Allure of the Ungiven

Altered (This spell must be cast using void mana)
Empty {r} (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.)
Exile target creature. Its controller gains 4 life.
"Sometimes only the brave deny assistance."