Yuresh, Grave Deflier

{2}{b}{t}: Each player mills equal to the total
power among creatures they control.
{b}{g}{t}: Exile all graveyards. Each player creates
X 2/2 black zombie creatures where X is the
number of creatures exiled from their graveyard.
Create a black zombie mutant creature token
with power and toughness equal to the number
of zombies created this way.