I believe fortuity, but Destiny and the White Nymph slowly destroy my faith. Every time I faced Destiny in the last weak it got a White Nymph through a Fate Egg. I Kouraitious study about Probability "Revised - Fate Egg Statistics!" he gets a probability for a nymph by 16,7%. So your chance to get a White Nymph is 1,39%.
Either it's very random and I have seen just a great series or Destiny have some empathy with the White Nymph.
Do you believe that Destiny have a destiny for getting special cards?
(maybe you had done the same experience)
