Koma, Cosmos Serpent (Commander) - Sea Creatures

Alternate Names:

The Monstrous SerpentThe Monstrous Serpent

Koma, Cosmos Serpent
Rank #298
146decks
As CommanderAs CardAverage DeckDecks
Bracket
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Budget
Any$$$$
Background image for How To Play Sea Creatures Differently In Commander
Sikora
Nov 13, 2025
Sikora
How To Play Sea Creatures Differently In Commander
Sea creatures in Magic are basically as old as the game itself, but they've changed significantly in that time.
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The Unagi of Kyoshi Island
21%inclusion3 decks14 decks
17%synergy
Ember Island Production
7.1%inclusion1 decks14 decks
6%synergy
Shared Roots
7.1%inclusion1 decks14 decks
4%synergy
Agna Qel'a
7.1%inclusion1 decks14 decks
6%synergy
Bender's Waterskin
4.0%inclusion1 decks25 decks
3%synergy
High Synergy Cards
Serpent of Yawning Depths
86%inclusion126 decks146 decks
80%synergy
Whelming Wave
88%inclusion129 decks146 decks
77%synergy
Spawning Kraken
74%inclusion108 decks146 decks
67%synergy
Slinn Voda, the Rising Deep
71%inclusion103 decks146 decks
64%synergy
Junk Winder
68%inclusion99 decks146 decks
61%synergy
Koma, World-Eater
73%inclusion48 decks66 decks
59%synergy
Aesi, Tyrant of Gyre Strait
76%inclusion111 decks146 decks
59%synergy
Arixmethes, Slumbering Isle
72%inclusion105 decks146 decks
58%synergy
Adrix and Nev, Twincasters
60%inclusion88 decks146 decks
52%synergy
Nadir Kraken
52%inclusion76 decks146 decks
48%synergy
Top Cards
Cultivate
82%inclusion120 decks146 decks
35%synergy
Rampant Growth
77%inclusion112 decks146 decks
36%synergy
Kodama's Reach
75%inclusion110 decks146 decks
39%synergy
Counterspell
72%inclusion105 decks146 decks
22%synergy
Growth Spiral
68%inclusion99 decks146 decks
23%synergy
Hullbreaker Horror
62%inclusion91 decks146 decks
45%synergy
Beast Within
55%inclusion81 decks146 decks
5%synergy
Scourge of Fleets
54%inclusion79 decks146 decks
46%synergy
Stormtide Leviathan
53%inclusion77 decks146 decks
47%synergy
Farseek
51%inclusion74 decks146 decks
26%synergy
Game Changers
Cyclonic Rift
38%inclusion56 decks146 decks
12%synergy
Rhystic Study
29%inclusion42 decks146 decks
7%synergy
Fierce Guardianship
21%inclusion31 decks146 decks
4%synergy
Worldly Tutor
12%inclusion18 decks146 decks
-3%synergy
Seedborn Muse
12%inclusion17 decks146 decks
-4%synergy
Ancient Tomb
8.2%inclusion12 decks146 decks
-1%synergy
Mystical Tutor
7.5%inclusion11 decks146 decks
-2%synergy
Consecrated Sphinx
6.8%inclusion10 decks146 decks
-2%synergy
Creatures
Xolatoyac, the Smiling Flood
50%inclusion73 decks146 decks
43%synergy
Tromokratis
49%inclusion72 decks146 decks
44%synergy
Kiora, Sovereign of the Deep
46%inclusion67 decks146 decks
44%synergy
Inkwell Leviathan
45%inclusion66 decks146 decks
41%synergy
Stormsurge Kraken
45%inclusion65 decks146 decks
40%synergy
Nezahal, Primal Tide
40%inclusion58 decks146 decks
29%synergy
Deep-Sea Kraken
39%inclusion57 decks146 decks
36%synergy
Shipbreaker Kraken
38%inclusion56 decks146 decks
35%synergy
Summon: Leviathan
38%inclusion11 decks29 decks
31%synergy
Sword Coast Serpent
38%inclusion55 decks146 decks
36%synergy
Brinelin, the Moon Kraken
37%inclusion54 decks146 decks
33%synergy
Simic Sky Swallower
37%inclusion54 decks146 decks
33%synergy
