20 Island
3 Mutavault
2 Brazen Borrower // Petty Theft
4 Curious Obsession
2 Gadwick, the Wizened
4 Harbinger of the Tides
4 Master of Waves
2 Mausoleum Wanderer
4 Merfolk Trickster
4 Siren Stormtamer
4 Tempest Djinn
4 Thassa, God of the Sea
3 Wizard's Retort
Sideboard:
4 Dive Down
3 Entrancing Melody
4 Negate
3 Pithing Needle
1 Spell Pierce