Zack, Deranged Scythemaster

Partner with Rachel, Solemn Stitchwraith.
At the beginning of your upkeep, you may
sacrifice a creature. If you don't, Zack deals
5 damage to you. Whenever a creature you
control is put into the graveyard, if it was
sacrificed to Zack, Deranged Scythemaster, put
a scythe counter on it.
{b}{p/b}{p/b}, Sacrifice a creature: Draw a card.