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
Wan Shi Tong, Librarian
7.4%inclusion45 decks607 decks
3%synergy
Chakra Meditation
1.2%inclusion6 decks486 decks
1%synergy
The Legend of Kuruk
1.2%inclusion7 decks590 decks
1%synergy
The Legend of Yangchen
0.9%inclusion5 decks561 decks
1%synergy
Honest Work
0.8%inclusion5 decks607 decks
1%synergy
High Synergy Cards
Animate Dead
69%inclusion4.41K decks6.42K decks
59%synergy
Ripples of Undeath
61%inclusion3.89K decks6.42K decks
58%synergy
Dress Down
58%inclusion3.74K decks6.42K decks
56%synergy
Necromancy
57%inclusion3.65K decks6.42K decks
52%synergy
Inquisitive Glimmer
56%inclusion3.59K decks6.42K decks
48%synergy
Mesa Enchantress
52%inclusion3.33K decks6.42K decks
43%synergy
Starfield Mystic
48%inclusion3.11K decks6.42K decks
42%synergy
Entity Tracker
48%inclusion3.09K decks6.42K decks
42%synergy
Gravebreaker Lamia
41%inclusion2.66K decks6.42K decks
40%synergy
Mystic Remora
61%inclusion3.90K decks6.42K decks
39%synergy
Top Cards
Swords to Plowshares
62%inclusion4.01K decks6.42K decks
-6%synergy
Sevinne's Reclamation
47%inclusion3.05K decks6.42K decks
39%synergy
Mirrormade
45%inclusion2.89K decks6.42K decks
35%synergy
Entomb
45%inclusion2.87K decks6.42K decks
38%synergy
Demon of Fate's Design
44%inclusion2.85K decks6.42K decks
39%synergy
Blind Obedience
42%inclusion2.71K decks6.42K decks
30%synergy
Fear of Sleep Paralysis
41%inclusion2.65K decks6.42K decks
36%synergy
Dark Ritual
41%inclusion2.64K decks6.42K decks
22%synergy
Doomwake Giant
40%inclusion2.60K decks6.42K decks
34%synergy
Dance of the Dead
40%inclusion2.57K decks6.42K decks
38%synergy
Game Changers
Smothering Tithe
53%inclusion3.39K decks6.42K decks
20%synergy
Rhystic Study
50%inclusion3.24K decks6.42K decks
18%synergy
Enlightened Tutor
40%inclusion2.54K decks6.42K decks
19%synergy
Demonic Tutor
34%inclusion2.16K decks6.42K decks
12%synergy
Thassa's Oracle
31%inclusion2.02K decks6.42K decks
21%synergy
Vampiric Tutor
31%inclusion2K decks6.42K decks
13%synergy
Ancient Tomb
28%inclusion1.78K decks6.42K decks
14%synergy
Force of Will
27%inclusion1.74K decks6.42K decks
14%synergy
Fierce Guardianship
27%inclusion1.74K decks6.42K decks
6%synergy
Mana Vault
27%inclusion1.73K decks6.42K decks
17%synergy
Creatures
Scrabbling Skullcrab
38%inclusion2.46K decks6.42K decks
37%synergy
Abdel Adrian, Gorion's Ward
36%inclusion2.34K decks6.42K decks
35%synergy
Ondu Spiritdancer
36%inclusion2.33K decks6.42K decks
30%synergy
Esper Sentinel
35%inclusion2.25K decks6.42K decks
7%synergy
Overlord of the Floodpits
34%inclusion2.18K decks6.42K decks
30%synergy
Overlord of the Balemurk
34%inclusion2.15K decks6.42K decks
31%synergy
Victor, Valgavoth's Seneschal
32%inclusion2.04K decks6.42K decks
30%synergy
Grand Abolisher
30%inclusion1.90K decks6.42K decks
15%synergy
Fear of Impostors
29%inclusion1.85K decks6.42K decks
27%synergy
Lotho, Corrupt Shirriff
28%inclusion1.80K decks6.42K decks
11%synergy
Zur, Eternal Schemer
28%inclusion1.79K decks6.42K decks
25%synergy
Orcish Bowmasters
25%inclusion1.59K decks6.42K decks
