Orc Encampment

Orcs you control have riot (This creature enters the battlefield with
your choice of a +1/+1 counter or haste.)
Whenever an orc enters the battlefield under
your control, you may pay {2}{r}{g} and sacrifice
Orc Encampment. If you do create a 4/4 red and
green beast creature token with trample, it gains
haste until end of turn.
"Clear the camp! We ride!" - Ulgart, Thunderchief