Vilis, Broker of Blood is a rare Legendary Creature — Demon card from Secret Lair Drop (SLD), collector number 1567. Current market price: $19.72, TCGplayer market prices via Scryfall.
Flying {B}, Pay 2 life: Target creature gets -1/-1 until end of turn. Whenever you lose life, draw that many cards. (Damage causes loss of life.)