Heart-Piercer Bow is a common Artifact — Equipment card from Core Set 2020 (M20), collector number 228. Current market price: $0.06 (foil $0.18), 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.)