Parasitic Grasp is a uncommon Instant card from Innistrad: Crimson Vow (VOW), collector number 123. Current market price: $0.15 (foil $0.24), TCGplayer market prices via Scryfall.
Cleave {1}{B}{B} (You may cast this spell for its cleave cost. If you do, remove the words in square brackets.) Parasitic Grasp deals 3 damage to target [Human] creature. You gain 3 life.