Kir'Sh'Ana, Decaying Homeworld

When Kir'Sh'Ana enters the battlefield pay {1} or sacrifice it.
{t}: Add {c}{b} to your mana pool.
{7}{b}{b}{t}, Sacrifice Kir'Sh'Ana, Decaying
Homeworld: Return all creatures from all
graveyards to the battlefield under your control,
each creature returned this way is a Mutant
Xzzx Zombie in addition to it's other types.