Yugi-oh! season zero was the original yugioh series aired in Japan, it didn't revolve around the card game but rather the characters, it's never been dubbed before(aside from fandub), and it never aired in America, but in my personal opinion as well as many of others' it was and is far better than yugioh aired in america was and is.

if you haven't seen it yet, you should probably check it out, you can find some episodes on Youtube still I believe.