Raitoningu, Storm Cauldron

Raitoningu, Storm Cauldron enters the
Battlefield tapped unless you discard a red card.
{t}: Add {r}.
{3}{r}{r}{t}, Exile Raitoningu, Storm Cauldron:
Search your library for a red Artifact or Sorcery
card with converted mana cost 3 or less, reveal it
and put it into your hand. Then shuffle your
library