Rage-Chain Demon

Trample, Menace
During each upkeep, put a +1/+1 counter on
Rage-Chain Demon for each player with 10 or
less life. Then if Rage-Chain Demon has five or
more +1/+1 counters on it, it deals 5 damage to
each player with more than 10 life.
Feel the wrath of my steel, puny human!