Kaine, Walker of Worlds

Flash
When Kaine, Walker of Worlds enters the battlefield, as your next spell is cast, it gains 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.)
"He is like a ghost. He goes whoosh..."