Vodalian Hexcatcher is a rare Creature — Merfolk Wizard card from Dominaria United Promos (PDMU), collector number 75p. Current market price: $5.35 (foil $6.98), TCGplayer market prices via Scryfall.
Flash Other Merfolk you control get +1/+1. Sacrifice a Merfolk: Counter target noncreature spell unless its controller pays {1}.