Echoing Wardship

When Echoing Wardship enters the battlefield,
exile a green creature card from your hand.
As long as you control no other creatures,
Echoing Wardship is a copy of the last card exiled
by it except its name is "Echoing Wardship" and
its a Spirit in addition to its other types.
When Echoing Wardship is put into your
graveyard from the battlefield, put it into your
library third from the top.