Darius, the Technomage

If Darius is untapped, instant and sorcery spells
you cast cost {1} less to cast. If Darius is tapped,
artifact spells you cast cost {1} less to cast.
{t}: Look at the top five cards of your library.
You may exile an artifact card from among those
cards. You may cast that card as long as it
remains exiled. Put the rest on the top or
bottom of your library as you choose.