Grand Moff Tarkin

Whenever an opponent loses life, add {b} to your
mana pool. Then if your opponents have less life
than you, draw a card. Then if your opponents control less creatures than you, you gain 4 life.
At the beginning of your end step, if you
activated each of Grand Moff Tarkin's abilities
this turn, you may pay 5 life and sacrifice two creatures. If you do, target player loses 10 life.