When I was in 7th grade I played Yu-gi-oh at school. I would duel other people and trade. I played Yu-gi-oh tell I was in 9th grade. I still have my cards just cause I never really wanted to give them up.
But I had like 3 major decks that would easily beat people.
One was like a dragon deck, the other was the magic deck with The Dark magician and The Dark Magician Girl, which had every single card in it a super rare or the rarest card. And the Last deck I had, had all the Exodia pieces to it.

@ Ksrocks333 What are some of the best Yu-Gi-Oh cards do you have? Please pm and we might make a deal