As I'm using the interface of oETG again, I remembered there is one thing that had bothered me since the beginning.
Please order the cards in alphabetical order. Someone said that it's fast to put together a deck, but that's not true when I have to search for every card name. As exceptions, you can still put Pillars and Pendulums to the top of the list, but it makes no sense that they are in the middle column and not in the left column.
(I think the current card order represents the order of introducing the cards, but that is pointless information.)