Victory
11%inclusion454 decks3.97K decks
3%synergy
Sage of Mysteries
11%inclusion803 decks7.07K decks
11%synergy
Hedron Crab
11%inclusion801 decks7.07K decks
11%synergy
Ancient Cellarspawn
11%inclusion784 decks7.07K decks
8%synergy
Archivist of Oghma
11%inclusion783 decks7.07K decks
4%synergy
Alseid of Life's Bounty
11%inclusion780 decks7.07K decks
10%synergy
Talion, the Kindly Lord
11%inclusion760 decks7.07K decks
3%synergy
Balemurk Leech
10%inclusion722 decks7.07K decks
10%synergy
Skullsnap Nuisance
10%inclusion718 decks7.07K decks
10%synergy
Spirited Companion
10%inclusion677 decks7.07K decks
8%synergy
Auriok Salvagers
9.5%inclusion669 decks7.07K decks
9%synergy
Gremlin Tamer
9.1%inclusion640 decks7.07K decks
8%synergy
Phyrexian Metamorph
8.9%inclusion628 decks7.07K decks
0%synergy
Nashi, Searcher in the Dark
8.8%inclusion623 decks7.07K decks
8%synergy
Wan Shi Tong, Librarian
8.1%inclusion128 decks1.57K decks
3%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.52K decks7.07K decks
9%synergy
Swan Song
32%inclusion2.29K decks7.07K decks
13%synergy
Path to Exile
30%inclusion2.14K decks7.07K decks
-12%synergy
Counterspell
29%inclusion2.06K decks7.07K decks
-12%synergy
Silence
27%inclusion1.90K decks7.07K decks
17%synergy
Arcane Denial
26%inclusion1.85K decks7.07K decks
6%synergy
Cyclonic Rift
24%inclusion1.73K decks7.07K decks
1%synergy
Force of Negation
24%inclusion1.68K decks7.07K decks
12%synergy
Flusterstorm
23%inclusion1.65K decks7.07K decks
15%synergy
Tainted Pact
23%inclusion1.62K decks7.07K decks
16%synergy
Demonic Consultation
23%inclusion1.62K decks7.07K decks
15%synergy
Mindbreak Trap
21%inclusion1.50K decks7.07K decks
14%synergy
Intuition
21%inclusion1.45K decks7.07K decks
19%synergy
Pact of Negation
20%inclusion1.44K decks7.07K decks
13%synergy
Mystical Tutor
20%inclusion1.43K decks7.07K decks
9%synergy
Borne Upon a Wind
20%inclusion1.38K decks7.07K decks
15%synergy
Mental Misstep
19%inclusion1.38K decks7.07K decks
13%synergy
Mana Drain
18%inclusion1.27K decks7.07K decks
1%synergy
Cabal Ritual
17%inclusion1.23K decks7.07K decks
14%synergy
Void Rend
15%inclusion1.07K decks7.07K decks
-19%synergy
Sink into Stupor
15%inclusion1.07K decks7.07K decks
2%synergy
Thirst for Meaning
15%inclusion1.03K decks7.07K decks
13%synergy
Dovin's Veto
14%inclusion1.01K decks7.07K decks
-11%synergy
Otherworldly Gaze
13%inclusion905 decks7.07K decks
11%synergy
Inkshield
13%inclusion889 decks7.07K decks
3%synergy
Frantic Search
13%inclusion887 decks7.07K decks
-5%synergy
Chain of Vapor
11%inclusion797 decks7.07K decks
8%synergy
Brainstorm
10%inclusion714 decks7.07K decks
-7%synergy
Negate
10%inclusion713 decks7.07K decks
-6%synergy
Into the Flood Maw
10%inclusion707 decks7.07K decks
6%synergy
Gifts Ungiven
9.0%inclusion633 decks7.07K decks
7%synergy
Anguished Unmaking
8.3%inclusion588 decks7.07K decks
-17%synergy
Teferi's Protection
6.8%inclusion480 decks7.07K decks
-10%synergy
Fell the Profane
6.4%inclusion455 decks7.07K decks
-2%synergy
Ad Nauseam
5.9%inclusion416 decks7.07K decks
4%synergy
Utter End
5.8%inclusion413 decks7.07K decks
-1%synergy
Deadly Rollick
5.4%inclusion379 decks7.07K decks
-9%synergy
Retraction Helix
5.3%inclusion376 decks7.07K decks
5%synergy
Generous Gift
5.3%inclusion376 decks7.07K decks
-9%synergy
Brain Freeze
5.3%inclusion375 decks7.07K decks
5%synergy
Sorceries
Redress Fate
30%inclusion2.09K decks7.07K decks
24%synergy
Windfall