Birds of Paradise
36%inclusion53 decks146 decks
9%synergy
Reservoir Kraken
32%inclusion47 decks146 decks
31%synergy
Trench Behemoth
32%inclusion47 decks146 decks
29%synergy
Reef Worm
32%inclusion46 decks146 decks
28%synergy
Spark Double
31%inclusion45 decks146 decks
21%synergy
Monstrosity of the Lake
30%inclusion44 decks146 decks
28%synergy
Murkfiend Liege
29%inclusion42 decks146 decks
14%synergy
Breaching Leviathan
29%inclusion42 decks146 decks
27%synergy
Lorthos, the Tidemaker
29%inclusion42 decks146 decks
25%synergy
Charix, the Raging Isle
28%inclusion41 decks146 decks
25%synergy
Tatyova, Benthic Druid
27%inclusion40 decks146 decks
-4%synergy
The Watcher in the Water
27%inclusion40 decks146 decks
26%synergy
Sakura-Tribe Elder
27%inclusion39 decks146 decks
7%synergy
Cryptic Serpent
26%inclusion38 decks146 decks
26%synergy
Llanowar Elves
24%inclusion35 decks146 decks
-4%synergy
Benthic Anomaly
23%inclusion25 decks108 decks
21%synergy
Sakashima of a Thousand Faces
23%inclusion33 decks146 decks
18%synergy
Scrapdiver Serpent
22%inclusion32 decks146 decks
22%synergy
Octomancer
21%inclusion20 decks97 decks
16%synergy
Chameleon, Master of Disguise
20%inclusion5 decks25 decks
18%synergy
Sakashima the Impostor
20%inclusion29 decks146 decks
17%synergy
Mesmerizing Benthid
20%inclusion29 decks146 decks
19%synergy
Starwinder
19%inclusion5 decks27 decks
12%synergy
Elvish Mystic
18%inclusion27 decks146 decks
-6%synergy
Harbor Serpent
18%inclusion27 decks146 decks
18%synergy
Verazol, the Split Current
18%inclusion26 decks146 decks
18%synergy
Tolarian Kraken
17%inclusion25 decks146 decks
16%synergy
Enduring Vitality
17%inclusion15 decks89 decks
9%synergy
Esix, Fractal Bloom
16%inclusion24 decks146 decks
13%synergy
Coiling Oracle
16%inclusion23 decks146 decks
2%synergy
Archetype of Imagination
16%inclusion23 decks146 decks
11%synergy
Tolarian Terror
16%inclusion23 decks146 decks
15%synergy
Sea-Dasher Octopus
15%inclusion22 decks146 decks
12%synergy
Craterhoof Behemoth
15%inclusion22 decks146 decks
6%synergy
Nimbus Swimmer
15%inclusion22 decks146 decks
14%synergy
Garruk's Packleader
14%inclusion21 decks146 decks
12%synergy
Elder Deep-Fiend
14%inclusion21 decks146 decks
13%synergy
Biolume Egg
14%inclusion21 decks146 decks
14%synergy
Instants
Negate
42%inclusion62 decks146 decks
16%synergy
Return of the Wildspeaker
36%inclusion53 decks146 decks
26%synergy
Simic Charm
36%inclusion52 decks146 decks
28%synergy
Double Major
33%inclusion48 decks146 decks
24%synergy
Heroic Intervention
31%inclusion45 decks146 decks
1%synergy
Krosan Grip
27%inclusion39 decks146 decks
19%synergy
Arcane Denial
27%inclusion39 decks146 decks
4%synergy
Engulf the Shore
25%inclusion36 decks146 decks
23%synergy
Mana Drain
23%inclusion34 decks146 decks
8%synergy
Second Harvest
23%inclusion33 decks146 decks
16%synergy
Planar Genesis
22%inclusion24 decks108 decks
11%synergy
Pongify
20%inclusion29 decks146 decks
-5%synergy
Harrow
18%inclusion27 decks146 decks
7%synergy
Return to Nature
18%inclusion27 decks146 decks
13%synergy
Rapid Hybridization
16%inclusion23 decks146 decks
-10%synergy
Eureka Moment
14%inclusion21 decks146 decks
3%synergy
Brainstorm
14%inclusion21 decks146 decks
0%synergy
Aetherize
14%inclusion21 decks146 decks
3%synergy
An Offer You Can't Refuse
14%inclusion20 decks146 decks
