Before XMAS (Bring 'Em Back...now ended) you could only breed Light Rift Dragons if you had two and was looking for a third. The same was obviusly the case for Dark Rifts. Does the inclusion of the Dark Elememnt to the Light Rift Dragon not suggest that it could now be bred from a Dark & Light Rift Combo? The sandbox currently suggests not: http://www.2084.org/dragonvale/breeding-sandbox/?1=dark-rift&2=light-rift. Any ideas?