Plato

When Plato enters the battlefield you may search your library for a Class creature card, put
it into your hand, then shuffle your library. If
you do, you may return target blue creature to its owner's hand.
{w}{u}{b}{r}{g}, {t}: If you control three creatures named Guardian, Auxiliary and Craftsman you win the game.
"Human behavior flows from three main sources: desire, emotion, and knowledge."