Dagger of the Worthy is a uncommon Artifact — Equipment card from Hour of Devastation (HOU), collector number 160. Current market price: $0.15 (foil $0.23), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+0 and has afflict 1. (Whenever it becomes blocked, defending player loses 1 life.) Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)