Moonbreaker Rider

Trample, enforce (This creature's power and
toughness can't be reduced by spells and abilities you
don't control and it can't be destroyed by lethal
damage unless lethal damage dealt by a single source
is marked on it.)
At the end of combat on your turn, put a +1/+1 counter on this creature for each creature you
control that dealt combat damage to an opponent
this turn.