Board Thread:Breeding Questions/@comment-11532724-20130811003348/@comment-14284922-20130811043046

A legend dragon is a wildcard, so there is no best strategy, you could just repeatably breed it with a terra dragon and hope for pure terra. (I just suggested terra cause it generally gives the smallest times when mixed with other elements).

Once you get the Pure Terra you can start using that for breeding. This isn't ideal, but should work.