Kopala, Warden of Waves is a rare Legendary Creature — Merfolk Wizard card from The Lost Caverns of Ixalan Commander (LCC), collector number 160. Current market price: $0.35, 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.