The Search for Xion

You can't have a second copy on board. Once you have claimed one, you can't launch another, make progress at your opponent's copy or claim it: it is scored only once.

If this card is in your scrapyard then, you may return it to your hand. It happens right after a dig puts it into your scrapyard, also a dig your opponent makes you do. Scrapped any other way, it stays there. In the sortie phase it goes into the crossfire first.

While this card is on board, every crew of its controller's opponent has 1 less firepower in every battle of the battle step, not only here. Firepower never goes below 0. An expedition's controller is the player who launched it. Once the expedition is claimed, it works from the logbook for the rest of the game, for the player who claimed it, whoever launched it: "you" is then the claimer (304.5a).

Crew dispatched here on their own turn make progress, whoever launched it; on the opponent's turn they can only fight (706.3a). The first player to reach 20 progress claims it and gains 5 spoils.