Rule 103.2.d

Your deck may only contain 3 total Signature cards that have the same Champion tag as your Champion Legend.

• 103.2.d.1 Regardless of name, a deck may only contain a sum total of 3 Signature cards.
• 103.2.d.2 All of the Signature cards must have the Champion tag that corresponds to the Champion Legend of the deck.
• 103.2.d.3 Signature cards are not Champion units and cannot be placed in the Champion Zone.

Official Core Rules