Rule 103.3.b

Your Main Deck can include up to 3 copies of the same named card.

• 103.3.b.1 This includes your Chosen Champion. Example: A deck could include Volibear, Furious as its Chosen Champion and still…
• 103.3.b.2 Cards have different names even if they represent the same character. Example: A deck could include 3 copies of Yasuo…

Official Core Rules