1 Castle Vantress
1 Cavern of Souls
1 Flooded Strand
21 Island
1 Minamo, School at Water's Edge
1 Misty Rainforest
1 Mutavault
1 Mystic Sanctuary
1 Nykthos, Shrine to Nyx
1 Polluted Delta
1 Riptide Laboratory
1 Scalding Tarn
1 Strip Mine
1 Urza's Saga
1 Wasteland
1 Aether Vial
1 Azami, Lady of Scrolls
1 Bident of Thassa
1 Brazen Borrower // Petty Theft
1 Coralhelm Commander
1 Counterspell
1 Cursecatcher
1 Cyclonic Rift
1 Emperor Mihail II
1 Fierce Guardianship
1 Force of Negation
1 Force of Will
1 Glasspool Mimic // Glasspool Shore
1 Harbinger of the Tides
1 Kopala, Warden of Waves
1 Lord of Atlantis
1 Mana Drain
1 Master of the Pearl Trident
1 Master of Waves
1 Merchant Scroll
1 Merfolk Sovereign
1 Merfolk Trickster
1 Merrow Reejerey
1 Mistcaller
1 Mystic Remora
1 Mystical Tutor
1 Narset, Parter of Veils
1 Paradigm Shift
1 Phantasmal Image
1 Phyrexian Metamorph
1 Pongify
1 Propaganda
1 Rapid Hybridization
1 Reality Shift
1 Rhystic Study
1 Rishadan Dockhand
1 Seafloor Oracle
1 Seahunter
1 Silvergill Adept
1 Sol Ring
1 Spreading Seas
1 Subtlety
1 Surgespanner
1 Svyelun of Sea and Sky
1 Tempest Caller
1 Thassa, Deep-Dwelling
1 Thassa, God of the Sea
1 Thassa's Oracle
1 The One Ring
1 Thieving Skydiver
1 Throne of Eldraine
1 Tide Shaper
1 Tidebinder Mage
1 True-Name Nemesis
1 Venser, Shaper Savant
1 Vodalian Hexcatcher
1 Voidmage Prodigy
1 Wake Thrasher
1 Windfall
Sideboard:
1 Ancient Tomb
1 Chrome Mox
1 Gemstone Caverns
1 Jeweled Lotus
1 Mana Crypt