Events are a key part to War Dragons. Through events, you get the season sigils, which you can use to get the seasonal dragons. In my opinion, when you start a line for a seasonal dragon, you should finish it or try to get as far as you can. Some people believe that you should go as far as 2 evolution stones beyond your level and then stop. Seasonal divine dragons are generally the best dragons, especially at lower levels. However, don't neglect your breeding! With sigils, you can also get different dragon riders and rider gear. Don't forget the double egg token bonus as well! ALWAYS go for this first!