Bone Harvester

Bone Harvester cannot be sacrificed.
{3}: At random, put a Bone counter on a non-skeleton creature without a bone counter on it that you control and one you don't control.
{t}, Exile 50 Skeletons you control: Gain 50 life.
Whenever a creature with a bone counter on it dies, create a token copy of it, but it is a 1/1 black nonlegendary Skeleton creature token with "This creature can't be sacrificed".
"How very humerous..."