Echoing Ruins

When Echoing Ruins enters the battlefield, exile an instant or sorcery card from your hand.
{t}, Pay 1 life: Add one mana of any color to your mana pool.
{t}, {p/b}, Sacrifice Echoing Ruins: You may cast
the exiled card without paying its mana cost. If it
were to be put in a graveyard this turn, exile it instead.