28%inclusion1.95K decks7.07K decks
14%synergy
Reanimate
26%inclusion1.86K decks7.07K decks
10%synergy
Toxic Deluge
21%inclusion1.50K decks7.07K decks
2%synergy
Imperial Seal
19%inclusion1.31K decks7.07K decks
11%synergy
Singularity Rupture
15%inclusion400 decks2.63K decks
13%synergy
Extinguish All Hope
15%inclusion1.03K decks7.07K decks
13%synergy
Dance of the Manse
14%inclusion1K decks7.07K decks
11%synergy
Time Wipe
11%inclusion805 decks7.07K decks
5%synergy
Damn
10%inclusion738 decks7.07K decks
-10%synergy
Demonic Counsel
10%inclusion706 decks7.07K decks
9%synergy
Idyllic Tutor
9.1%inclusion646 decks7.07K decks
5%synergy
Lively Dirge
9.0%inclusion637 decks7.07K decks
8%synergy
Supreme Verdict
8.8%inclusion625 decks7.07K decks
-6%synergy
Glimpse the Unthinkable
8.6%inclusion611 decks7.07K decks
8%synergy
Resurgent Belief
8.6%inclusion605 decks7.07K decks
6%synergy
Beseech the Mirror
8.5%inclusion600 decks7.07K decks
5%synergy
Unmarked Grave
8.3%inclusion588 decks7.07K decks
7%synergy
Ponder
7.7%inclusion547 decks7.07K decks
-1%synergy
Replenish
7.5%inclusion527 decks7.07K decks
6%synergy
Space-Time Anomaly
7.4%inclusion190 decks2.57K decks
6%synergy
Buried Alive
7.0%inclusion497 decks7.07K decks
3%synergy
Mnemonic Betrayal
6.8%inclusion484 decks7.07K decks
4%synergy
Farewell
5.3%inclusion376 decks7.07K decks
-8%synergy
Utility Artifacts
The One Ring
24%inclusion1.69K decks7.07K decks
11%synergy
Wishclaw Talisman
21%inclusion1.46K decks7.07K decks
13%synergy
Mesmeric Orb
15%inclusion1.08K decks7.07K decks
14%synergy
Cloud Key
10%inclusion676 decks7.07K decks
6%synergy
Lightning Greaves
8.1%inclusion572 decks7.07K decks
-14%synergy
Keys to the House
5.5%inclusion388 decks7.05K decks
5%synergy
Swiftfoot Boots
5.5%inclusion386 decks7.07K decks
-19%synergy
Enchantments
Dance of the Dead
39%inclusion2.79K decks7.07K decks
37%synergy
Secret Arcade // Dusty Parlor
37%inclusion2.60K decks7.07K decks
32%synergy
Amphibian Downpour
36%inclusion2.58K decks7.07K decks
32%synergy
Propaganda
34%inclusion2.42K decks7.07K decks
7%synergy
Sigil of the Empty Throne
33%inclusion2.35K decks7.07K decks
27%synergy
Grasp of Fate
30%inclusion2.14K decks7.07K decks
24%synergy
Seal of Cleansing
29%inclusion2.05K decks7.07K decks
28%synergy
Ghostly Prison
29%inclusion2.03K decks7.07K decks
7%synergy
Cemetery Tampering
28%inclusion2K decks7.07K decks
27%synergy
Monologue Tax
25%inclusion1.79K decks7.07K decks
19%synergy
Starfield of Nyx
25%inclusion1.77K decks7.07K decks
21%synergy
Necropotence
24%inclusion1.72K decks7.07K decks
18%synergy
Estrid's Invocation
23%inclusion1.64K decks7.07K decks
19%synergy
The Meathook Massacre
21%inclusion1.52K decks7.07K decks
18%synergy
Touch the Spirit Realm
21%inclusion1.50K decks7.07K decks
19%synergy
Cacophony Unleashed
21%inclusion1.48K decks7.07K decks
19%synergy
Shark Typhoon
21%inclusion1.45K decks7.07K decks
15%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.43K decks7.05K decks
20%synergy
Darksteel Mutation
20%inclusion1.43K decks7.07K decks
14%synergy
Tinybones Joins Up
20%inclusion1.38K decks7.07K decks
18%synergy
Stillness in Motion
18%inclusion693 decks3.86K decks
18%synergy
All That Glitters
17%inclusion1.19K decks7.07K decks
8%synergy
Static Prison
17%inclusion1.17K decks7.07K decks
16%synergy
Polluted Cistern // Dim Oubliette
16%inclusion1.16K decks7.06K decks
16%synergy
Extravagant Replication
16%inclusion1.15K decks7.07K decks
11%synergy
