Portal to the dammed

{3}{p/b}{t} sacrifice a creature: Return target
creature from your graveyard to the battlefield
under your control, it is a zombie and a skeleton
in addition to its other types.
{6}{b}{p/b}{t} sacrifice a creature: Search your library
for a creature card and put it into your graveyard,
then return a creature from your graveyard to
the battlefield under your control, it is a zombie
and a skeleton in addition to its other types.