Slifer's Disciple

When Slifer's Disciple is summoned, you
can pay an extra {r}{g} or {r/g}.
If you paid {r}{g}, summon up to three
Slifer's Disciple from your library or hand tapped on your side of the Battlefield.
If you paid {r/g}, summon up to one Slifer's Disciple from your library or hand tapped
on your side of the Battlefield.