Vengeful Bone Colossus

Indestructible, Trample
Can't attack or block.
When Vengeful Bone Colossus enters the battlefield put a +1/+1 counter on it.
Whenever a skeleton leaves the battlefield
put 3 +1/+1 counter on this card.
When this card has a higher power than one of
your opponents life total this card loses
"Can't attack".
Whenever this card deals combat damage to an opponent remove 5 +1/+1 counter from it.