Silumgar, Sultai Usurper

Flying, Menace
Whenever a creature enters the battlefield under
your control, if it was cast, you may Exploit it.
Whenever you sacrifice a creature, you may
discard a card. If you do, draw a card, then search
your library for a basic land and put it onto the battlefield tapped, then shuffle your library.
Power held in the grasp of cruelty.