Anti-Venom, Horrifying Healer is a mythic Legendary Creature — Symbiote Hero card from Through the Omenpaths (OM1), collector number 22.
When Anti-Venom enters, if he was cast, return target creature card from your graveyard to the battlefield. If damage would be dealt to Anti-Venom, prevent that damage and put that many +1/+1 counters on him.