14%synergy
Valley Floodcaller
25%inclusion1.58K decks6.42K decks
20%synergy
Ghostly Dancers
24%inclusion1.53K decks6.42K decks
21%synergy
Hullbreaker Horror
22%inclusion1.44K decks6.42K decks
16%synergy
Soaring Lightbringer
22%inclusion1.42K decks6.42K decks
17%synergy
Zur the Enchanter
22%inclusion1.42K decks6.42K decks
17%synergy
Silent Hallcreeper
21%inclusion1.37K decks6.42K decks
17%synergy
Ranger-Captain of Eos
21%inclusion1.36K decks6.42K decks
15%synergy
Enduring Curiosity
21%inclusion1.34K decks6.42K decks
13%synergy
Displacer Kitten
20%inclusion1.29K decks6.42K decks
13%synergy
Heliod, the Radiant Dawn
20%inclusion1.28K decks6.42K decks
16%synergy
Moon-Blessed Cleric
20%inclusion1.28K decks6.42K decks
15%synergy
Grim Guardian
19%inclusion1.22K decks6.42K decks
16%synergy
Aminatou, Veil Piercer
18%inclusion1.17K decks6.42K decks
17%synergy
Archon of Sun's Grace
17%inclusion1.11K decks6.42K decks
12%synergy
Opposition Agent
17%inclusion1.08K decks6.42K decks
8%synergy
Ledger Shredder
14%inclusion902 decks6.42K decks
5%synergy
Lurrus of the Dream-Den
14%inclusion891 decks6.42K decks
12%synergy
Mindwrack Harpy
14%inclusion874 decks6.42K decks
13%synergy
Drannith Magistrate
14%inclusion872 decks6.42K decks
5%synergy
Athreos, Shroud-Veiled
13%inclusion862 decks6.42K decks
9%synergy
Overlord of the Mistmoors
12%inclusion769 decks6.42K decks
10%synergy
Archetype of Imagination
12%inclusion767 decks6.42K decks
7%synergy
Mockingbird
12%inclusion760 decks6.42K decks
7%synergy
Voice of Victory
12%inclusion373 decks3.17K decks
4%synergy
Archivist of Oghma
12%inclusion754 decks6.42K decks
5%synergy
Talion, the Kindly Lord
12%inclusion754 decks6.42K decks
4%synergy
Alseid of Life's Bounty
11%inclusion721 decks6.42K decks
10%synergy
Ancient Cellarspawn
11%inclusion721 decks6.42K decks
8%synergy
Sage of Mysteries
11%inclusion702 decks6.42K decks
11%synergy
Hedron Crab
11%inclusion686 decks6.42K decks
10%synergy
Balemurk Leech
10%inclusion654 decks6.42K decks
9%synergy
Auriok Salvagers
10%inclusion641 decks6.42K decks
10%synergy
Skullsnap Nuisance
10%inclusion632 decks6.42K decks
9%synergy
Spirited Companion
10%inclusion622 decks6.42K decks
8%synergy
Phyrexian Metamorph
10%inclusion621 decks6.42K decks
1%synergy
Gremlin Tamer
9.0%inclusion581 decks6.42K decks
8%synergy
Nashi, Searcher in the Dark
8.9%inclusion570 decks6.42K decks
8%synergy
Pollywog Prodigy
8.1%inclusion518 decks6.42K decks
4%synergy
Instants
An Offer You Can't Refuse
36%inclusion2.33K decks6.42K decks
10%synergy
Swan Song
33%inclusion2.12K decks6.42K decks
14%synergy
Path to Exile
30%inclusion1.94K decks6.42K decks
-12%synergy
Counterspell
29%inclusion1.84K decks6.42K decks
-13%synergy
Silence
28%inclusion1.78K decks6.42K decks
17%synergy
Arcane Denial
26%inclusion1.68K decks6.42K decks
6%synergy
Cyclonic Rift
26%inclusion1.64K decks6.42K decks
1%synergy
Force of Negation
25%inclusion1.60K decks6.42K decks
13%synergy
Flusterstorm
24%inclusion1.56K decks6.42K decks
16%synergy
Tainted Pact
24%inclusion1.54K decks6.42K decks
16%synergy
