Bad To The Bone

Indestructible, if you do not control any white
creatures.
All skeletons you control gain +1/+0.
Whenever a non-artifact creature you control
goes to the graveyard, you must put a 1/1
creature token into play. This creature token
counts as a black skeleton warrior, and comes
into play tapped.
"Your soul stays with me,
until your debt is paid."