Koma, Cosmos Serpent (Commander) - Core

Alternate Names:

The Monstrous SerpentThe Monstrous Serpent

Koma, Cosmos Serpent
Rank #298
594decks
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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
17%inclusion6 decks36 decks
12%synergy
Agna Qel'a
3.6%inclusion1 decks28 decks
3%synergy
Waterbender Ascension
3.6%inclusion1 decks28 decks
3%synergy
Shared Roots
3.0%inclusion1 decks33 decks
0%synergy
The Terror of Serpent's Pass
1.2%inclusion1 decks84 decks
1%synergy
High Synergy Cards
Whelming Wave
75%inclusion446 decks594 decks
64%synergy
Junk Winder
63%inclusion372 decks594 decks
56%synergy
Adrix and Nev, Twincasters
64%inclusion381 decks594 decks
56%synergy
Elemental Bond
56%inclusion330 decks594 decks
50%synergy
Koma, World-Eater
63%inclusion240 decks381 decks
50%synergy
Irenicus's Vile Duplication
48%inclusion287 decks594 decks
42%synergy
Serpent of Yawning Depths
44%inclusion260 decks594 decks
37%synergy
Garruk's Packleader
39%inclusion230 decks594 decks
36%synergy
Arixmethes, Slumbering Isle
49%inclusion293 decks594 decks
36%synergy
Kodama's Reach
72%inclusion427 decks594 decks
36%synergy
Top Cards
Cultivate
81%inclusion480 decks594 decks
34%synergy
Rampant Growth
72%inclusion427 decks594 decks
31%synergy
Counterspell
67%inclusion396 decks594 decks
17%synergy
Growth Spiral
66%inclusion394 decks594 decks
22%synergy
Beast Within
60%inclusion359 decks594 decks
10%synergy
Negate
55%inclusion328 decks594 decks
29%synergy
Aesi, Tyrant of Gyre Strait
48%inclusion285 decks594 decks
31%synergy
Tatyova, Benthic Druid
47%inclusion280 decks594 decks
16%synergy
Farseek
45%inclusion268 decks594 decks
21%synergy
Nature's Lore
45%inclusion266 decks594 decks
14%synergy
Game Changers
Seedborn Muse
10%inclusion61 decks594 decks
-5%synergy
Creatures
Spark Double
44%inclusion263 decks594 decks
35%synergy
Sakura-Tribe Elder
44%inclusion262 decks594 decks
25%synergy
Llanowar Elves
43%inclusion258 decks594 decks
16%synergy
Murkfiend Liege
43%inclusion255 decks594 decks
28%synergy
Spawning Kraken
42%inclusion249 decks594 decks
35%synergy
Slinn Voda, the Rising Deep
37%inclusion218 decks594 decks
30%synergy
Elvish Mystic
36%inclusion212 decks594 decks
12%synergy
Coiling Oracle
33%inclusion197 decks594 decks
20%synergy
Hullbreaker Horror
32%inclusion188 decks594 decks
14%synergy
Esix, Fractal Bloom
27%inclusion159 decks594 decks
23%synergy
Octomancer
26%inclusion128 decks486 decks
22%synergy
Eternal Witness
26%inclusion156 decks594 decks
5%synergy
Scourge of Fleets
26%inclusion154 decks594 decks
18%synergy
Fyndhorn Elves
25%inclusion150 decks594 decks
10%synergy
Archetype of Imagination
25%inclusion149 decks594 decks
21%synergy
Summon: Leviathan
25%inclusion38 decks153 decks
18%synergy
Sakashima the Impostor
24%inclusion142 decks594 decks
21%synergy
Nadir Kraken
23%inclusion139 decks594 decks
19%synergy
Ohran Frostfang
23%inclusion135 decks594 decks
19%synergy
Sakashima of a Thousand Faces
23%inclusion134 decks594 decks
18%synergy
Birds of Paradise
22%inclusion130 decks594 decks
-6%synergy
Reclamation Sage
21%inclusion126 decks594 decks
7%synergy
Xolatoyac, the Smiling Flood
