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

What can be in your sideboard?

Sideboards can contain 1 character card of 20 stars or fewer and up to 10 battle cards.
• No more than 3 copies of each Battle Card are allowed between a player's deck and sideboard.
• Duplicate character cards are not allowed between players' decks and sideboards.
• After sideboarding, decks must be legal.
Source: Wizards of the Coast (2019-11-21)    【Link to Ruling】
Tags: Sideboarding