Kenrith, king of skulls

{r}: deal 1 damage to any target, if a creature would die this way, its controller may create a 1/1 black skeleton creature token
{1}{g}: Regenerate target skeleton
{2}{w}: target player gains life equal to the number of skeletons you control
{3}{u}: target player draws cards equal to half the number of skeletons you control rounded down
{4}{b}: Put target creature card from a graveyard onto the battlefield under its owners control. if that creature is not a skeleton, you may put a 1/1 black skeleton