Defiler of Instinct is a rare Creature — Phyrexian Kavu card from Dominaria United Promos (PDMU), collector number 119p. Current market price: $0.78 (foil $0.94), TCGplayer market prices via Scryfall.
First strike As an additional cost to cast red permanent spells, you may pay 2 life. Those spells cost {R} less to cast if you paid life this way. This effect reduces only the amount of red mana you pay. Whenever you cast a red permanent spell, this creature deals 1 damage to any target.