Azarek, Chaotic Mentor

As you cast Azarek, Chaotic Mentor, search your library for a card, put that card into your
graveyard, shuffle your library, and lose 3 life.
Whenever a card leaves your graveyard, you may
pay {1}{b}. If you do, look at the top card of your
library. You may play that card until the end of
the turn. If you cast a spell this way, pay life
equal to its converted mana cost rather than
pay its mana cost.