Board Thread:Dragon City Breeding Questions/@comment-7950749-20130408092553/@comment-3271569-20130421200832

Soccer is listed into dificulty 1 so for the highest chance to obtain one you have to make sure you rating is between 95-99 for the best results.

The recently updated Breeding/Combinations explanes the combination:

In order to breed a soccer you have to make sure the element is not listed as primary element from the first parent. For example a volcano as first parent will never ever result a cool fire or soccer because the breeding system will fault on opposites in the primary sector. Here's the formule: (X=Flame Y=Ice; ?=Random element that are not X or Y)
 * ?/X vs Y (chance on soccer)
 * ?/X vs ?/Y (chance on soccer)
 * ?/Y vs X (chance on soccer)
 * ?/Y vs ?/X (chance on soccer)