Demonic Consultation
24%inclusion1.54K decks6.42K decks
15%synergy
Mindbreak Trap
22%inclusion1.44K decks6.42K decks
15%synergy
Intuition
22%inclusion1.39K decks6.42K decks
20%synergy
Pact of Negation
21%inclusion1.36K decks6.42K decks
13%synergy
Mystical Tutor
21%inclusion1.35K decks6.42K decks
9%synergy
Borne Upon a Wind
20%inclusion1.31K decks6.42K decks
16%synergy
Mental Misstep
20%inclusion1.30K decks6.42K decks
13%synergy
Mana Drain
19%inclusion1.20K decks6.42K decks
1%synergy
Cabal Ritual
18%inclusion1.14K decks6.42K decks
14%synergy
Sink into Stupor
15%inclusion988 decks6.42K decks
3%synergy
Void Rend
15%inclusion944 decks6.42K decks
-18%synergy
Thirst for Meaning
14%inclusion926 decks6.42K decks
13%synergy
Dovin's Veto
14%inclusion911 decks6.42K decks
-10%synergy
Otherworldly Gaze
13%inclusion830 decks6.42K decks
11%synergy
Inkshield
12%inclusion799 decks6.42K decks
3%synergy
Frantic Search
12%inclusion784 decks6.42K decks
-5%synergy
Chain of Vapor
12%inclusion765 decks6.42K decks
8%synergy
Brainstorm
10%inclusion666 decks6.42K decks
-7%synergy
Into the Flood Maw
10%inclusion655 decks6.42K decks
6%synergy
Negate
10%inclusion645 decks6.42K decks
-7%synergy
Anguished Unmaking
8.4%inclusion538 decks6.42K decks
-16%synergy
Gifts Ungiven
8.3%inclusion532 decks6.42K decks
6%synergy
Teferi's Protection
7.0%inclusion450 decks6.42K decks
-10%synergy
Fell the Profane
6.4%inclusion408 decks6.42K decks
-2%synergy
Ad Nauseam
6.0%inclusion385 decks6.42K decks
3%synergy
Utter End
5.6%inclusion361 decks6.42K decks
-1%synergy
Generous Gift
5.6%inclusion360 decks6.42K decks
-9%synergy
Brain Freeze
5.5%inclusion353 decks6.42K decks
5%synergy
Retraction Helix
5.5%inclusion351 decks6.42K decks
5%synergy
Deadly Rollick
5.5%inclusion350 decks6.42K decks
-8%synergy
Dispel
5.1%inclusion325 decks6.42K decks
1%synergy
Strix Serenade
5.0%inclusion324 decks6.42K decks
1%synergy
Sorceries
Redress Fate
29%inclusion1.88K decks6.42K decks
23%synergy
Windfall
28%inclusion1.80K decks6.42K decks
14%synergy
Reanimate
26%inclusion1.69K decks6.42K decks
11%synergy
Toxic Deluge
22%inclusion1.42K decks6.42K decks
3%synergy
Imperial Seal
20%inclusion1.25K decks6.42K decks
12%synergy
Singularity Rupture
15%inclusion263 decks1.78K decks
12%synergy
Extinguish All Hope
14%inclusion915 decks6.42K decks
13%synergy
Dance of the Manse
14%inclusion901 decks6.42K decks
10%synergy
Time Wipe
12%inclusion748 decks6.42K decks
4%synergy
Damn
11%inclusion695 decks6.42K decks
-10%synergy
Demonic Counsel
11%inclusion676 decks6.42K decks
9%synergy
Idyllic Tutor
9.2%inclusion588 decks6.42K decks
5%synergy
Lively Dirge
9.0%inclusion577 decks6.42K decks
8%synergy
Supreme Verdict
9.0%inclusion575 decks6.42K decks
-6%synergy
Beseech the Mirror
8.7%inclusion558 decks6.42K decks
5%synergy
Resurgent Belief
8.5%inclusion548 decks6.42K decks
6%synergy
Unmarked Grave
8.5%inclusion546 decks6.42K decks
7%synergy
Glimpse the Unthinkable
8.1%inclusion519 decks6.42K decks
8%synergy
Ponder
7.8%inclusion503 decks6.42K decks
-1%synergy
Space-Time Anomaly
7.7%inclusion133 decks1.72K decks
