Heart-Piercer Bow is a common Artifact — Equipment card from Jumpstart 2022 (J22), collector number 773. Current market price: $0.15, TCGplayer market prices via Scryfall.
Whenever equipped creature attacks, this Equipment deals 1 damage to target creature defending player controls. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)