Skull Knight

Flash, persist (When this permanent is put into a graveyard from the battlefield, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
When Skull Knight enter the battlefield, you
may destroy target creature with 3 or less power.
To take a step into this world, outside of both the world of living and the world of the dead... you must be either very brave or mad.