Beseech the Unknown

If {p/u}{p/r} was paid with life, Creatures you control have Shroud.
At the beginning of your draw step, instead of drawing a card, look at the top card of your library. If it's an Instant, Sorcery or Aura card, You may play it without paying its mana cost. Otherwise, put it into your hand.
Whenever you cast an Instant, Sorcery or Aura card, you lose 1 life.