The Wolfman

At the beginning of each upkeep, if no spells were
cast last turn, you may have The Wolfman fight another target creature.
Whenever The Wolfman fights another creature,
put a +1/+1 counter on each surviving creature.
Each creature you control with a +1/+1 counter
on it is a Werewolf in addition to its other types.
Werewolves you control have Trample.