Atlas

Atlas enters the battlefield tapped.
{t}: Add {w}, {u}, {b}, or {r} to your mana pool.
{2}{u}{r}, {t}: Search your library for an artifact card, reveal it and put it into your hand, shuffle your library.
{x}{w}{b}, {t}: Target artifact you control with a converted mana cost of X or less becomes an X/X artifact creature until end of turn.