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You can manage & track your card collection and decks once you create an account and login.
The card under Sergeant Barricade is basically out of play for a bit (at least, until you play it using the alt mode ability). While the card is under Sergeant Barricade, its not considered on the battlefield, even if thats where it is physically, so none of its abilities apply. If the card is an Upgrade, that Upgrade isnt on Sergeant Barricade, and so on. Its also not in your scrap pile, so it wont be shuffled into your deck when its empty.