Reverse the Current

Spells you control with cascade lose cascade and
have flux. (When you cast a spell with flux, exile
cards from the top of your library until you exile a
nonland card that costs more. You may cast it
without paying its mana cost. Put the exiled
cards on the bottom of your library in a
random order.)
"Changing the flow of a single river is harmful enough
to destroy entire universes. And that's exactly why we
want to do it."