18 Island
1 Aquatic Incursion
1 Aquitect's Will
1 Colossal Whale
1 Coralhelm Commander
1 Cosi's Trickster
1 Crashing Tide
1 Deeproot Waters
1 Deepwater Hypnotist
1 Dive Down
1 Drowner of Secrets
1 Energy Flux
1 Fraying Sanity
1 Harbinger of the Tides
1 Kopala, Warden of Waves
1 Lord of Atlantis
1 Lullmage Mentor
1 Master of the Pearl Trident
1 Merfolk Sovereign
1 Merfolk Thaumaturgist
1 Merrow Commerce
1 Merrow Reejerey
1 Negate
1 River Sneak
1 Rootwater Thief
1 Run Aground
1 Seafloor Oracle
1 Sealock Monster
1 Sigil of Sleep
1 Silvergill Adept
1 Silvergill Douser
1 Spell Pierce
1 Stonybrook Banneret
1 Stream of Unconsciousness
1 Svyelun of Sea and Sky
1 Thada Adel, Acquisitor
1 Thassa, God of the Sea
1 Thassa's Rebuff
1 Tideshaper Mystic
1 Triton Shorestalker
1 Triton Tactics
1 Vapor Snag
1 Wanderwine Prophets
Sideboard:
1 Divination
1 Enclave Cryptologist
1 Fallowsage
1 Grimoire Thief
1 Ordeal of Thassa
1 Pin to the Earth
1 Reef Shaman
1 Shaper Apprentice
1 Turn the Tide
1 Wall of Frost