I would like to point out that this chart can be misinterpreted easily.
@SandyFistOfPG The mystic frag value only applies to one egg!
As soon as you breed more than one dragon with a breeding pair, your value declines.
Especially below Sapphire this is very common. For example you breed 2 gold legendaries at once with a breeding pair. So per egg, the mystic frag value would be 400 but since you breed 2 of them simultaniously the mystic frag value for that whole breed is actually 400/2 = 200!
Another factor that is often forgotten is builder hit / research eggs. The more mystic frags you use, the less additional eggs you get.
Make sure to get your builder hut eggs from a breed and once you got them, you can use mystic frags on the one dragon egg you want to finish. Red’s paths should show the amount of additional eggs you need.
Basically, mystic frags are one of the worst ideas ever implemented by PG and tricks players that don’t plan very carefully into wasting more tokens for additional builder hut and research eggs in the long run in my opinion.