When you cast this spell and whenever Emrakul, Imperative Eternities attacks, exile all cards from target opponents hand. You may play lands and cast spells from among the exiled cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any color to cast it. Return those cards to their owners hands at the begining of the next endstep.

Flying, trample, protection from spells that are two or more colors