20%inclusion117 decks594 decks
12%synergy
Enduring Vitality
18%inclusion83 decks453 decks
11%synergy
Rampaging Baloths
18%inclusion107 decks594 decks
1%synergy
Stormtide Leviathan
18%inclusion105 decks594 decks
12%synergy
Avenger of Zendikar
18%inclusion104 decks594 decks
0%synergy
Nezahal, Primal Tide
17%inclusion100 decks594 decks
6%synergy
Troyan, Gutsy Explorer
16%inclusion97 decks594 decks
13%synergy
Curiosity Crafter
16%inclusion95 decks594 decks
12%synergy
Scute Swarm
15%inclusion92 decks594 decks
-5%synergy
Inga and Esika
14%inclusion84 decks594 decks
11%synergy
Fanatic of Rhonas
14%inclusion70 decks514 decks
8%synergy
Kiora, Sovereign of the Deep
13%inclusion80 decks594 decks
11%synergy
Tromokratis
13%inclusion80 decks594 decks
8%synergy
Reef Worm
13%inclusion80 decks594 decks
10%synergy
Saryth, the Viper's Fang
11%inclusion68 decks594 decks
10%synergy
Toski, Bearer of Secrets
11%inclusion67 decks594 decks
8%synergy
Roaming Throne
11%inclusion67 decks594 decks
3%synergy
Starwinder
11%inclusion11 decks100 decks
4%synergy
Tireless Provisioner
11%inclusion65 decks594 decks
-4%synergy
Progenitor Mimic
10%inclusion62 decks594 decks
6%synergy
Enduring Curiosity
10%inclusion46 decks458 decks
7%synergy
Lotus Cobra
10%inclusion59 decks594 decks
-4%synergy
Jaheira, Friend of the Forest
10%inclusion57 decks594 decks
6%synergy
Craterhoof Behemoth
9.1%inclusion54 decks594 decks
0%synergy
Simic Sky Swallower
9.1%inclusion54 decks594 decks
5%synergy
Stormsurge Kraken
8.8%inclusion52 decks594 decks
4%synergy
Loot, Exuberant Explorer
8.5%inclusion32 decks375 decks
1%synergy
Uro, Titan of Nature's Wrath
8.2%inclusion49 decks594 decks
-2%synergy
Instants
Double Major
42%inclusion251 decks594 decks
34%synergy
Return of the Wildspeaker
36%inclusion216 decks594 decks
26%synergy
Second Harvest
35%inclusion206 decks594 decks
28%synergy
Arcane Denial
32%inclusion190 decks594 decks
9%synergy
Heroic Intervention
29%inclusion175 decks594 decks
-1%synergy
Pongify
29%inclusion173 decks594 decks
4%synergy
Simic Charm
29%inclusion171 decks594 decks
21%synergy
Rapid Hybridization
28%inclusion168 decks594 decks
2%synergy
An Offer You Can't Refuse
25%inclusion150 decks594 decks
2%synergy
Krosan Grip
25%inclusion146 decks594 decks
17%synergy
Reality Shift
23%inclusion139 decks594 decks
9%synergy
Planar Genesis
21%inclusion110 decks514 decks
11%synergy
Eureka Moment
20%inclusion118 decks594 decks
9%synergy
Snakeskin Veil
19%inclusion111 decks594 decks
13%synergy
Return to Nature
18%inclusion109 decks594 decks
13%synergy
Harrow
18%inclusion107 decks594 decks
6%synergy
Aetherize
17%inclusion99 decks594 decks
5%synergy
Nature's Claim
16%inclusion97 decks594 decks
6%synergy
Brainstorm
16%inclusion97 decks594 decks
2%synergy
Tamiyo's Safekeeping
15%inclusion87 decks594 decks
9%synergy
Voidslime
13%inclusion76 decks594 decks
8%synergy
Entish Restoration
12%inclusion70 decks594 decks
2%synergy
Perplexing Test
12%inclusion70 decks594 decks
7%synergy
Decisive Denial
11%inclusion68 decks594 decks
6%synergy
Plasm Capture
11%inclusion68 decks594 decks
8%synergy
Mystic Reflection
10%inclusion59 decks594 decks
7%synergy
Swan Song
8.6%inclusion51 decks594 decks