-9%synergy
Plasm Capture
13%inclusion19 decks146 decks
10%synergy
Swan Song
11%inclusion16 decks146 decks
-8%synergy
Nature's Claim
10%inclusion15 decks146 decks
0%synergy
Reality Shift
10%inclusion14 decks146 decks
-5%synergy
Archdruid's Charm
7.7%inclusion11 decks142 decks
2%synergy
Snakeskin Veil
7.5%inclusion11 decks146 decks
2%synergy
Decisive Denial
7.5%inclusion11 decks146 decks
2%synergy
Sink into Stupor
7.3%inclusion8 decks110 decks
-4%synergy
High Tide
6.8%inclusion10 decks146 decks
5%synergy
Pact of Negation
6.8%inclusion10 decks146 decks
0%synergy
Entish Restoration
6.2%inclusion9 decks146 decks
-3%synergy
Tamiyo's Safekeeping
6.2%inclusion9 decks146 decks
0%synergy
Voidslime
6.2%inclusion9 decks146 decks
1%synergy
Stubborn Denial
5.5%inclusion8 decks146 decks
3%synergy
Cancel
5.5%inclusion8 decks146 decks
3%synergy
Force of Negation
5.5%inclusion8 decks146 decks
-3%synergy
Sorceries
Nature's Lore
49%inclusion72 decks146 decks
19%synergy
Irenicus's Vile Duplication
40%inclusion58 decks146 decks
34%synergy
Three Visits
38%inclusion56 decks146 decks
15%synergy
Urban Evolution
32%inclusion47 decks146 decks
23%synergy
Explore
31%inclusion45 decks146 decks
10%synergy
Skyshroud Claim
28%inclusion41 decks146 decks
19%synergy
Crush of Tentacles
22%inclusion32 decks146 decks
21%synergy
Overwhelming Stampede
18%inclusion27 decks146 decks
6%synergy
Rite of Replication
16%inclusion24 decks146 decks
9%synergy
Last March of the Ents
14%inclusion21 decks146 decks
11%synergy
Quantum Misalignment
14%inclusion20 decks146 decks
11%synergy
Migration Path
13%inclusion19 decks146 decks
10%synergy
Harmonize
12%inclusion17 decks146 decks
6%synergy
Search for Tomorrow
12%inclusion17 decks146 decks
7%synergy
Shamanic Revelation
11%inclusion16 decks146 decks
6%synergy
Rishkar's Expertise
10%inclusion14 decks146 decks
1%synergy
Ponder
8.9%inclusion13 decks146 decks
2%synergy
Preposterous Proportions
7.8%inclusion5 decks64 decks
6%synergy
Unexpected Results
7.5%inclusion11 decks146 decks
7%synergy
Curse of the Swine
7.5%inclusion11 decks146 decks
-3%synergy
Explosive Vegetation
7.5%inclusion11 decks146 decks
2%synergy
Bala Ged Recovery
7.5%inclusion11 decks146 decks
-2%synergy
Doppelgang
7.0%inclusion10 decks143 decks
0%synergy
Nature's Rhythm
6.3%inclusion2 decks32 decks
0%synergy
Broken Bond
5.5%inclusion8 decks146 decks
1%synergy
Utility Artifacts
Swiftfoot Boots
42%inclusion61 decks146 decks
16%synergy
Helm of the Host
33%inclusion48 decks146 decks
28%synergy
Kefnet's Monument
32%inclusion46 decks146 decks
30%synergy
Lightning Greaves
24%inclusion35 decks146 decks
2%synergy
Sapphire Medallion
17%inclusion25 decks146 decks
14%synergy
Combine Chrysalis
15%inclusion22 decks146 decks
11%synergy
Monster Manual
11%inclusion16 decks146 decks
9%synergy
The Great Henge
11%inclusion16 decks146 decks
2%synergy
Urza's Incubator
11%inclusion16 decks146 decks
10%synergy
Mirror Box
10%inclusion15 decks146 decks
7%synergy
Emerald Medallion
8.9%inclusion13 decks146 decks
6%synergy
Herald's Horn
8.2%inclusion12 decks146 decks
4%synergy
Bident of Thassa
7.5%inclusion11 decks146 decks
0%synergy
Idol of Oblivion
6.8%inclusion10 decks146 decks
3%synergy
Coat of Arms
6.2%inclusion9 decks146 decks
5%synergy
Rhonas's Monument
6.2%inclusion9 decks146 decks
5%synergy
