A login campaign has been announced for Master Duel to commemorate the WCS. By logging in between August 19th, 13 JST to October 5th, 23:59 JST, you can obtain the following rewards:
Day 1: 1 Pack Ticket (Pack Unknown)
Day 2: Blue-Eyes Ultimate Dragon (UR Royal Finish) (Alternative Artwork)
Day 3: 1 Pack Ticket (Pack Unknown)
Day 4: Polymerization (N) (Alternative Artwork)
Day 5: 1 Pack Ticket (Pack Unknown)

These are the artworks used for the 2026 World Championship attendance promo cards.

Source.