Mendel, the Undercleric

+1: Target creature gets -X/-X until end of turn, where X is the number of creature cards in its controller's graveyard. You gain X life.
-4: Each opponent may exile a creature card from their graveyard. For each opponent who doesn't, put a +1/+1 counter on each creature you control.
-10: Exile all cards from your opponents' graveyards. You gain life and create a number of 1/1 green Insect creature tokens equal to the cards exiled.