Hialnor, Waktet's Legacy

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 of your library in a random order.)
At the beginning of your upkeep, if you cast a
spell from your hand during your last turn, exile Hialnor, Waktet's Legacy, then cast it from exile without paying its mana cost. If not, scry 2.