Watch — :Remove a card in your opponent's scrapyard from the game. If it was a crew card, put a +1 firepower/+1 hull marker on this crew.
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Explained
Watch — :Remove a card in your opponent's scrapyard from the game. If it was a crew card, put a +1 firepower/+1 hull marker on this crew.501.6
Exhaust it to use it. You choose which when it happens, any card; with an empty scrapyard nothing happens. It is out of the game for good (403.4). A +1 firepower/+1 hull marker gives this crew 1 more firepower and 1 more hull; several add up, and it loses them when it leaves the board (301.7e). Only in your own watch, with the crossfire empty; it resolves at once. Not in the turn it came on board during a watch, unless it has Quickstart.