6%synergy
Replenish
7.4%inclusion477 decks6.42K decks
6%synergy
Buried Alive
7.2%inclusion462 decks6.42K decks
3%synergy
Mnemonic Betrayal
7.0%inclusion450 decks6.42K decks
4%synergy
Farewell
5.5%inclusion351 decks6.42K decks
-7%synergy
Utility Artifacts
The One Ring
25%inclusion1.63K decks6.42K decks
12%synergy
Wishclaw Talisman
22%inclusion1.38K decks6.42K decks
13%synergy
Mesmeric Orb
15%inclusion979 decks6.42K decks
14%synergy
Cloud Key
9.3%inclusion594 decks6.42K decks
6%synergy
Lightning Greaves
8.3%inclusion531 decks6.42K decks
-14%synergy
Swiftfoot Boots
5.5%inclusion355 decks6.42K decks
-18%synergy
Keys to the House
5.3%inclusion338 decks6.40K decks
5%synergy
Enchantments
Sphere of Safety
39%inclusion2.51K decks6.42K decks
30%synergy
Secret Arcade // Dusty Parlor
36%inclusion2.34K decks6.42K decks
31%synergy
Amphibian Downpour
35%inclusion2.27K decks6.42K decks
31%synergy
Propaganda
34%inclusion2.18K decks6.42K decks
8%synergy
Sigil of the Empty Throne
33%inclusion2.13K decks6.42K decks
27%synergy
Grasp of Fate
30%inclusion1.90K decks6.42K decks
23%synergy
Ghostly Prison
29%inclusion1.83K decks6.42K decks
7%synergy
Seal of Cleansing
28%inclusion1.82K decks6.42K decks
27%synergy
Cemetery Tampering
28%inclusion1.79K decks6.42K decks
27%synergy
Necropotence
25%inclusion1.61K decks6.42K decks
18%synergy
Monologue Tax
25%inclusion1.60K decks6.42K decks
19%synergy
Starfield of Nyx
25%inclusion1.59K decks6.42K decks
21%synergy
Estrid's Invocation
23%inclusion1.45K decks6.42K decks
18%synergy
Touch the Spirit Realm
22%inclusion1.42K decks6.42K decks
19%synergy
The Meathook Massacre
21%inclusion1.37K decks6.42K decks
18%synergy
Shark Typhoon
21%inclusion1.34K decks6.42K decks
15%synergy
Cacophony Unleashed
21%inclusion1.33K decks6.42K decks
19%synergy
Defiled Crypt // Cadaver Lab
20%inclusion1.30K decks6.40K decks
19%synergy
Darksteel Mutation
20%inclusion1.30K decks6.42K decks
14%synergy
Tinybones Joins Up
20%inclusion1.28K decks6.42K decks
19%synergy
Stillness in Motion
17%inclusion529 decks3.06K decks
17%synergy
Static Prison
17%inclusion1.09K decks6.42K decks
16%synergy
All That Glitters
17%inclusion1.08K decks6.42K decks
8%synergy
Polluted Cistern // Dim Oubliette
17%inclusion1.06K decks6.41K decks
16%synergy
Extravagant Replication
16%inclusion1.03K decks6.42K decks
11%synergy
Timely Ward
16%inclusion1.03K decks6.42K decks
11%synergy
The Tale of Tamiyo
16%inclusion1.02K decks6.42K decks
15%synergy
Copy Enchantment
16%inclusion1.01K decks6.42K decks
11%synergy
Phyrexian Arena
16%inclusion1K decks6.42K decks
2%synergy
Seal of Removal
15%inclusion986 decks6.42K decks
15%synergy
Ethereal Armor
15%inclusion957 decks6.42K decks
10%synergy
Out of the Tombs
15%inclusion951 decks6.42K decks
14%synergy
Black Market Connections
15%inclusion945 decks6.42K decks
1%synergy
Greater Auramancy
15%inclusion940 decks6.42K decks
10%synergy
Imprisoned in the Moon
14%inclusion891 decks6.42K decks
7%synergy
Hallowed Haunting
14%inclusion867 decks6.42K decks
11%synergy
Leyline of Anticipation
