Nrezeim, the Silent Dread

Whenever a creature you control dies, you may
pay twice X life and draw X cards where X is that creature's power.
Sacrifice another nontoken creature: Create a 2/2
black zombie creature token.
Sacrfice two other creatures: Return target
creature card from your graveyard to the battlefield.
{b}{b}, {t}: Discard your hand, search your library
for a card and put it into your graveyard then
shuffle your library.