Essence Depleter is a uncommon Creature — Eldrazi Drone card from Oath of the Gatewatch (OGW), collector number 69. Current market price: $0.06 (foil $0.52), TCGplayer market prices via Scryfall.
Devoid (This card has no color.) {1}{C}: Target opponent loses 1 life and you gain 1 life. ({C} represents colorless mana.)