Bulking booty

At the beginning of combat on your turn, put 2 +1/+1 counters on bulking booty.
At the end of your turn, if bulking booty didn't attack this turn, remove all +1/+1 counters from bulking booty.
Trample
Bulking booty has vigilance and reach as long as it has 5 or more +1/+1 counter on it.