Faust, Medical Genius

When Faust enters the battlefield, reveal the top
card of your library. You may exile a card from
your hand with mana value equal to the mana
value of the card revealed this way, if you do you
may cast the revealed card without paying its
mana cost.
{x}{x}{u}{u}{t}: Draw X cards then discard X cards.
You gain life equal to the number of nonland
cards drawn this way and opponents lose life
equal to the number of nonland cards discarded
this way.