13%inclusion845 decks6.42K decks
9%synergy
Bottomless Pool // Locker Room
13%inclusion840 decks6.42K decks
11%synergy
Trouble in Pairs
13%inclusion836 decks6.42K decks
7%synergy
The Eldest Reborn
13%inclusion828 decks6.42K decks
10%synergy
Restricted Office // Lecture Hall
13%inclusion804 decks6.42K decks
10%synergy
Mirror Room // Fractured Realm
12%inclusion802 decks6.42K decks
10%synergy
Cramped Vents // Access Maze
12%inclusion801 decks6.42K decks
10%synergy
Court of Cunning
12%inclusion767 decks6.42K decks
11%synergy
Copy Artifact
12%inclusion742 decks6.42K decks
10%synergy
Sheltered by Ghosts
11%inclusion710 decks6.42K decks
8%synergy
Dazzling Theater // Prop Room
10%inclusion665 decks6.40K decks
9%synergy
Teval's Judgment
10%inclusion324 decks3.14K decks
9%synergy
One with the Multiverse
10%inclusion658 decks6.42K decks
5%synergy
Central Elevator // Promising Stairs
10%inclusion653 decks6.42K decks
9%synergy
Battles
Invasion of Theros
6.2%inclusion399 decks6.42K decks
4%synergy
Planeswalkers
Teferi, Time Raveler
19%inclusion1.25K decks6.42K decks
11%synergy
Utility Lands
Hall of Heliod's Generosity
48%inclusion3.07K decks6.42K decks
35%synergy
Otawara, Soaring City
34%inclusion2.19K decks6.42K decks
15%synergy
Bojuka Bog
31%inclusion2K decks6.42K decks
4%synergy
Urza's Saga
16%inclusion1.01K decks6.42K decks
4%synergy
Cephalid Coliseum
14%inclusion912 decks6.42K decks
11%synergy
Reliquary Tower
13%inclusion817 decks6.42K decks
-21%synergy
Takenuma, Abandoned Mire
13%inclusion805 decks6.42K decks
6%synergy
Emergence Zone
10%inclusion642 decks6.42K decks
8%synergy
Halimar Depths
10%inclusion641 decks6.42K decks
5%synergy
Urborg, Tomb of Yawgmoth
10%inclusion627 decks6.42K decks
-4%synergy
Minamo, School at Water's Edge
10%inclusion610 decks6.42K decks
5%synergy
Serra's Sanctum
9.4%inclusion602 decks6.42K decks
8%synergy
Mana Artifacts
Sol Ring
91%inclusion5.84K decks6.42K decks
1%synergy
Arcane Signet
91%inclusion5.82K decks6.42K decks
3%synergy
Talisman of Dominance
59%inclusion3.81K decks6.42K decks
10%synergy
Talisman of Progress
51%inclusion3.28K decks6.42K decks
9%synergy
Fellwar Stone
44%inclusion2.85K decks6.42K decks
10%synergy
Talisman of Hierarchy
44%inclusion2.84K decks6.42K decks
1%synergy
Azorius Signet
34%inclusion2.17K decks6.42K decks
1%synergy
Orzhov Signet
32%inclusion2.08K decks6.42K decks
-3%synergy
Lotus Petal
28%inclusion1.77K decks6.42K decks
17%synergy
Chrome Mox
25%inclusion1.59K decks6.42K decks
15%synergy
Dimir Signet
24%inclusion1.55K decks6.42K decks
-9%synergy
Mox Diamond
21%inclusion1.34K decks6.42K decks
13%synergy
Mox Opal
20%inclusion1.30K decks6.42K decks
11%synergy
Lion's Eye Diamond
16%inclusion1.01K decks6.42K decks
14%synergy
Mind Stone
15%inclusion972 decks6.42K decks
2%synergy
Commander's Sphere
12%inclusion770 decks6.42K decks
-8%synergy
Mox Amber
11%inclusion710 decks6.42K decks
5%synergy
Grim Monolith
9.1%inclusion586 decks6.42K decks
5%synergy
Thought Vessel
6.6%inclusion421 decks6.42K decks
-18%synergy
Chromatic Lantern
6.0%inclusion386 decks6.42K decks
-8%synergy
