Keeper of the Scythe

Companion — You must have Unscythe, Killer
of Kings in your starting deck.
Undying
Zombie tokens you control have "{p/b}, Sacrifice
this creature: Return target card from your
graveyard to your hand."
You may cast creature cards exiled by Unscythe,
Killer of Kings. Spend mana as though it were
mana of any type to cast that creature. That
creature is a Black Zombie in addition to its
other colors and types.