It is said that the Rainbow dragon is the rarest dragon of them all, so consider it a big fete when you get one!
Here are some of the best options to get a Rainbow:
Firefly + Seaweed
Blue Fire + Crystal
Lava + Seaweed
Evergreen + Firework
Blazing + IcebergIncubation time for the Rainbow is 48 hours.
Description of the Rainbow dragon:
Normal words cannot begin to describe the resplendence of these, rarest of all dragons. The first person to ever witness one stared for hours before running home to send a poet to describe the beast. When the poet arrived, the dragon had left without a trace, leading many to believe that the explorer made up the whole story. Only years later do we now realize that he wasn't crazy at all!