20 Island
4 Mutavault
4 Benthic Biomancer
4 Harbinger of the Tides
2 Kopala, Warden of Waves
4 Master of Waves
4 Merfolk Trickster
2 Mist-Cloaked Herald
4 Silvergill Adept
4 Siren Stormtamer
4 Tempest Djinn
4 Thassa, God of the Sea
Sideboard:
2 Mist-Cloaked Herald
2 Rapid Hybridization
4 Sorcerous Spyglass
3 Spell Pierce
4 Wizard's Retort