Heavy Mattock is a common Artifact — Equipment card from Dark Ascension (DKA), collector number 150. Current market price: $0.13 (foil $0.16), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1. As long as equipped creature is a Human, it gets an additional +1/+1. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)