Saracek, King of Bones

Eminence - As long as Saracek, King of Bones is
in the command zone or on the battlefield, all Skeleton cards in your graveyard have "You may
cast this spell from your graveyard as long as you control another skeleton."
Saracek, King of Bones gets +1/+1 for every
Skeleton you control.
Sacrifice a Skeleton: Saracek, King of Bones
gains Indestructible until end of turn.