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

Please explain the general rules on the battle cards with stars on the bottom? If you already have a 25-character deck, can you still put them in your deck for pip purposes and/or play them? Why is there a star on the bottom? Or do you have to have extra stars available to even put it into your battle deck?

You have to have extra stars available to put star battle cards in your battle deck.
Source: Wizards of the Coast (2019-03-08)    【Link to Ruling】
Tags: Star