Plague-skull Lich

When Plague-skull Lich enters the battlefield,
each player mills the top ten cards of each
library.
{b/g}{b/g} Exile a creature card from target
players graveyard: put a -1/-1 counter on
target creature, proliferate.
Whenever a nontoken creature with a -1/-1
counter on it dies, put a 2/2 black zombie
creature token.