Beorn

Trample
{2}{r}{g}: Monstrosity 3. (If this creature isn't monstrous, put three +1/+1 counters on it and it becomes monstrous.) When Beorn becomes monstrous, you may have him fight target creature you don't control.
"If you must know more, his name is Beorn. He is very strong, and he is a skin-changer."