Tarrian's Soulcleaver is a rare Legendary Artifact — Equipment card from Secret Lair Drop (SLD), collector number 2224. Current market price: $2.85, TCGplayer market prices via Scryfall.
Equipped creature has vigilance. Whenever another artifact or creature is put into a graveyard from the battlefield, put a +1/+1 counter on equipped creature. Equip {2}