Tzukur, Undying Hate

Whenever one or more cards are put into your
graveyard from anywhere, each opponent loses
1 life.
Whenever you cast a creature or sorcery spell,
you may pay {1}. If you do, mill a card and then
create a 1/1 black and green Skeleton creature
token.
Other Skeletons and Zombies you control have lifelink.