Mirakep, the Prophet of Desire

Flying, dreamforge
{w}{u}{b}{r}{g}, Tap five untapped Wizards you control: Search a library for a card and exile it. You may cast that card, as long as it remains exiled, without paying its mana cost.
When Mirakep, the Prophet of Desire dies, exile it, return it to the battlefield at the beginning of the next upkeep.