I just had a random thought... is Jaden the only protagonist in Yugioh to integrate cards from most of his friends into his deck? Whether it's for just a short period or for a while
I remember when he gave Chumley the Master of Oz, probably one of my favorite episodes because Chumley's deck is one of the most underrated decks in the franchise IMO
In Duelist Kingdom you had the shadow duel between Yugi and Bakura where Yugi incorporated the favorite cards of his friends in his deck, with Joey as Flame swordsman, Tristan as Cyber commander and Téa as Magician of Faith.