Since not all details are confirmed let us know information you get by submitting comment or screenshot in a thread at the bottom of the page
You need to enter the Card Studio to change card sleeves and game mat. The facility is also used to edit deck.
When visit the studio, you will see the menu, then choose Customization to see available accessories and to use them.
Only acquired card sleeves and game mat are displayed. Select the one to make your duel field cool.
How to beat/farm Yami Marik (Part 2) Lvl 40
PvP Best decks [November]
Yami Marik event part 2: Unleash the Egyptian God Card!
King of Games decks [December 2017]
How to beat/farm Yami Marik (part 2) lvl50
Cyber Angel: deck recipe
The Winged Dragon of Ra: deck recipe
Parasite Infestation Ver 2.0: deck recipe
Decks to farm LDs
Union Attack | Decks and Tips
Gravekeeper's Vassal | Decks and Tips
Spirit Barrier | Decks and Ruling
Anti-Magic Arrows | Decks and Ruling
Cyber Angel Dakini | Decks and Ruling