4 Breeding Pool
2 Forest
4 Hinterland Harbor
5 Island
3 Temple of Mystery
4 Unclaimed Territory
4 Benthic Biomancer
4 Brineborn Cutthroat
3 Crashing Tide
3 Deeproot Champion
4 Dive Down
3 Kumena's Speaker
4 Merfolk Trickster
4 Opt
2 Spell Pierce
4 Swift Warden
3 Vivien, Champion of the Wilds
Sideboard:
2 Blink of an Eye
1 Deeproot Waters
2 Disdainful Stroke
2 Dive Down
2 Frilled Mystic
4 Negate
2 Vivien, Champion of the Wilds