Moonstone Eulogist is a rare Creature — Bat Warlock card from Bloomburrow Commander (BLC), collector number 54. Current market price: $0.47, TCGplayer market prices via Scryfall.
Flying Whenever a creature an opponent controls dies, you create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.") Whenever you sacrifice an artifact, put a +1/+1 counter on this creature and you gain 1 life.