-10%synergy
Resculpt
8.4%inclusion50 decks594 decks
2%synergy
Saw It Coming
8.2%inclusion49 decks594 decks
7%synergy
Joint Exploration
7.9%inclusion47 decks594 decks
2%synergy
Stubborn Denial
7.7%inclusion46 decks594 decks
5%synergy
Collective Resistance
7.6%inclusion39 decks515 decks
4%synergy
Tyvar's Stand
7.2%inclusion43 decks594 decks
4%synergy
Disdainful Stroke
7.2%inclusion43 decks594 decks
6%synergy
Sublime Epiphany
6.6%inclusion39 decks594 decks
4%synergy
Sink into Stupor
6.4%inclusion33 decks515 decks
-5%synergy
Fact or Fiction
6.2%inclusion37 decks594 decks
4%synergy
Cancel
6.2%inclusion37 decks594 decks
4%synergy
Opt
6.1%inclusion36 decks594 decks
-1%synergy
Mana Drain
6.1%inclusion36 decks594 decks
-10%synergy
Archdruid's Charm
5.9%inclusion34 decks579 decks
0%synergy
Roiling Regrowth
5.4%inclusion32 decks594 decks
1%synergy
Dispel
5.4%inclusion32 decks594 decks
1%synergy
Rewind
5.4%inclusion32 decks594 decks
3%synergy
Sorceries
Explore
39%inclusion229 decks594 decks
18%synergy
Three Visits
32%inclusion191 decks594 decks
9%synergy
Skyshroud Claim
30%inclusion181 decks594 decks
21%synergy
Overwhelming Stampede
27%inclusion162 decks594 decks
15%synergy
Urban Evolution
26%inclusion156 decks594 decks
17%synergy
Shamanic Revelation
24%inclusion143 decks594 decks
19%synergy
Migration Path
21%inclusion126 decks594 decks
18%synergy
Quantum Misalignment
21%inclusion124 decks594 decks
18%synergy
Rite of Replication
17%inclusion103 decks594 decks
10%synergy
Harmonize
16%inclusion95 decks594 decks
10%synergy
Search for Tomorrow
16%inclusion95 decks594 decks
11%synergy
Explosive Vegetation
15%inclusion91 decks594 decks
10%synergy
Rishkar's Expertise
15%inclusion89 decks594 decks
7%synergy
Curse of the Swine
14%inclusion83 decks594 decks
3%synergy
Distant Melody
13%inclusion78 decks594 decks
10%synergy
Ravenform
10%inclusion60 decks594 decks
6%synergy
Ezuri's Predation
10%inclusion57 decks594 decks
2%synergy
Bala Ged Recovery
8.9%inclusion53 decks594 decks
-1%synergy
Broken Bond
8.2%inclusion49 decks594 decks
3%synergy
Doppelgang
7.8%inclusion45 decks579 decks
1%synergy
Preordain
7.7%inclusion46 decks594 decks
0%synergy
Preposterous Proportions
7.7%inclusion29 decks376 decks
6%synergy
Ponder
7.2%inclusion43 decks594 decks
0%synergy
Spitting Image
7.1%inclusion42 decks594 decks
5%synergy
Overrun
6.7%inclusion40 decks594 decks
5%synergy
Triumph of the Hordes
5.9%inclusion35 decks594 decks
3%synergy
Regrowth
5.7%inclusion34 decks594 decks
2%synergy
Bridgeworks Battle
5.6%inclusion29 decks515 decks
1%synergy
Croaking Counterpart
5.6%inclusion33 decks594 decks
1%synergy
Aggressive Biomancy
5.5%inclusion28 decks513 decks
0%synergy
Circuitous Route
5.4%inclusion32 decks594 decks
3%synergy
Vastwood Surge
5.1%inclusion30 decks594 decks
4%synergy
Repudiate // Replicate
5.1%inclusion30 decks594 decks
3%synergy
Utility Artifacts
Swiftfoot Boots
44%inclusion263 decks594 decks
19%synergy
Helm of the Host
34%inclusion201 decks594 decks
29%synergy
Combine Chrysalis
33%inclusion195 decks594 decks
29%synergy
Lightning Greaves
28%inclusion165 decks594 decks
6%synergy
Idol of Oblivion
18%inclusion109 decks594 decks
15%synergy
