Hey!
Thank you so much for the feedback and the awesome suggestions!
Regarding the new Event Missions tab, I actually already have some specific plans in mind for how that system will be used moving forward (you will get a first look at that with the Llamavision event releasing in just a few hours from now!).
However, I have some great news regarding the Easter Tower and its exclusive promo cards and achievements! I am currently planning a system where you will be able to permanently unlock and replay past event towers using the new "Llama Marks" currency. So it is highly likely that you will get another chance to conquer the Easter Tower and claim those missing rewards very soon! :)
Thanks again for sharing your ideas, and have fun with the game!