Teras, Corrupter of Life

Reap {w}{b}{b} ({w}{b}{b}, you may exile target creature in your graveyard, then gain life equal to that creature's toughness.)
Whenever you reap a creature create two 1/1 white Spirit creature tokens, and target opponent sacrifices a creature.
When Teras, Corrupter of Life dies draw cards equal to the number of spirits you control.