Cold-Eyed Selkie is a rare Creature — Merfolk Rogue card from The Lost Caverns of Ixalan Commander (LCC), collector number 266. Current market price: $0.28, TCGplayer market prices via Scryfall.
Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Whenever this creature deals combat damage to a player, you may draw that many cards.