Anathema of the Dead Sand

+2: Creatures your opponents control get -0/-2 until your next upkeep.
-1: Exile a card from a graveyard, then create X 1/1 black skeleton creature tokens, where X is equal to the number of cards in exile.
-5: Exile all cards from all graveyards. Then, each opponent loses X life, where X is the number of creature cards in exile.