Baseball Bat is a uncommon Artifact — Equipment card from Duskmourn: House of Horror (DSK), collector number 209. Current market price: $0.18 (foil $0.20), TCGplayer market prices via Scryfall.
When this Equipment enters, attach it to target creature you control. Equipped creature gets +1/+1. Whenever equipped creature attacks, tap up to one target creature. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)