Plumb the Forbidden

As an additional cost to cast this spell, you may sacrifice one or more creatures. When you do,
copy this spell for each creature sacrificed this way.
You draw a card and you lose 1 life.
The Tome of Fates tells the past, present and
future of all but the user. It has driven many over
the brink of insanity, giving forbidden insight to
others, but gaining nothing for themselves.