422.2. If a player chooses to do this, all such sleeves must be identical and all cards in a deck must be placed in sleeves in the same manner. Cards in decks must have the same number of layers and be the same orientation at all times.
422.2.a. It’s suggested but not required that players use different sleeves for the different decks (Main, Rune).
422.2.b. Players may use a unique sleeve or additional layer to distinguish their Chosen Champion during game setup, but must change its sleeve to match their Main Deck if it would enter a zone whose information level is private during gameplay. See CR 127 Privacy for information types.