Nepherosis, Dusk Pharaoh

When you cast Nepherosis, you may sacrifice any number of creatures you control.
Nepherosis costs {1} less for each creature
sacrificed this way.
You may cast Nepherosis from your graveyard.
At the beginning of each end step, create a
number of 2/2 black zombie creature tokens with
decayed for each nontoken creature that died this
turn.
"You will serve me as your ancestors did, and you
shall do so alongside them."