Lands
Command Tower
94%inclusion6.02K decks6.42K decks
1%synergy
Island
85%inclusion5.45K decks6.42K decks
-8%synergy
Swamp
82%inclusion5.27K decks6.42K decks
-9%synergy
Plains
80%inclusion5.16K decks6.42K decks
-11%synergy
Godless Shrine
58%inclusion3.74K decks6.42K decks
8%synergy
Watery Grave
58%inclusion3.73K decks6.42K decks
9%synergy
Hallowed Fountain
58%inclusion3.71K decks6.42K decks
9%synergy
Exotic Orchard
55%inclusion3.56K decks6.42K decks
-3%synergy
Flooded Strand
53%inclusion3.41K decks6.42K decks
15%synergy
Polluted Delta
52%inclusion3.37K decks6.42K decks
15%synergy
Marsh Flats
50%inclusion3.19K decks6.42K decks
14%synergy
Arcane Sanctum
46%inclusion2.93K decks6.42K decks
-9%synergy
Caves of Koilos
44%inclusion2.83K decks6.42K decks
9%synergy
Adarkar Wastes
43%inclusion2.77K decks6.42K decks
13%synergy
Underground River
41%inclusion2.65K decks6.42K decks
9%synergy
Morphic Pool
41%inclusion2.61K decks6.42K decks
6%synergy
Sea of Clouds
40%inclusion2.56K decks6.42K decks
4%synergy
Vault of Champions
37%inclusion2.36K decks6.42K decks
4%synergy
Undercity Sewers
35%inclusion2.23K decks6.42K decks
21%synergy
Raffine's Tower
34%inclusion2.17K decks6.42K decks
-7%synergy
City of Brass
29%inclusion1.86K decks6.42K decks
14%synergy
Glacial Fortress
28%inclusion1.82K decks6.42K decks
-11%synergy
Tundra
28%inclusion1.79K decks6.42K decks
12%synergy
Scrubland
28%inclusion1.78K decks6.42K decks
12%synergy
Meticulous Archive
28%inclusion1.78K decks6.42K decks
14%synergy
Isolated Chapel
27%inclusion1.76K decks6.42K decks
-10%synergy
Underground Sea
27%inclusion1.75K decks6.42K decks
11%synergy
Mana Confluence
27%inclusion1.74K decks6.42K decks
13%synergy
Bloodstained Mire
27%inclusion1.71K decks6.42K decks
15%synergy
Misty Rainforest
26%inclusion1.69K decks6.42K decks
15%synergy
Shadowy Backstreet
26%inclusion1.65K decks6.42K decks
13%synergy
Verdant Catacombs
24%inclusion1.57K decks6.42K decks
14%synergy
Scalding Tarn
24%inclusion1.52K decks6.42K decks
12%synergy
Drowned Catacomb
24%inclusion1.52K decks6.42K decks
-11%synergy
Windswept Heath
23%inclusion1.48K decks6.42K decks
13%synergy
Gemstone Caverns
23%inclusion1.47K decks6.42K decks
15%synergy
Prairie Stream
23%inclusion1.46K decks6.42K decks
-18%synergy
Valgavoth's Lair
23%inclusion1.46K decks6.42K decks
20%synergy
Evolving Wilds
22%inclusion1.42K decks6.42K decks
-3%synergy
Terramorphic Expanse
21%inclusion1.38K decks6.42K decks
4%synergy
Temple of Enlightenment
21%inclusion1.36K decks6.42K decks
4%synergy
Sunken Hollow
21%inclusion1.36K decks6.42K decks
-18%synergy
Temple of Silence
21%inclusion1.35K decks6.42K decks
1%synergy
Arid Mesa
21%inclusion1.33K decks6.42K decks
11%synergy
Temple of Deceit
20%inclusion1.31K decks6.42K decks
2%synergy
Obscura Storefront
20%inclusion1.26K decks6.42K decks
9%synergy
Tainted Field
18%inclusion1.19K decks6.42K decks
11%synergy
Azorius Chancery
18%inclusion1.17K decks6.42K decks
3%synergy
Tainted Isle
18%inclusion1.15K decks6.42K decks
12%synergy
Dimir Aqueduct
18%inclusion1.14K decks6.42K decks
4%synergy