Gressop, Death Shifter

Whenever another permanent is put into a graveyard from the battlefield, you may exile Gressop and return it to the battlefield as a copy
of that permanent. Its name is Gressop, Death Shifter, it's a legendary zombie in addition to its other types, and it gains this ability.
After decay and rot left its body a mass of quivering mold and pus, the magic that kept it "alive" took form in the shape of those that died around it.