Ruler of the Falls

Flying
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 of your library in a random order. Then do it
again.)
When Ruler of the Falls enters the battlefield,
you may tap or untap target creature without
flying.