Sisters of the Tainted

Ritual 3 —Whenever this creature enters the battlefield, sacrifice any number of nontoken creatures, for each creature sacrificed this way,
each opponent loses 3 life.
When a creature you control dies, you may put
the top card of your library into your graveyard,
if a creature is put into the graveyard this way,
create a 1/1 black Vampire creature token with deathtouch.