Yu-Gi-Oh! I can copy my opponent's deck

Gu Tian traveled to the world of Yu-Gi-Oh! GX and gained the ability to copy his opponent's deck!
As long as you defeat your opponent, you can copy his deck!
"Judai, let's duel and show me your elemental hero deck!"
Elemental Hero Deck, Get It!
"Manjomu, your Armed Dragon deck isn't any good. If you don't believe me, let's have a fight."
Armed Dragon deck, obtained!
Even the copied deck can be upgraded!
The Elemental Hero deck is upgraded to a composite deck of Elemental Heroes, Phantom Heroes, and Masked Heroes!
The Armed Dragon deck is upgraded to the Armed Dragon Thunder deck!
There are also electronic dragon card decks, fossil card decks, etc. available!
Gu Tian’s goal is to become a master of card deck collection!