Urif, Leader of the Wilds

Champion all Beasts (When this enters the battlefield, sacrifice it unless you exile all other
Beasts you control. When this leaves the battlefield, those cards return to the battlefield.)
{x}{r}{r}{r}: Create a token copy of a Beast exiled
with Urif, Leader of the Wilds where X is the
Beast's power. It gains haste and "Sacrifice this creature at the beginning of the next end step"