Jack, master of graveyards

{p/u}{p/b}{u/b}: target opponent mills a
card and discards a card
{p/g}{p/b}{b/g}: mill 1 card, draw 2 cards, discard a card
{5}: create x 1/1 zombies with decayed where x is the amount of creatures in graveyards or this creature becomes an x/x where x is the amount of non permanent cards in graveyards