Mire Triton is a uncommon Creature — Zombie Merfolk card from Theros Beyond Death (THB), collector number 105. Current market price: $0.22 (foil $0.46), TCGplayer market prices via Scryfall.
Deathtouch When this creature enters, mill two cards and you gain 2 life. (To mill two cards, put the top two cards of your library into your graveyard.)