After you beat the game go to the Satalight lower section. You will see oficer Trudge and Yusei. Yusei's deck is Stardust Awakened, and in my opinion very hard to beat.

For the people who want to now is in the Tag Team Tournament you need to battle in the first round two people from the underground battles I think.
The second round you must battle bolt tanner and blister.
And in the finals you must battle with the twins Leo and Luna.
In the Fortune cup you must first battle with a guy in a golden armor and he has good cards but can't came along with it.
The next round you must battle with Akiza that is te girl you battled in the underground the one with the plants so be prepared because she has very good cards. And in the final you must battle with Yusei but that was very prodictable and then you must battle with jack atlas. Yusei is a Turbo duel and has many warriors so be prepared.
And jack I don't know because I am still busy with Yusei.
There is a tournament in the middle of the tournaments and then you must battle with some very easy opponents except the second because he is very annoying with his zombie's.