The difficulty with Card Levels
Apparently, the Card Level is the main boost for your bird power, but it's complex to try to develop them to a higher level. For an example, my birds are at their level 20's, and only two of them upgraded their card levels to Elder; while the rest of them are at their ordinary card levels.
Though, the only way to master your birds is to search for feathers. Searching for feathers isn't an easy task to do. Well, yes, there are actually plenty of ways to earn feathers, but most of them are tricky.
Take the Arena as one of them. In the Arena, you would get a 65% chance of losing during battles. Yet, you would only end up earning a minimum of 2,100 feathers when you complete all 7 winning streaks (which honestly isn't really much.)
Plus, earning feathers by chests is another way which isn't "really" tricky. You just pick a random card, and find yourself with 12,500 shiny feathers for one of your birds. But it's not that simple; as most of the time, you would only get 100 feathers.
The only easiest way to earn feathers is to get them by feeding your adorable Hatchling. Despite the fact that it takes approximately 5 apples (or way more) to avoid your hatchling from leaving, you got a whole day to earn them.
Okay, does anyone have the same "problem"? Also, are there any "tips" to get lucky guesses on chests? If there is, go ahead and share it.