Make a copy of your FM BIN/CUE files that you want to mod and rename them both something relevant (make sure that they are both named the same thing with the file names intact)
Switch, Great Ball, Pokmon Catcher, and one or two other trainer cards are still legal because they have been reprinted with F, G, or H regulation marks, so even though you are not playing the new version of the card, it has the same effect as the old one, so old editions of standard legal cards are legal for the standard format
If theres some win condition that comes after that, were good with it
In the opening turns, add [BT17-100 Doomsday Clock] cards to your hand while breeding your Digimon and digivolving them into [Diaboromon]
But remember that there are other game versions, and the rules may differ
Though there are still a couple more Support traps: Whenever you activate an effect that special summons a "Horror" Monster, decrease the attack and defense of all face-up Monsters by 100 until your next standby phase