Beorn, the Skin-Changer

Trample, Flash
Beorn, the Skin Changer has +4/+4 as long as an opponent controls five or more creatures.
Whenever a creature dealt damage by Beorn, the Skin-Changer dies this turn, put a +1/+1 counter on Beorn, the Skin-Changer.
"If you must know more, his name is Beorn. He is very strong, and he is a skin-changer."