The Ghoul-King's Tomb

Hexproof
{t}: Create a 2/2 Black Zombie creature token.
When The Ghoul-King's Tomb enters the
graveyard from play, search your library
and/or graveyard for a Ghoul-King
Planeswalker and cast it without paying its
mana cost. Shuffle your library afterward.
Its presence both warps the land and keeps it safe
from even worse.