It That Is Intangible

{t}, Sacrifice It That Is Intangible: You gain 1 life.
As long as It That Is Intangible is in your graveyard, cards in your graveyard have, "Exile It That Is Intangible from your graveyard: Return this card from your graveyard to the battlefield tapped."
As long as It That Is Intangible is in exile, cards in exile have, "Return It That Is Intangible to the battlefield tapped: Put this card into your graveyard."