What is the maximum Decks that I can build? Jennifer March 16, 2022 21:33 20 is the maximum number of Decks that you can build at one time. Related articles I’m new to Yu-Gi-Oh! MASTER DUEL. How should we start the game? What is the recommended specifications to play the game? How can I delete my Save Data? Can I transfer my data to other platforms? Could you inform us of upcoming maintenance schedules? Comments 0 comments Please sign in to leave a comment.