Sage of the Misty Mountains

Prowess, evolve
{3}, Discard a card: As you cast spells with converted mana cost 3 or greater this turn, they gain cascade. (When you cast the 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.)
"From one thing, know ten thousand things."