Mirror Box
16%inclusion96 decks594 decks
13%synergy
Bident of Thassa
15%inclusion90 decks594 decks
8%synergy
Emerald Medallion
8.9%inclusion53 decks594 decks
6%synergy
Sapphire Medallion
7.9%inclusion47 decks594 decks
5%synergy
Eldrazi Monument
6.4%inclusion38 decks594 decks
6%synergy
Kefnet's Monument
5.4%inclusion32 decks594 decks
4%synergy
Enchantments
Parallel Lives
30%inclusion176 decks594 decks
24%synergy
Garruk's Uprising
28%inclusion166 decks594 decks
12%synergy
Tribute to the World Tree
27%inclusion160 decks594 decks
21%synergy
Doubling Season
26%inclusion156 decks594 decks
17%synergy
Kindred Discovery
21%inclusion124 decks594 decks
11%synergy
Wild Growth
17%inclusion101 decks594 decks
8%synergy
Beastmaster Ascension
16%inclusion95 decks594 decks
13%synergy
Primal Vigor
15%inclusion87 decks594 decks
11%synergy
Growing Rites of Itlimoc
13%inclusion80 decks594 decks
7%synergy
Wilderness Reclamation
13%inclusion78 decks594 decks
4%synergy
Utopia Sprawl
13%inclusion77 decks594 decks
6%synergy
Ominous Seas
12%inclusion69 decks594 decks
7%synergy
Unnatural Growth
11%inclusion67 decks594 decks
8%synergy
Propaganda
10%inclusion61 decks594 decks
4%synergy
Mystic Remora
10%inclusion58 decks594 decks
-6%synergy
Kenrith's Transformation
9.4%inclusion56 decks594 decks
5%synergy
Extravagant Replication
9.1%inclusion54 decks594 decks
7%synergy
Khalni Heart Expedition
9.1%inclusion54 decks594 decks
5%synergy
Imprisoned in the Moon
9.1%inclusion54 decks594 decks
5%synergy
Paradox Haze
8.6%inclusion51 decks594 decks
8%synergy
Exploration
8.1%inclusion48 decks594 decks
-5%synergy
Verity Circle
7.4%inclusion44 decks594 decks
7%synergy
Quest for Ula's Temple
6.6%inclusion39 decks594 decks
4%synergy
Cryptolith Rite
6.4%inclusion38 decks594 decks
3%synergy
Reconnaissance Mission
5.7%inclusion34 decks594 decks
4%synergy
Impostor Syndrome
5.6%inclusion4 decks71 decks
4%synergy
Asceticism
5.1%inclusion30 decks594 decks
2%synergy
Moonlit Meditation
5.0%inclusion5 decks100 decks
4%synergy
Battles
Invasion of Segovia
7.1%inclusion42 decks594 decks
6%synergy
Invasion of Zendikar
6.1%inclusion36 decks594 decks
4%synergy
Planeswalkers
Oko, Thief of Crowns
12%inclusion70 decks594 decks
5%synergy
Kiora, the Crashing Wave
9.4%inclusion56 decks594 decks
7%synergy
Kiora, Behemoth Beckoner
9.1%inclusion54 decks594 decks
3%synergy
Kiora, Master of the Depths
5.2%inclusion31 decks594 decks
3%synergy
Utility Lands
Reliquary Tower
51%inclusion305 decks594 decks
1%synergy
Temple of the False God
23%inclusion139 decks594 decks
8%synergy
Rogue's Passage
20%inclusion117 decks594 decks
-2%synergy
Mosswort Bridge
20%inclusion116 decks594 decks
2%synergy
Mystic Sanctuary
12%inclusion72 decks594 decks
0%synergy
Yavimaya, Cradle of Growth
9.1%inclusion54 decks594 decks
-13%synergy
Castle Garenbrig
8.8%inclusion52 decks594 decks
4%synergy
Command Beacon
8.6%inclusion51 decks594 decks
5%synergy
Alchemist's Refuge
8.4%inclusion50 decks594 decks
-9%synergy
Lumbering Falls
8.1%inclusion48 decks594 decks
1%synergy
Restless Vinestalk
7.7%inclusion46 decks594 decks
2%synergy
Three Tree City
7.5%inclusion37 decks491 decks
2%synergy
Castle Vantress
