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You can manage & track your card collection and decks once you create an account and login.
Yes. After the battle, Grenade Launcher will see that the character it’s upgrading has attacked and its ability will make you scrap it. Similarly, if a character that has a Grenade Launcher attacks, but somehow no longer has that Grenade Launcher after the battle (say, because a Swap Parts put it on a different character), Grenade Launcher won’t be scrapped.