Blue Moon Dragon

Breeding
The, like the Moon Dragon, can be bred by using a combination that contains the lightning and the cold elements at the Breeding Cave/Epic Breeding Islandit can also be breed by breeding another expired dragon with a blue moon even though the blue moon is expired

Reported pairs can be seen on the Sun/Moon tab of the Epic Dragon Breeding Charts page.  EXPIRED 

Earning Rates
Coin per minute: Level 1: 48 / Level 10: 316

Dragon Earning Rates without boosts.

Boost Calculation Guide to use with the page linked above.