Acquired Mutation is a uncommon Enchantment — Aura card from Fallout (PIP), collector number 53. Current market price: $0.30 (foil $1.17), 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, defending player gets two rad counters.