I would like to suggest to change the Atlas mini-game mainly due to two reasons:
1. The mini game itself takes a lot of time but is missing the "fun factor".
2. The rewards (with focus on the golden wings and cards) are nice but there is no other possibility to obtain and they seem to be unreachable.
As to the first point, in my opinion the mini-game is missing some events and/or a challenging aspect. Currently, the only possibility to fail is when the tank or heal dies or gets a crit/disconnect (with probably the second occurring more often than the first...).
Moreover, there is not a single event to play, no movement needed but just to kill the enemies.
Compared to the normal mini-games like Malatina... it was always needed to do some kinds of events in order to accomplish the minigame. Also, in other minigames there is a timer so that you might even fail when you do everything in the right way, but are just not fast enough.
As to the second point, I personally don't like super small probability rewards which I might not even get when I open the package a thousand times. Instead, I would propose to make wings and the most rare card a fixed price, for example for the price of 25 * 50 = 2500 atlas scrolls or make them obtainable in-game in a different way.
Best regards
Yibsi