Audacity is a uncommon Enchantment — Aura card from The Brothers' War (BRO), collector number 169. Current market price: $0.34 (foil $0.41), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+0 and has trample. (It can deal excess combat damage to the player or planeswalker it's attacking.) When this Aura is put into a graveyard from the battlefield, draw a card.