Boseiju, Lantern-Lit

{t}, Pay 3 life: Add {u} or {r} to your mana pool.
Whenever Boseiju, Lantern-Lit is tapped for mana, put a Lantern counter on it. Instant and sorcery spells you cast cost {1} less to cast for every Lantern counter on Boseiju, Lantern-Lit.