Nathan, Pokemon Master

+3: Look at the top six cards of your library. Put up to one creature with mana value less than or equal to Nathan's loyalty onto the battlefield.
-X: Search your library for a creature card with mana value X and put it into your hand. Then shuffle your library.
-8: Create Mewtwo, a legendary 20/20 blue and red Pokemon creature token with flying, indestructible, and menace.