Urag, the Skullcrusher

Trample
Rampage - Whenever a creature you control
attacks, put a +1/+1 counter on Urag, then you
may have Urag fight target creature you don't
control.
Other creatures, you control get +X/+X where
X is the number of +1/+1 counters on Urag.

You don't want to know how it got its name.