Tempest, Dragon Ruler of Storm

If this card is exiled, you may search your library for 1 white dragon creature card and place it in your hand.
{2}{w}: Cast this card as a sorcery, discard this card and 1 white creature card, search your library for 1 dragon creature card and place it in your hand. You cannot cast this card as a creature spell or use this its ability this turn.
You may exile 2 white or dragon creature cards from your hand or graveyard to cast t