jerry, skelton king

-7: create X black 1/1 skeletons where x is the amount of skeletons on the battlefield
+1: destroy target creature then either create 10 1/1 or summon 1 (create 1 black skeleton every tap step [can stack])
-9: summon X (create X black 1/1 skeletons every tap step [can stack]) where X is the number of cards in every player's graveyard.