Obelisk's Disciple

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