Parasitic Impetus is a uncommon Enchantment — Aura card from Commander 2021 (C21), collector number 150. Current market price: $0.36, TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+2 and is goaded. (It attacks each combat if able and attacks a player other than you if able.) Whenever enchanted creature attacks, its controller loses 2 life and you gain 2 life.