The Necrobinder

When The Necrobinder enters and at the beginning of your upkeep, if you don’t control a creature named Osty, create Osty, a legendary 1/1 black Skeleton creature token. Otherwise, put a +1/+1 counter on Osty. Sacrifice another Skeleton: Prevent the next X damage that would be dealt to you, where X is the sacrificed creature’s toughness.{/fontsize-15}