Liliana, death marcher

+2: sacrifice a creature, create a 4/4 zombie worrier creature token with vigilance and when this creature dies each opponent loses 1 life.
-4: sacrifice three zombie tokens, put six loyalty counters on Liliana. amass 1 and each opponent discards a card.
-12: destroy all creatures, your opponents dying creature effects do not trigger and yours trigger an additional time. liliana cannot be your comman