30 wings of discovery is a prize if you got 5 treasure chest in the chocobo race in remiem temple. you can also bribe malboro/great malboro. but i suggest you fight shinryuu. just do one attack reel (with 99999 dmg) and blitz ace. you get 2 wings of discovery for an overkill.

also i don't think you need break mp limit. i find no use to mp with yuna's nirvana.. in addition, you can cast three stars, this gives 0 mp usage for all the characters.