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You can manage & track your card collection and decks once you create an account and login.

What happens if an Upgrade can’t be put on the other character? For example, say I have an Upgrade that says "Put on Cars only" and the other character isn’t a Car?

If an Upgrade can’t be put on the other character, it stays where it is. If the other character has an Upgrade of the same type, that Upgrade also stays where it is.
Source: Wizards of the Coast (2018-10-11)    【Link to Ruling】
Tags: Swap Parts