Fury Totem Berserker

Whenever a creature you control takes damage, put a rage counter on Fury Totem Berserker.
Fury Totem Berserker gets +1/+0 for every rage counter on it. As long as there are five or more rage counters on Fury Totem Berserker it has first strike. As long as there are ten or more rage counters on Fury Totem Berserker it has trample.
Fury like his hath no bounds stopped by mere men.