Its not really a mutation , its a mutation colour which means just a colour that mutations can have. They spawn with these colours and if you are lucky enough , you can find the parents egg with the exact colour and lvl. I am so wanting a full white drake or yellow one. I got red ( not the event one red ) and magenta drakes . Its another good thing to make people find different goals ingame at least for me! I want to have pretty , cool coloured drakes for sure since drakes are my current obssession.