Congratulations!
Congrats also t oMostreal!
I know that not everyone has a Feathered Dragon (Rainbow/Yellow), but I used it with diamond and got 2 Frilly dragons. If you have a Rainbow/yellow dragon, you might want to try it with a diamond dragon as long as you are ok with possibly getting a long fail.
One of my other accounts got it with Rainbow and Yellow, first try. Other 2 accounts will continue to try. If they don't get it, c'est la vie'.