6.9%inclusion41 decks594 decks
0%synergy
Boseiju, Who Endures
6.2%inclusion37 decks594 decks
-16%synergy
Mistrise Village
6.1%inclusion12 decks198 decks
-5%synergy
Otawara, Soaring City
5.2%inclusion31 decks594 decks
-14%synergy
Mana Artifacts
Sol Ring
86%inclusion513 decks594 decks
6%synergy
Arcane Signet
72%inclusion425 decks594 decks
9%synergy
Simic Signet
47%inclusion279 decks594 decks
15%synergy
Thought Vessel
34%inclusion200 decks594 decks
13%synergy
Talisman of Curiosity
28%inclusion169 decks594 decks
7%synergy
Commander's Sphere
19%inclusion115 decks594 decks
11%synergy
Fellwar Stone
11%inclusion67 decks594 decks
2%synergy
Decanter of Endless Water
8.6%inclusion51 decks594 decks
3%synergy
Mind Stone
8.4%inclusion50 decks594 decks
4%synergy
Thran Dynamo
7.9%inclusion47 decks594 decks
5%synergy
Lands
Island
96%inclusion570 decks594 decks
1%synergy
Forest
96%inclusion569 decks594 decks
1%synergy
Command Tower
85%inclusion502 decks594 decks
-1%synergy
Simic Growth Chamber
55%inclusion329 decks594 decks
7%synergy
Hinterland Harbor
54%inclusion322 decks594 decks
-5%synergy
Yavimaya Coast
50%inclusion295 decks594 decks
-3%synergy
Temple of Mystery
46%inclusion273 decks594 decks
8%synergy
Vineglimmer Snarl
42%inclusion251 decks594 decks
4%synergy
Dreamroot Cascade
39%inclusion230 decks594 decks
-3%synergy
Flooded Grove
37%inclusion222 decks594 decks
-3%synergy
Evolving Wilds
33%inclusion197 decks594 decks
8%synergy
Myriad Landscape
32%inclusion193 decks594 decks
10%synergy
Rejuvenating Springs
31%inclusion186 decks594 decks
-13%synergy
Thornwood Falls
30%inclusion179 decks594 decks
12%synergy
Exotic Orchard
27%inclusion161 decks594 decks
3%synergy
Tangled Islet
27%inclusion159 decks594 decks
10%synergy
Terramorphic Expanse
24%inclusion145 decks594 decks
5%synergy
Breeding Pool
22%inclusion133 decks594 decks
-23%synergy
Rimewood Falls
21%inclusion125 decks594 decks
12%synergy
Barkchannel Pathway
20%inclusion118 decks594 decks
0%synergy
Simic Guildgate
18%inclusion108 decks594 decks
8%synergy
Overflowing Basin
17%inclusion96 decks560 decks
-2%synergy
Waterlogged Grove
14%inclusion85 decks594 decks
-6%synergy
Path of Ancestry
14%inclusion83 decks594 decks
-3%synergy
Blighted Woodland
12%inclusion73 decks594 decks
5%synergy
Misty Rainforest
10%inclusion61 decks594 decks
-21%synergy
Hedge Maze
10%inclusion59 decks580 decks
-9%synergy
Littjara Mirrorlake
10%inclusion60 decks594 decks
6%synergy
Fabled Passage
10%inclusion59 decks594 decks
-5%synergy
Willowrush Verge
9.3%inclusion25 decks269 decks
-7%synergy
Botanical Sanctum
9.1%inclusion54 decks594 decks
-3%synergy
Bala Ged Recovery
8.9%inclusion53 decks594 decks
-1%synergy
Woodland Stream
8.6%inclusion51 decks594 decks
3%synergy
Quandrix Campus
7.6%inclusion45 decks594 decks
1%synergy
Glasspool Mimic
7.2%inclusion43 decks594 decks
3%synergy
Snow-Covered Island
6.7%inclusion40 decks594 decks
0%synergy
Snow-Covered Forest
6.7%inclusion40 decks594 decks
0%synergy
Sink into Stupor
6.4%inclusion33 decks515 decks
-5%synergy
Lush Oasis
5.9%inclusion32 decks544 decks
0%synergy
Bridgeworks Battle
5.6%inclusion29 decks515 decks
1%synergy
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