Quicksilver Amulet
5.5%inclusion8 decks146 decks
5%synergy
Enchantments
Elemental Bond
51%inclusion74 decks146 decks
45%synergy
Garruk's Uprising
45%inclusion65 decks146 decks
28%synergy
Parallel Lives
42%inclusion62 decks146 decks
37%synergy
Tribute to the World Tree
40%inclusion59 decks146 decks
34%synergy
Quest for Ula's Temple
34%inclusion50 decks146 decks
32%synergy
Ominous Seas
34%inclusion50 decks146 decks
30%synergy
Doubling Season
27%inclusion39 decks146 decks
17%synergy
Kiora Bests the Sea God
22%inclusion32 decks146 decks
20%synergy
Kindred Discovery
21%inclusion30 decks146 decks
11%synergy
Mystic Remora
15%inclusion22 decks146 decks
0%synergy
Moonlit Meditation
15%inclusion4 decks27 decks
13%synergy
Impostor Syndrome
12%inclusion3 decks25 decks
10%synergy
Khalni Heart Expedition
11%inclusion16 decks146 decks
7%synergy
Exploration
10%inclusion15 decks146 decks
-3%synergy
Unnatural Growth
10%inclusion15 decks146 decks
7%synergy
Sylvan Library
8.9%inclusion13 decks146 decks
0%synergy
Utopia Sprawl
8.2%inclusion12 decks146 decks
2%synergy
Beastmaster Ascension
8.2%inclusion12 decks146 decks
5%synergy
Levitation
7.5%inclusion11 decks146 decks
7%synergy
Primal Vigor
7.5%inclusion11 decks146 decks
4%synergy
Paradox Haze
7.5%inclusion11 decks146 decks
7%synergy
Up the Beanstalk
6.8%inclusion10 decks146 decks
3%synergy
Bounty of the Luxa
6.8%inclusion10 decks146 decks
6%synergy
Propaganda
6.8%inclusion10 decks146 decks
0%synergy
Cryptolith Rite
6.2%inclusion9 decks146 decks
3%synergy
Extravagant Replication
6.2%inclusion9 decks146 decks
4%synergy
Wilderness Reclamation
6.2%inclusion9 decks146 decks
-3%synergy
Wild Growth
6.2%inclusion9 decks146 decks
-3%synergy
Omniscience
6.2%inclusion9 decks146 decks
2%synergy
Reflections of Littjara
6.2%inclusion9 decks146 decks
-2%synergy
Primal Empathy
5.5%inclusion8 decks146 decks
3%synergy
Burgeoning
5.5%inclusion8 decks146 decks
-2%synergy
Asceticism
5.5%inclusion8 decks146 decks
2%synergy
Defense of the Heart
5.5%inclusion8 decks146 decks
3%synergy
Growing Rites of Itlimoc
5.5%inclusion8 decks146 decks
-1%synergy
Battles
Invasion of Segovia
12%inclusion18 decks146 decks
12%synergy
Invasion of Zendikar
5.5%inclusion8 decks146 decks
4%synergy
Planeswalkers
Kiora, the Crashing Wave
29%inclusion42 decks146 decks
26%synergy
Kiora, Behemoth Beckoner
11%inclusion16 decks146 decks
5%synergy
Kiora, Master of the Depths
8.2%inclusion12 decks146 decks
6%synergy
Oko, Thief of Crowns
6.8%inclusion10 decks146 decks
0%synergy
Utility Lands
Reliquary Tower
68%inclusion99 decks146 decks
18%synergy
Mosswort Bridge
32%inclusion47 decks146 decks
15%synergy
Temple of the False God
26%inclusion38 decks146 decks
10%synergy
Evendo, Waking Haven
25%inclusion7 decks28 decks
20%synergy
Yavimaya, Cradle of Growth
19%inclusion28 decks146 decks
-3%synergy
Boseiju, Who Endures
16%inclusion24 decks146 decks
-6%synergy
Rogue's Passage
16%inclusion24 decks146 decks
-5%synergy
Mystic Sanctuary
15%inclusion22 decks146 decks
2%synergy
Mistrise Village
12%inclusion4 decks34 decks
1%synergy
Three Tree City
11%inclusion11 decks100 decks
6%synergy
Coral Atoll
11%inclusion16 decks146 decks
8%synergy
Dark Depths
11%inclusion16 decks146 decks
4%synergy
Command Beacon
10%inclusion15 decks146 decks
6%synergy
Castle Garenbrig
10%inclusion15 decks146 decks
