Eleanor, Graceful Flower

Instants you cast have Cascade (When you cast this spell, exile cards from the top of your library until you
exile a nonland card whose converted mana cost is less
than this spell's converted mana cost. You may cast
that card without paying its mana cost. Then put
all cards exiled this way that weren't cast on the
bottom of your library in a random order. )
At the beggining of your end step, if you have
exiled seven or more card this turn, transform Eleanor, Graceful Flower