Animated Necropsy

Extort (Whenever you cast a spell, you may pay {w/b}. If you do, each opponent loses 1 life and you
gain that much life.)
Whenever a nontoken creature you control dies, investigate. (Create a Clue token. It's an artifact
with "2, Sacrifice this artifact: Draw a card.")
Whenever you sacrifice a Clue, create a 1/1 white
and black Zombie creature token.
—
The way is shut. It was made by those who are
Dead, and the Dead keep it.