Doctor Faust

Ward {2}
Whenever Doctor Faust attacks, roll a d20.
[ 1 ] Lose 10 life.
[ 2 - 9 ] Draw a card.
[ 10 - 19 ] Exile the top 5 cards of your library,
you may play them until end of turn.
[ 20 ] Draw your entire library. Until end of the
turn whenever you discard a card, shuffle it back
into your library.