Knochen, Boneyard Savant

When Knochen, Boneyard Savant enters the battlefield, destroy all other creatures with power three or less, then, if at least three creatures you control are destroyed this way, create a 1/1 black Skeleton creature token for each creature destroyed this way.
{b}{g},{t}: Regenerate target Skeleton. Untap it at the beginning of the next end step. It gains deathtouch.