Kengchi, Mystic Songstress

When Kengchi, Mystic Songstress enters the battlefield, look at the top five cards of your library. You may reveal a Saga card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
{2}: Exile target Saga card from your graveyard.
You may cast cards exiled with Kengchi, Mystic Songstress.