Timely Ward
16%inclusion1.15K decks7.07K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.13K decks7.07K decks
16%synergy
Copy Enchantment
16%inclusion1.12K decks7.07K decks
11%synergy
Seal of Removal
16%inclusion1.11K decks7.07K decks
15%synergy
Phyrexian Arena
16%inclusion1.11K decks7.07K decks
2%synergy
Ethereal Armor
15%inclusion1.09K decks7.07K decks
11%synergy
Black Market Connections
15%inclusion1.05K decks7.07K decks
0%synergy
Greater Auramancy
15%inclusion1.04K decks7.07K decks
10%synergy
Out of the Tombs
15%inclusion1.04K decks7.07K decks
14%synergy
Imprisoned in the Moon
15%inclusion1.03K decks7.07K decks
8%synergy
Bottomless Pool // Locker Room
14%inclusion965 decks7.07K decks
12%synergy
Hallowed Haunting
14%inclusion959 decks7.07K decks
11%synergy
Restricted Office // Lecture Hall
13%inclusion931 decks7.07K decks
11%synergy
Leyline of Anticipation
13%inclusion927 decks7.07K decks
9%synergy
The Eldest Reborn
13%inclusion923 decks7.07K decks
11%synergy
Mirror Room // Fractured Realm
13%inclusion904 decks7.07K decks
11%synergy
Cramped Vents // Access Maze
13%inclusion891 decks7.07K decks
10%synergy
Trouble in Pairs
12%inclusion882 decks7.07K decks
7%synergy
Court of Cunning
12%inclusion851 decks7.07K decks
11%synergy
Sheltered by Ghosts
11%inclusion800 decks7.07K decks
9%synergy
Copy Artifact
11%inclusion783 decks7.07K decks
10%synergy
Central Elevator // Promising Stairs
11%inclusion752 decks7.07K decks
10%synergy
Dazzling Theater // Prop Room
11%inclusion742 decks7.05K decks
9%synergy
One with the Multiverse
10%inclusion732 decks7.07K decks
6%synergy
Teval's Judgment
10%inclusion403 decks3.94K decks
9%synergy
Battles
Invasion of Theros
6.1%inclusion430 decks7.07K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
18%inclusion1.30K decks7.07K decks
10%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.39K decks7.07K decks
35%synergy
Otawara, Soaring City
33%inclusion2.36K decks7.07K decks
14%synergy
Bojuka Bog
32%inclusion2.24K decks7.07K decks
5%synergy
Urza's Saga
15%inclusion1.09K decks7.07K decks
4%synergy
Cephalid Coliseum
14%inclusion1.01K decks7.07K decks
11%synergy
Reliquary Tower
13%inclusion915 decks7.07K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion901 decks7.07K decks
6%synergy
Halimar Depths
10%inclusion718 decks7.07K decks
5%synergy
Urborg, Tomb of Yawgmoth
10%inclusion682 decks7.07K decks
-3%synergy
Emergence Zone
10%inclusion679 decks7.07K decks
8%synergy
Serra's Sanctum
9.1%inclusion640 decks7.07K decks
7%synergy
Minamo, School at Water's Edge
8.9%inclusion627 decks7.07K decks
5%synergy
Mana Artifacts
Sol Ring
91%inclusion6.41K decks7.07K decks
1%synergy
Arcane Signet
90%inclusion6.38K decks7.07K decks
2%synergy
Talisman of Dominance
58%inclusion4.11K decks7.07K decks
9%synergy
Talisman of Progress
50%inclusion3.56K decks7.07K decks
7%synergy
Talisman of Hierarchy
44%inclusion3.10K decks7.07K decks
0%synergy
Fellwar Stone
44%inclusion3.08K decks7.07K decks
10%synergy
Azorius Signet
34%inclusion2.37K decks7.07K decks
2%synergy
Orzhov Signet
32%inclusion2.26K decks7.07K decks
-1%synergy
Lotus Petal
27%inclusion1.88K decks7.07K decks
16%synergy
Dimir Signet
24%inclusion1.69K decks7.07K decks
-8%synergy
Chrome Mox
24%inclusion1.68K decks7.07K decks
14%synergy
Mox Diamond
20%inclusion1.41K decks7.07K decks
13%synergy
Mox Opal
19%inclusion1.37K decks7.07K decks
11%synergy
Lion's Eye Diamond
15%inclusion1.08K decks7.07K decks
