The Crow Man

You may exile The crow Man if you do, Create
four 1/1 flying Crow creature tokens onto the
battlefield (you may do this at instant speed)
You may Sacrifice four Crow creature tokens
if you do take The Crow Man out of exile and
onto the battlefield with a -1/-1 counter on it
Whenever a creature you control becomes the
target of a spell or ability create one 1/1 crow
Creature token