Gudduruk, Death Shaman

+1: Create a 1/1 black zombie creature token with deathtouch. You lose 1 life.
-6: You gain 13 life. If Gudduruk, Death Shaman were to gain loyalty counters, he gains twice as many loyalty counters instead.
-20: Target opponent loses all of their life. Draw a card, then sacrifice Gudduruk, Death Shaman.