Grisen, Angry Pig

Grisen, Angry Pig enters the battlefield with
three anger counters. He has power and
toughness equal to the number of anger counters.
Whenever Grisen attacks, remove one anger
counter. At the beginning of your upkeep, put an
anger counter on Grisen.
At the beginning of your
upkeep, if Grisen has five or more anger
counters, he deals 5 damage to his controller.