A number of cards are banned for using rules that do not apply to modern Magic, like Ante or Conspiracy mechanics, while others are banned across all formats for being culturally insensitive
(1998) The first anime adaptation of the "Yu-Gi-Oh!" manga came out in 1998, and if you only discovered the franchise on 4Kids, you may not even know about this earlier version
65 card sleeves featuring Koraidon or Miraidon
In a 40-life format like Commander, they won't care
The long-term value trajectory of a UPC is almost entirely anchored to the desirability and condition of its exclusive promotional cards
A card slabbed by PSA, CGC, or BGS has already been checked and authenticated, which removes much of the guesswork at the cost of a higher price