Goblin Alchemist

{u/r}, {t}: Exile an instant or sorcery card from your hand.
{x}{u}{r}, {t}: Choose target instant or sorcery card with converted mana cost X exiled with Goblin Alchemist. You may cast that card this turn. If you do, choose another target instant or sorcery card exiled with Goblin Alchemist, and add its effects to that spell.