Malakeer, Bone Lord

Eminence - Whenever a Skeleton you control
becomes tapped due to Regenerate, you get an Experience counter.
Whenever a nontoken Skeleton creature you
control dies, create a 3/2 black Skeleton Warrior
creature token with "{b/g}{b/g}: Regenerate."
Skeletons you control get +X/+X. Where X is
half the number of Experience counters you have rounded up.