1 Aboshan, Cephalid Emperor
1 Abyssal Harvester
1 Arcane Heist
1 Archmage's Charm
1 Ardyn, the Usurper
1 Benthic Behemoth
1 Bitter Triumph
1 Bog Serpent
1 Brinelin, the Moon Kraken
1 Cephalid Facetaker
1 Cephalid Retainer
1 Cephalid Vandal
1 Codex Shredder
1 Come Back Wrong
1 Daggermaw Megalodon
1 Deep-Sea Kraken
1 Deepglow Skate
1 Denizen of the Deep
1 Didn't Say Please
1 Dimir Charm
1 Dread Return
1 Drown in the Loch
1 Duelist of the Mind
1 Eater of Days
1 Enter the Enigma
1 Extract from Darkness
1 Feed the Swarm
1 Fleet Swallower
1 Fleeting Reflection
1 Frantic Search
1 Glasses of Urza
1 Grappling Kraken
1 Grindclock
1 Hedron Crab
1 Hydroelectric Specimen // Hydroelectric Laboratory
1 Icebreaker Kraken
1 Iceridge Serpent
1 Infernal Grasp
1 Inkwell Leviathan
1 Island Fish Jasconius
1 Jace's Mindseeker
1 Jill, Shiva's Dominant // Shiva, Warden of Ice
1 Jokulmorder
1 Kapsho Kitefins
1 Kraken of the Straits
1 Lazav, Dimir Mastermind
1 Lazav, Familiar Stranger
1 Likeness Looter
1 Loch Mare
1 Lochmere Serpent
1 Lorthos, the Tidemaker
1 Magic Damper
1 Marauding Brinefang
1 Marjhan
1 Marvo, Deep Operative
1 Metamorphic Blast
1 Millikin
1 Mirrorshell Crab
1 Murder
1 Nadir Kraken
1 Naga Fleshcrafter
1 Nemesis of Reason
1 Octavia, Living Thesis
1 Peek
1 Phage the Untouchable
1 Polar Kraken
1 Price of Fame
1 Quest for Ula's Temple
1 Rattleback Apothecary
1 Relm's Sketching
1 Runo Stromkirk // Krothuss, Lord of the Deep
1 Seize the Secrets
1 Serpent of Yawning Depths
1 Shield Broker
1 Shipbreaker Kraken
1 Siphon Insight
1 Sky Swallower
1 Skyswimmer Koi
1 Slip Out the Back
1 Spawning Kraken
1 Starwinder
1 Stinging Lionfish
1 Stormtide Leviathan
1 Striped Riverwinder
1 Summon: Leviathan
1 Sword Coast Serpent // Capsizing Wave
1 Syr Konrad, the Grim
1 Take the Fall
1 Terror Tide
1 The Key to the Vault
1 The Watcher in the Water
1 Theoretical Duplication
1 Thought Scour
1 Three Steps Ahead
1 Tidal Kraken
1 Tidal Terror
1 Tolarian Serpent
1 Tragic Slip
1 Trench Behemoth
1 Tromokratis
1 Tyrant's Scorn
1 Ultros, Obnoxious Octopus
1 Unlicensed Hearse
1 Vesuvan Drifter
1 Wayfarer's Bauble
1 Winds of Rebuke
1 Wormfang Manta
1 Wormhole Serpent
1 Wrexial, the Risen Deep
Sideboard:
1 Isleback Spawn