Implement of Ferocity is a common Artifact card from Aether Revolt (AER), collector number 157. Current market price: $0.18 (foil $0.40), TCGplayer market prices via Scryfall.
{G}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery. When this artifact is put into a graveyard from the battlefield, draw a card.