Bringer of Harmony

Altered (This spell must be cast using void mana)
Flying
Empty {w} (You may cast this card for its empty cost. If you do, exile it as it resolves. During your precombat main phase, if an opponent cast no spells last turn, you may cast the exiled card without paying its mana cost. Empty only as a sorcery.)
When Bringer of Harmony enters the battlefield, you gain 4 life.