Kopala, Warden of Waves is a rare Legendary Creature — Merfolk Wizard card from Ixalan Promos (PXLN), collector number 61p. Current market price: $5.40 (foil $5.96), TCGplayer market prices via Scryfall.
Spells your opponents cast that target a Merfolk you control cost {2} more to cast. Abilities your opponents activate that target a Merfolk you control cost {2} more to activate.