Board Thread:Dragon City Gameplay Questions & Answers/@comment-182.188.221.25-20130701130423/@comment-10760902-20130701140157

You can use any 2 of. The result is one of the legends dragon (including Wind Dragon). Because there is no way to get specific Wind Dragon

If you want to find out which combination has better odds (chance) to get legends. You can read it here User_blog:Nmtan/How_to_get_Cool_Fire%26Soccer