Walking Boneyard

Walking Boneyard enters the battlefield with a
number of +1/+1 counters on it equal to the
number of creature cards in all graveyards.
If damage would be dealt to Walking Boneyard,
remove a +1/+1 counter from it and create
a 1/1 black Skeleton creature token with
"{b}: Regenerate this creature" instead.
Few and unfortunate are the travelers where darkness creeps and the rattling of bones fills the air.