Argivian Avenger is a uncommon Artifact Creature — Shapeshifter card from The Brothers' War (BRO), collector number 232. Current market price: $0.06 (foil $0.23), TCGplayer market prices via Scryfall.
{1}: Until end of turn, this creature gets -1/-1 and gains your choice of flying, vigilance, deathtouch, or haste.