Grimmy Greefus the Relentless

Grimmy Greefus the Relentless attacks each
combat, whether or not he is able to. (He attacks
on each players combat step whether or not he is
untapped, and ignores cards that prevent him from attacking)
If Grimmy would die, instead exile it with a
revenge counter on it. At the beginning of the
next combat step, return Grimmy Greefus to
your hand.