Blackwell, Mad Void Scholar

When Blackwell enters the battlefield, you may
search your library for a card named "Azathoth,
Beast of the Void." and place it into your exile.
If you can't draw a card, if you do, discard a card.
If a creature was put into your graveyard this
way, create a 1/1 black rat creature token.
Shuffle your library
"His research must be an important errand in the
name of justice. Right?"
—Godwin II