Himen, Heavens Scholar

Whenever you cast a spell, you may look at the top card of your library and choose to exile it. If you exile the card, gain life equal to it's converted mana cost.
{3}{w}{w}{t}: You may cast a card exiled by Himen, Heavens Scholar without paying it's mana cost.
"I've been in all the worlds greatest libraries. I will use my studies to their fullest benefits."