Well of a Thousand Futures

Whenever you cast a spell with cascade from
your hand, it gains 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.)
{1}{g}{u}{r}, Discard a card at random: The next
spell you cast from your hand this turn gains
cascade if it doesn't have cascade.