Spiked Ripsaw is a uncommon Artifact — Equipment card from Innistrad: Double Feature (DBL), collector number 487. Current market price: $0.18 (foil $0.25), TCGplayer market prices via Scryfall.
Equipped creature gets +3/+3. Whenever equipped creature attacks, you may sacrifice a Forest. If you do, that creature gains trample until end of turn. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)