Shrek, King Of Far Far Away

Shrek, King Of Far Far Away enters the battlefield with four +1/+1 counters on it.
Whenever another green creature enters the battlefield under your control, put a +1/+1 counter on Shrek. Then if that creature's
power is greater than Shrek's power, put another +1/+1 counter on Shrek.

"Ogres are like onions!"