gravedigger face-snatching

when I enter the battlefield, return target
creature card from your graveyard to your hand.
when face-stripping attacks you can mill 2 cards.
exile 3 creatures from your graveyard, you can
cast an instant or sorcery card from your
graveyard by exiling it.
exile 5 creature cards from your graveyard,
face-snatching becomes a copy of target
creature you control it stays with all your
abilities and also gains all creature abilities you
gain 3 madness counters.