Kopala, Warden of Waves is a rare Legendary Creature — Merfolk Wizard card from Ixalan (XLN), collector number 61. Current market price: $0.40 (foil $1.84), 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.