Board Thread:Dragon City Questions and Answers/@comment-92.53.59.123-20130527143421/@comment-1158461-20130601223738

The reason you can't breed a Soccer or CoolFire dragon every time is because it is a Rare Hybrid, obtained only by breeding opposing elements - the example Mrbj has provided offers the Fire and Ice opposition, the two types of the Soccer Dragon. Be prepared to have to sell some eggs, though.