Overengineered Behemoth

Overengineered Behemoth enters the battlefield with eight +1/+1 counters on it.
Whenever one or more +1/+1 counters are placed on a creature you control, remove a +1/+1 counter from Overengineered Behemoth.
Overengineered Behemoth cant attack as long as its power is 6 or greater.
Simic scientists often go overboard with their mutations and he is the result.