King Myrrak, First of the Bone

Whenever a non-Skeleton creature is put into a graveyard from anywhere, create a 3/1 Skeleton creature token with menace.
{b}, Sacrifice a Skeleton: Each player mills three
cards.
{b}{g}, Sacrifice two Skeletons: Return King
Myrrak, First of the Bone from your graveyard
to the battlefield tapped.