Tarrian's Soulcleaver
Legendary Artifact — Equipment
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 
Tarrian's holy weapon still holds a fragment of his dark power... and his hunger.
Illustrated by
The Lost Caverns of Ixalan#389RareEnglish