Ashnod's Harvester is a uncommon Artifact Creature — Construct card from The Brothers' War (BRO), collector number 117. Current market price: $0.20 (foil $0.24), TCGplayer market prices via Scryfall.
Whenever this creature attacks, exile target card from a graveyard. Unearth {1}{B} ({1}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)