Duel to go to Worlds or get lots of free in game stuff.
Duel Regularly for Gems, Sleeves, a new Mat and apparently Special Packs with old event cards you may not have.
The Sleeves and Mat are of Blue-Eyes Ultimate Dragon because of course they are.
Keep Dueling to get to Duel Max which lets you fight in the proper WCS challenge events that actually get you to worlds.
