Glixgrad, the Flesh-Render

At the beginning of your end step, destroy target
non-Skeleton creature and create a 1/1 Skeleton creature token with Haste. Put a +1/+1 counter
on Glixgrad, the Flesh-Render.
Glixgrad, the Flesh-Render's power and
toughness are each equal to the number of
non-Skeleton creatures on the battlefield.