It counts as a newly played copy of the mimiced card. When you buy the Mimic card, place the matching token on a keep card another player has played. You now count as having a duplicate copy of that card, as if it had just been played. If the card you are duplicating is discarded for any reason, you take the mimic token back. At the start of your turn you may spend 1 Energy to move the mimic token to any keep card in play.