Why did you upgrade 2 Light Nymphs? They are more usable unupped in forum events.
Because when I upped them I has no intention of doing forum events. Also, they are significantly better upped than unupped in my experience, I kept dying because I didn't have enough quanta to heal in arena, or missing EM's. Tbh, I don't regret my decision, I had more fun playing them upped anyway, they look cooler.
Edit: also, in war players are aloud to use at least 6 upgraded cards. If I was going to use a light nymph in my war deck, I would usually want to use the upped version over most other options aside from maybe pillars. As more pvp events, I am sorta outa luck unfortunately, but oh well, I should hopefully be able to get those back eventually, and I always have one extra if I need it.