Bloodthirsty Werewolf

Haste, Lifelink, Trample

On your upkeep, if a creature an opponent controls
died last turn, put a +1/+1 counter on Bloodthirsty
Werewolf.

{1}{b/g}, Sacrifice a creature: Bloodthirsty Werewolf
gets +2/+1 until end of turn.

And the investigator transformed and unleashed
his werewolf fury.