Persistent Skaab

Unearth {0} (Return this card from your graveyard to
the battlefield. It gains haste. Exile it at the beginning
of the next end step or if it would leave the battlefield.
Unearth only as a sorcery.)
{1}{w/b}: Put Persistent Skaab on top of your
graveyard. Only activate this ability if Persistent
Skaab is in Exile.