1 Arcane Lighthouse
27 Island
1 Miren, the Moaning Well
1 Nykthos, Shrine to Nyx
1 Radiant Fountain
1 Reliquary Tower
1 Remote Isle
1 Rogue's Passage
1 Soaring Seacliff
1 Teferi's Isle
1 Aqueous Form
1 Arcanis the Omnipotent
1 Archetype of Imagination
1 Blue Sun's Zenith
1 Brainstorm
1 Breaching Leviathan
1 Bribery
1 Cackling Counterpart
1 Caged Sun
1 Chasm Skulker
1 Clever Impersonator
1 Clone Legion
1 Colossal Whale
1 Coma Veil
1 Control Magic
1 Counterspell
1 Crush of Tentacles
1 Dissipate
1 Draining Whelk
1 Dramatic Reversal
1 Fabricate
1 Fish
1 Frog Lizard
1 Harbinger of the Tides
1 High Tide
1 Inkfathom Divers
1 Inkwell Leviathan
1 Kederekt Leviathan
1 Keiga, the Tide Star
1 Kraken
1 Lorthos, the Tidemaker
1 Mana Short
1 Merchant Scroll
1 Merfolk Wayfinder
1 Merrow Levitator
1 Mirari
1 Mulldrifter
1 Negate
1 Nevinyrral's Disk
1 Octopus
1 Phyrexian Ingester
1 Rapid Hybridization
1 Reef Worm
1 Rhystic Study
1 Rite of Replication
1 Sapphire Medallion
1 Scourge of Fleets
1 Sensei's Divining Top
1 Serpent of the Endless Sea
1 Shipbreaker Kraken
1 Simic Fluxmage
1 Sol Ring
1 Solemn Simulacrum
1 Spire Serpent
1 Squid
1 Stonybrook Angler
1 Stormtide Leviathan
1 Swan Song
1 Swiftfoot Boots
1 Teferi, Temporal Archmage
1 Thassa, God of the Sea
1 Thought Vessel
1 Thran Dynamo
1 Tormod's Crypt
1 Tromokratis
1 Vedalken Shackles
1 Volition Reins
1 Wash Out
1 Whale
1 Whelming Wave
Sideboard:
1 Dismiss
1 Ethersworn Adjudicator
1 Jolting Merfolk
1 Magister Sphinx
1 Negate
1 Overwhelming Denial