13%synergy
Mind Stone
15%inclusion1.04K decks7.07K decks
2%synergy
Commander's Sphere
12%inclusion849 decks7.07K decks
-7%synergy
Mox Amber
11%inclusion755 decks7.07K decks
5%synergy
Grim Monolith
8.8%inclusion622 decks7.07K decks
5%synergy
Thought Vessel
6.4%inclusion452 decks7.07K decks
-18%synergy
Chromatic Lantern
5.9%inclusion419 decks7.07K decks
-7%synergy
Lands
Command Tower
94%inclusion6.62K decks7.07K decks
1%synergy
Island
85%inclusion6.02K decks7.07K decks
-8%synergy
Swamp
83%inclusion5.84K decks7.07K decks
-9%synergy
Plains
81%inclusion5.73K decks7.07K decks
-11%synergy
Godless Shrine
59%inclusion4.14K decks7.07K decks
8%synergy
Watery Grave
59%inclusion4.14K decks7.07K decks
8%synergy
Hallowed Fountain
58%inclusion4.12K decks7.07K decks
8%synergy
Exotic Orchard
55%inclusion3.92K decks7.07K decks
-3%synergy
Flooded Strand
52%inclusion3.69K decks7.07K decks
14%synergy
Polluted Delta
52%inclusion3.67K decks7.07K decks
14%synergy
Marsh Flats
49%inclusion3.46K decks7.07K decks
13%synergy
Arcane Sanctum
46%inclusion3.26K decks7.07K decks
-8%synergy
Caves of Koilos
45%inclusion3.15K decks7.07K decks
9%synergy
Adarkar Wastes
44%inclusion3.09K decks7.07K decks
12%synergy
Underground River
42%inclusion2.94K decks7.07K decks
8%synergy
Morphic Pool
40%inclusion2.85K decks7.07K decks
6%synergy
Sea of Clouds
40%inclusion2.79K decks7.07K decks
4%synergy
Vault of Champions
37%inclusion2.59K decks7.07K decks
4%synergy
Undercity Sewers
35%inclusion2.46K decks7.07K decks
20%synergy
Raffine's Tower
34%inclusion2.41K decks7.07K decks
-7%synergy
Glacial Fortress
29%inclusion2.08K decks7.07K decks
-12%synergy
City of Brass
28%inclusion1.99K decks7.07K decks
13%synergy
Isolated Chapel
28%inclusion1.98K decks7.07K decks
-12%synergy
Meticulous Archive
28%inclusion1.96K decks7.07K decks
14%synergy
Scrubland
27%inclusion1.93K decks7.07K decks
11%synergy
Tundra
27%inclusion1.93K decks7.07K decks
11%synergy
Underground Sea
27%inclusion1.90K decks7.07K decks
11%synergy
Mana Confluence
26%inclusion1.85K decks7.07K decks
12%synergy
Shadowy Backstreet
26%inclusion1.83K decks7.07K decks
13%synergy
Bloodstained Mire
26%inclusion1.81K decks7.07K decks
15%synergy
Misty Rainforest
25%inclusion1.79K decks7.07K decks
14%synergy
Drowned Catacomb
24%inclusion1.72K decks7.07K decks
-12%synergy
Verdant Catacombs
24%inclusion1.67K decks7.07K decks
14%synergy
Prairie Stream
23%inclusion1.64K decks7.07K decks
-18%synergy
Scalding Tarn
23%inclusion1.62K decks7.07K decks
12%synergy
Valgavoth's Lair
22%inclusion1.59K decks7.07K decks
20%synergy
Evolving Wilds
22%inclusion1.56K decks7.07K decks
-3%synergy
Windswept Heath
22%inclusion1.56K decks7.07K decks
12%synergy
Gemstone Caverns
22%inclusion1.55K decks7.07K decks
14%synergy
Sunken Hollow
22%inclusion1.54K decks7.07K decks
-18%synergy
Terramorphic Expanse
21%inclusion1.50K decks7.07K decks
5%synergy
Temple of Enlightenment
21%inclusion1.48K decks7.07K decks
5%synergy
Temple of Silence
21%inclusion1.46K decks7.07K decks
1%synergy
Arid Mesa
20%inclusion1.42K decks7.07K decks
10%synergy
Temple of Deceit
20%inclusion1.40K decks7.07K decks
2%synergy
Obscura Storefront
19%inclusion1.37K decks7.07K decks
9%synergy
Tainted Field
18%inclusion1.31K decks7.07K decks
12%synergy
Tainted Isle
18%inclusion1.28K decks7.07K decks
12%synergy
Azorius Chancery
18%inclusion1.27K decks7.07K decks
4%synergy
Dimir Aqueduct
17%inclusion1.23K decks7.07K decks
4%synergy