Duracell bunny

Double strike, reach, trample.
Whenever Duracell bunny get's 1 or more {e} counter's on it, put that many +1/+1 counter's
on Duracell bunny. Duracell bunny enters the battlefield with {e}{e}.
{x}, {t}: put X {e} counter's on Duracell bunny.
X is what ever you want.
{ut}{6}: remove 5 {e} counter's from Duracell bunny.