Chishiro, Compleated Samurai

Spells you cast from exile cost {1} less to cast for each aura or equipment attached to this creature. Whenever you cast an instant or sorcery, you may pay {Pu}. If you do, search your library for an aura or equipment and exile it. {Pr}{Pr}: Choose a noncreature spell in exile. You may play that spell this turn. For each colored mana symbol in that spells mana cost, you may pay 2 life rather than pay that mana.