Redox, Dragon Ruler of Boulder

If this card is exiled, you may search your library for 1 green dragon creature card and place it in your hand.
{2}{g}: Cast this card as a sorcery, discard this card and 1 green creature card, place one creature card in your graveyard onto the battlefield, except this card.
You cannot cast this card as a creature spell or use its ability this turn.
You may exile 2 green or dragon creature cards from your hand or