Every year since 2004 (except for 2020 & 2021), world championships are held to determine an overall winner broken down into a number of divisions. The winners of three divisions plus one runner up has their deck released as a World Championship deck. It has the back that you refer to and the winner's signature on the front of the cards.
In 2019, these four winners were...
Haruki Miyamoto, the Juniors Division champion - Pikarom Judge set
Kaya Lichtleitner, the Senior Division champion - Fire Box set
Henry Brand, the Masters Division champion - Perfection set
Shintaro Ito, the runner-up in the Masters Division - Mind Blown set
I have now added this four sets. Please let me know if there are any questions.
Thanks, Brian
I am one of the members that helps within the site. I work closely with the IRs and can answer most questions. Please send me a message if there is anything I can assist with. If I don't know, I can certainly try to figure it out or direct you to a resource.