I'm having the same issue. The decks appear to be invalid and after editing the deck the same network error appears not allowing you to save. For some reason the white deck for me is the only valid and working deck. I completed the main color challenge and was working on the quests for the extra decks and I can't use white for this quest and it's the only color that works, so I can't progress any further.
I'm having the same issue. The decks appear to be invalid and after editing the deck the same network error appears not allowing you to save. For some reason the white deck for me is the only valid and working deck. I completed the main color challenge and was working on the quests for the extra decks and I can't use white for this quest and it's the only color that works, so I can't progress any further.