Ayli, Eternal Pilgrim is a rare Legendary Creature — Kor Cleric card from Oath of the Gatewatch (OGW), collector number 151. Current market price: $0.64 (foil $3.28), TCGplayer market prices via Scryfall.
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.) {1}, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness. {1}{W}{B}, Sacrifice another creature: Exile target nonland permanent. Activate only if you have at least 10 life more than your starting life total.