6%synergy
Castle Vantress
10%inclusion14 decks146 decks
3%synergy
Otawara, Soaring City
10%inclusion14 decks146 decks
-9%synergy
Lumbering Falls
8.2%inclusion12 decks146 decks
1%synergy
Restless Vinestalk
5.5%inclusion8 decks146 decks
0%synergy
Alchemist's Refuge
5.5%inclusion8 decks146 decks
-12%synergy
Bonders' Enclave
5.5%inclusion8 decks146 decks
4%synergy
Jungle Basin
5.5%inclusion8 decks146 decks
3%synergy
Mana Artifacts
Sol Ring
92%inclusion135 decks146 decks
12%synergy
Arcane Signet
82%inclusion120 decks146 decks
19%synergy
Simic Signet
50%inclusion73 decks146 decks
18%synergy
Thought Vessel
28%inclusion41 decks146 decks
8%synergy
Talisman of Curiosity
21%inclusion30 decks146 decks
-1%synergy
Commander's Sphere
13%inclusion19 decks146 decks
5%synergy
Decanter of Endless Water
10%inclusion15 decks146 decks
5%synergy
Thran Dynamo
10%inclusion14 decks146 decks
7%synergy
Mind Stone
5.5%inclusion8 decks146 decks
1%synergy
Lands
Island
90%inclusion131 decks146 decks
-6%synergy
Forest
90%inclusion131 decks146 decks
-6%synergy
Command Tower
87%inclusion127 decks146 decks
2%synergy
Simic Growth Chamber
65%inclusion95 decks146 decks
17%synergy
Hinterland Harbor
63%inclusion92 decks146 decks
4%synergy
Temple of Mystery
50%inclusion73 decks146 decks
12%synergy
Dreamroot Cascade
49%inclusion71 decks146 decks
7%synergy
Rejuvenating Springs
46%inclusion67 decks146 decks
2%synergy
Breeding Pool
42%inclusion61 decks146 decks
-4%synergy
Barkchannel Pathway
35%inclusion51 decks146 decks
15%synergy
Flooded Grove
35%inclusion51 decks146 decks
-6%synergy
Thornwood Falls
34%inclusion50 decks146 decks
17%synergy
Vineglimmer Snarl
31%inclusion45 decks146 decks
-8%synergy
Myriad Landscape
30%inclusion44 decks146 decks
8%synergy
Yavimaya Coast
29%inclusion43 decks146 decks
-23%synergy
Tangled Islet
28%inclusion41 decks146 decks
12%synergy
Evolving Wilds
27%inclusion40 decks146 decks
2%synergy
Willowrush Verge
24%inclusion10 decks41 decks
8%synergy
Rimewood Falls
23%inclusion33 decks146 decks
13%synergy
Misty Rainforest
21%inclusion30 decks146 decks
-11%synergy
Exotic Orchard
17%inclusion25 decks146 decks
-7%synergy
Terramorphic Expanse
16%inclusion24 decks146 decks
-3%synergy
Snow-Covered Forest
14%inclusion21 decks146 decks
8%synergy
Snow-Covered Island
14%inclusion20 decks146 decks
7%synergy
Tropical Island
14%inclusion20 decks146 decks
-1%synergy
Hedge Maze
13%inclusion19 decks143 decks
-6%synergy
Waterlogged Grove
13%inclusion19 decks146 decks
-8%synergy
Path of Ancestry
13%inclusion19 decks146 decks
-4%synergy
Overflowing Basin
12%inclusion16 decks133 decks
-7%synergy
Woodland Stream
11%inclusion16 decks146 decks
6%synergy
Simic Guildgate
11%inclusion16 decks146 decks
1%synergy
Botanical Sanctum
10%inclusion15 decks146 decks
-2%synergy
Blighted Woodland
8.9%inclusion13 decks146 decks
1%synergy
Lush Oasis
8.3%inclusion10 decks121 decks
2%synergy
Littjara Mirrorlake
8.2%inclusion12 decks146 decks
4%synergy
Bala Ged Recovery
7.5%inclusion11 decks146 decks
-2%synergy
Sink into Stupor
7.3%inclusion8 decks110 decks
-4%synergy
Fabled Passage
5.5%inclusion8 decks146 decks
-9%synergy
Cavern of Souls
5.5%inclusion8 decks146 decks
0%synergy
Glasspool Mimic
5.5%inclusion8 decks146 decks
1%synergy
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