1 Halimar Depths
33 Island
1 Myriad Landscape
1 Aethersquall Ancient
1 Aqueous Form
1 Arrester's Admonition
1 Augur of Bolas
1 Bident of Thassa
1 Blink of an Eye
1 Bond of Insight
1 Borrowing 100,000 Arrows
1 Breaching Leviathan
1 Burnished Hart
1 Cancel
1 Choking Tethers
1 Crush of Tentacles
1 Curator's Ward
1 Curse of the Swine
1 Cyclonic Rift
1 Damping Sphere
1 Deep Freeze
1 Deep-Sea Kraken
1 Deepchannel Mentor
1 Disperse
1 Dissipation Field
1 Dissolve
1 Divination
1 Engulf the Shore
1 Fleet Swallower
1 Flood of Recollection
1 God-Pharaoh's Statue
1 Griptide
1 Harbinger of the Tides
1 High Tide
1 Icy Manipulator
1 Inkwell Leviathan
1 Kasmina's Transmutation
1 Kraken of the Straits
1 Lorthos, the Tidemaker
1 Mana Leak
1 Merfolk Trickster
1 Mesmerizing Benthid
1 Mistcaller
1 Opt
1 Polymorphist's Jest
1 Quest for Ula's Temple
1 Reef Worm
1 Revolutionary Rebuff
1 Rush of Knowledge
1 Salvager of Secrets
1 Scourge of Fleets
1 Sentinel of the Pearl Trident
1 Serpent of the Endless Sea
1 Shipbreaker Kraken
1 Sky Swallower
1 Slinn Voda, the Rising Deep
1 Stormtide Leviathan
1 Tamiyo's Epiphany
1 Teferi's Time Twist
1 Tempest Caller
1 Thassa's Bounty
1 Time of Ice
1 Tromokratis
1 Unwind
1 Vapor Snag
1 Venser, Shaper Savant
1 Waterknot
1 Whelming Wave
Sideboard:
1 Arcane Denial
1 Coralhelm Guide
1 Counterspell
1 Detection Tower
1 Diamond Mare
1 Empress Galina
1 Essence Scatter
1 Grozoth
1 Harbor Serpent
1 Inundate
1 Kederekt Leviathan
1 Kiora's Dambreaker
1 Man-o'-War
1 Nexus of Fate
1 Nykthos, Shrine to Nyx
1 Omniscience
1 Propaganda
1 Reef Shaman
1 Rhystic Study
1 Stormsurge Kraken
1 Strider Harness
1 Summary Dismissal
1 Swiftfoot Boots
1 Thassa, God of the Sea
1 Thought Vessel
1 Triton Tactics
1 Uncomfortable Chill
1 Vodalian Arcanist