Progressive Binding

I: Opponents can't cast instants or sorceries for
as long as you control this saga.
II: Opponents can't cast non-creature artifact or enchantment spells for as long as you control this
saga.
III: Opponents can't cast non-creature spells for
as long as you control this saga.
IV: Opponents can't cast spells for as long as you control this saga.
V: You can't cast spells this turn. Opponents
may cast spells as though they had flash this turn.