Mogh, Lord of Blood

Whenever Mogh attacks, put a Nihil counter on
him, then each creature defending player controls
gets -1/-1 until end of turn for each Nihil counter
on Mogh.
At the beginning of your upkeep, if Mogh has
three or more Nihil counters on him, remove all
Nihil counters from Mogh and Mogh deals 8
damage to each opponent.