Frostfire Dragon

Breeding
The can be bred by selecting a Cold Dragon to mate with a fire hybrid dragon at the Breeding Cave/Epic Breeding Island.

Alternately, breeding a Fire Dragon and a cold hybrid dragon might result in Blue Fire Dragon.

Earning Rate
Coin per minute: Level 1: 20 / Level 10: 130

Dragon Earning Rates without boosts.

Boost Calculation Guide to use with the page linked above.