Attack-in-the-Box is a uncommon Artifact Creature — Toy card from Duskmourn: House of Horror (DSK), collector number 242. Current market price: $0.20 (foil $0.30), TCGplayer market prices via Scryfall.
Whenever this creature attacks, you may have it get +4/+0 until end of turn. If you do, sacrifice it at the beginning of the next end step.