Ugin, Student of Eternity

If mana of any color was used to cast this spell it cost {3} more to cast. When Ugin, Student of Eternity enters the battlefield you may cast a face up historic or colorless spell from exile without paying it's mana cost.
{w}{u}{b}{r}{g}: exile another target non-land permanent and return Ugin, Student of Eternity from the battlefield to owner's hand