Text (GP+errata): 3/5, Flying. ; Each instant and sorcery spell you cast has replicate. The replicate cost is equal to its mana cost. [Oracle 2009/07/08]
The (U/R) hybrid mana symbols can be paid with either {U} or {R}. [Card Reminder Text]
If a spell already had Replicate, it now has two different Replicate abilities and either or both may be used. [Guildpact FAQ 2005/12/22]
If a spell has an {X} in its mana cost, the Replicate cost will be the actual value of X you chose when playing the spell. [Guildpact FAQ 2005/12/22]
If a spell has no mana cost of any sort (not even {0}), then the replicate ability that is created will have no way to pay its cost. [D'Angelo 2006/11/11]