Merret, Dimir Mind-Mage

When Merret, Dimir Mind-Mage enters the battlefield, Surveil 3. (Look at the top three cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
Whenever you surveil, you may pay {b}, if you do, you may look at an additional two cards.
Merret's power and toughness are equal to the number of cards in your graveyard.