Mohg, Lord of Blood

Whenever Mohg, Lord of Blood attacks for the
first time each turn, you may put a Blood Curse counter on target creature an opponent controls.
When that creature dies, create a Blood token.
Nihil! Nihil! Nihil! — {4}{b}{r}, {t}: Put a -1/-1
counter on each creature with a Blood Curse
counter on it. Then, you may repeat this process
up to two additional times.