Rotar, Hungering Tyrant

Devour 2 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that twice many +1/+1 counters on it.)
{x}{b}{r}{g}, {t}: Remove X +1/+1 counters
from target creature you control, target
player sacrifices permanents equal the +1/+1 counters removed this way.