43 Island
1 Aethersquall Ancient
1 Aethertide Whale
1 Archetype of Imagination
1 Benthic Behemoth
1 Breaching Leviathan
1 Chasm Skulker
1 Colossal Whale
1 Coral Barrier
1 Crush of Tentacles
1 Cryptic Serpent
1 Deep-Sea Kraken
1 Deep-Sea Serpent
1 Deep-Sea Terror
1 Deepchannel Mentor
1 Denizen of the Deep
1 Elder Deep-Fiend
1 Frilled Sea Serpent
1 Giant Octopus
1 Giant Oyster
1 Grozoth
1 Harbor Serpent
1 High Seas
1 High Tide
1 Inkwell Leviathan
1 Kederekt Leviathan
1 Kraken Hatchling
1 Kraken of the Straits
1 Lorthos, the Tidemaker
1 Nezahal, Primal Tide
1 Pearl Lake Ancient
1 Quest for Ula's Temple
1 Reef Shaman
1 River Serpent
1 Sand Squid
1 Sandbar Serpent
1 Scourge of Fleets
1 Sea Monster
1 Sealock Monster
1 Serpent of the Endless Sea
1 Shipbreaker Kraken
1 Shoal Serpent
1 Sigiled Starfish
1 Slinn Voda, the Rising Deep
1 Sliptide Serpent
1 Stormsurge Kraken
1 Stormtide Leviathan
1 Striped Riverwinder
1 Thassa, God of the Sea
1 Thing in the Ice // Awoken Horror
1 Tidal Force
1 Tidal Kraken
1 Tromokratis
1 Vortex Elemental
1 Walking Sponge
1 Wall of Kelp
1 Whelming Wave
Sideboard:
1 Chromeshell Crab
1 Dreamwinder
1 Gearseeker Serpent
1 Kukemssa Serpent
1 Marjhan
1 Polar Kraken
1 Scrapdiver Serpent
1 Seasinger
1 Taniwha