Pit of Ashes

If a non-token creature you control would be sent
to the graveyard, exile it instead to Pit of Ashes.
{x}, Sacrifice Pit of Ashes: Return {x} creatures of
your choice exiled to Pit of Ashes to the battlefield;
they are Undead in addition to their normal
creature type.
If Pit of Ashes leaves play with exiled creatures,
send them to the graveyard.