Deepfathom Skulker is a rare Creature — Eldrazi card from Oath of the Gatewatch (OGW), collector number 43. Current market price: $0.34 (foil $0.68), TCGplayer market prices via Scryfall.
Devoid (This card has no color.) Whenever a creature you control deals combat damage to a player, you may draw a card. {3}{C}: Target creature can't be blocked this turn. ({C} represents colorless mana.)