Parasitic Impetus is a common Enchantment — Aura card from Ravnica: Clue Edition (CLU), collector number 118. Current market price: $0.19, 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.