If you are instructed to duplicate a tactic, an “invisible” copy of the tactic is created. This copy has all the rules text of the tactic it is duplicating, including any written costs (this does not include its cost number so you don’t have to pay it). The duplicate is considered to have been played as though it were a normal tactic (although the duplicate can't be responded to since you weren't following the instructions in “How to Play a Card". If you would be unable to play the tactic because of a restriction or if you are unable to satisfy all of its written costs then the duplicate is invalid and has no effect.