Nira, Brood Sister

When you cast Nira, Brood Sister, reveal the top five cards of your library. You may choose up to two noncreature cards from among them and put them on the bottom of your library in any order.
Cascade, cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order. Then do it again.)