Djinn Illuminatus

If you cast an instant or sorcery spell that has {X} in its mana cost, the value of X in the spell's replicate cost will be the same as the value of X you chose for its mana cost.

If you cast a spell that already has replicate while you have this creature on the battlefield, the spell will have two replicate abilities: one with a replicate cost as printed on it, and one with a replicate cost equal to its mana cost. (In this set, both costs are always the same.) You may use either ability, or both abilities, to replicate the spell.