Niv-mizzet, the last izzet

Flying
Whenever you cast an instant or sorcery card, look
at the top 2 cards of your libary, you may reveal a instant or sorcery card, if you do you may cast that spell for {2}{r}{u}
If you cast 3 or more instants or sorcery cards
on your turn, they become creatures with base
toughness and power 2/2.