1 Halimar Depths
30 Island
1 Mystic Sanctuary
1 Path of Ancestry
1 Reliquary Tower
1 Svyelunite Temple
1 Aetherize
1 Aquatic Incursion
1 Aqueous Form
1 Arcane Denial
1 Arcane Signet
1 Benthic Biomancer
1 Breaking Wave
1 Coralhelm Commander
1 Counterspell
1 Curiosity
1 Deeproot Waters
1 Distant Melody
1 Emperor Mihail II
1 Enclave Cryptologist
1 High Tide
1 Kindred Discovery
1 Kopala, Warden of Waves
1 Lightning Greaves
1 Liquimetal Torque
1 Master of the Pearl Trident
1 Merfolk Looter
1 Merfolk Skyscout
1 Merfolk Sovereign
1 Merrow Commerce
1 Merrow Reejerey
1 Midnight Clock
1 Mind Stone
1 Mist Dancer
1 Mist-Cloaked Herald
1 Mystic Remora
1 Negate
1 Ponder
1 Pongify
1 Propaganda
1 Rapid Hybridization
1 Reality Shift
1 Reconnaissance Mission
1 Reflections of Littjara
1 Resculpt
1 Rishadan Dockhand
1 Rite of Replication
1 River Sneak
1 River's Rebuke
1 Sea Scryer
1 Seafloor Oracle
1 Shipwreck Dowser
1 Silvergill Adept
1 Siren's Call
1 Slinn Voda, the Rising Deep
1 Sol Ring
1 Spelljack
1 Spreading Seas
1 Stonybrook Banneret
1 Streambed Aquitects
1 Surgespanner
1 Svyelun of Sea and Sky
1 Swan Song
1 Swiftfoot Boots
1 Thassa, God of the Sea
1 Thieving Skydiver
1 Thought Vessel
1 Tide Shaper
1 Triton Shorestalker
1 True-Name Nemesis
1 Watertrap Weaver
Sideboard:
1 Aquitect's Will
1 Bident of Thassa
1 Coastal Piracy
1 Cursecatcher
1 Deepchannel Mentor
1 Defiler of Dreams
1 Ensnare
1 Filter Out
1 Glasspool Mimic // Glasspool Shore
1 Gray Harbor Merfolk
1 Harbinger of the Tides
1 Heraldic Banner
1 Inundate
4 Island
1 Lord of Atlantis
1 Lullmage Mentor
1 Merfolk Trickster
1 Merrow Harbinger
1 Misleading Signpost
1 Mutavault
1 Otawara, Soaring City
1 Riptide Laboratory
1 Rogue's Passage
1 Savor the Moment
1 Sigil Tracer
1 Stormtide Leviathan
1 Svyelunite Priest
1 Tempest Caller
1 Thada Adel, Acquisitor
1 Tishana's Tidebinder
1 Vodalian Hexcatcher
1 Wake Thrasher
1 Wanderwine Prophets