I just thought of a cool "format"(i think idk) that will mostly only work for online play of yugioh but what if instead of usual, you had to make one with card available to both party. What do i mean by this? out of all the cards that exist(maybe with the usual ban list but could be cool to see with very few ban list) some of them are available(I wanna say 50% of the total cards can be used at random although this can be changed) to add to your deck and the opponent also had the same cards available. You would not know what cards are available until the event starts and you have maybe an hour to make a deck from the selected cards. This could be a terrible idea but I think it would be a lot of run to play it