Cant find or use Archenemy or Planechase cards?

[DragonCrystal]

Hello there, I recently just found out about the program Xmage and I'm still learning how to use this program fully but Im having a bit of trouble using the planechase cards, I cant find them nor see them anywhere except for when I choose it in tournament, am I doing something wrong? Also what does one do for the Archenemy cards or format? Please help thanks.