Whnthnkl, the Augur

Cascade, cascade, 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. Then do it two more times.)
Many say Whntnnkl's power is comparable to,
or even greater than that of Nicol Bolas.