Congrats on getting a
nymph!! She is my favorite one too!
I wouldn't consider myself very experienced, I'm practically a noob, but I will share my thoughts.
As a fighter: I completely agree with you. After the patch, I took my nymph out because of her nerfed attack powers. But thankfully, I realized that her strengths lie in other places, and put her back in. She buffs your shield, allows you to play dragons faster, heals you for lots of health, and makes gods with rain of fire playable.
As a restorer: the AI always lobos dragons with "light" before your nymph. What I usually do against gods with lobotomizers is fractal my nymph and play 2 or 3 of them together. The AI will lobo one of them, but after you use her ability, the AI will focus the lobo on any dragons/nymphs with "light".
As an Accelerator of light (shield) generation: She isn't super helpful, but she is indispensable in fortifying your shield. Would you rather have a 12-13 hope shield or a 21 point shield? Another side effect of this is that the nymphs basically pay for themselves by giving your dragons "light." If you have 6 dragons with light, that is basically two extra uses of the nymphs' ability per turn FOR FREE! That leads into her next use, healing.
As a healer, the light nymph is absolutely AWESOME!!! If you can get your hope shield up in time, you can handle tons of poison/momentum damage without breaking a sweat. After using fractal on your nymph, you can have 30+ healing per turn. Thats like 6 SoG's for basically no upkeep (because of your Rol's/dragons).
Overall don't be afraid of momentum/poison decks if you have a nymph, because her healing nullifies those decks. Also, rain of fire is less annoying if you can get some 'lighted' dragons out in time.
Not to hijack this thread or anything, but here is my current deck with a light nymph. It is basically the same deck as the original above.
5lk 5lk 5lk 5lk 622 622 7jp 7jp 7jp 7jp 7jp 7jp 7jq 7jq 7kc 808 808 808 808 808 80e 80e 80e 80i 80i 80i 80i 81q 81q 81q 81q
I hope that I've been able to help!