1 Cephalid Coliseum
1 Coral Atoll
1 Halimar Depths
1 Ice Floe
28 Island
1 Lonely Sandbar
1 Minamo, School at Water's Edge
1 Myriad Landscape
1 Nykthos, Shrine to Nyx
1 Teferi's Isle
1 Terramorphic Expanse
1 Thawing Glaciers
1 Aboshan, Cephalid Emperor
1 Bident of Thassa
1 Breaking Wave
1 Capsize
1 Chromeshell Crab
1 Coastal Piracy
1 Colossal Whale
1 Coralhelm Commander
1 Deep-Sea Kraken
1 Devastation Tide
1 Dulcet Sirens
1 Empress Galina
1 Explorer's Scope
1 Fathom Trawl
1 Flood
1 Floodgate
1 Giant Oyster
1 Griptide
1 Guard Gomazoa
1 High Tide
1 Homarid Spawning Bed
1 Hypnotic Siren
1 Inkwell Leviathan
1 Into the Roil
1 Inundate
1 Jace's Mindseeker
1 Keiga, the Tide Star
1 King Crab
1 Lorthos, the Tidemaker
1 Man-o'-War
1 Master of Waves
1 Mystic Remora
1 Old Man of the Sea
1 Pearl Lake Ancient
1 Quest for Ula's Temple
1 Rootwater Thief
1 Sand Squid
1 Scourge of Fleets
1 Sea Gate Loremaster
1 Sea Gate Oracle
1 Sea God's Revenge
1 Sea Scryer
1 Sealock Monster
1 Seasinger
1 Shipbreaker Kraken
1 Siren of the Fanged Coast
1 Spreading Seas
1 Star Compass
1 Stormsurge Kraken
1 Stormtide Leviathan
1 Streambed Aquitects
1 Submerge
1 Sunken City
1 Thada Adel, Acquisitor
1 Thassa, God of the Sea
1 Thassa's Emissary
1 Tidebinder Mage
1 Tromokratis
1 Vortex Elemental
1 Wake Thrasher
1 Whelming Wave
Sideboard:
1 Alluring Siren
1 Cephalid Broker
1 Cephalid Looter
1 Chisei, Heart of Oceans
1 Coral Net
1 Draining Whelk
1 Enclave Cryptologist
1 Flooded Shoreline
1 Ghost Ship
1 Gomazoa
1 Great Whale
1 Grozoth
1 Halimar Wavewatch
1 Homarid Shaman
1 Inexorable Tide
1 Merchant Ship
1 Merfolk Seastalkers
1 Mysteries of the Deep
1 Part Water
1 Pirate Ship
1 Research the Deep
1 Roil Elemental
1 Sea Monster
1 Sea Serpent
1 Sea Snidd
1 Sea Spirit
1 Sea Sprite
1 Seahunter
1 Segovian Leviathan
1 Serpent of the Endless Sea
1 Slipstream Eel
1 Spiny Starfish
1 Tidal Kraken
1 Tidal Wave
1 Tideforce Elemental
1 Tidespout Tyrant
1 Tidewalker
1 Treasure Trove
1 Trench Gorger
1 War Barge