I love what you guys do with arenas and the battlepass, but I wish you handled them slightly differently. I don't think there's much wrong with the battlepass, but what's chosen to be premium content and when you unlock that content could be changed for the better. Just FYI, I have bought both passes and I'll be buying Set 4's as well.
For starters, Set 3 released the UFO Sprite. I really think it makes sense to give this to all players that played during the set, rather than premium pass owners. People that buy the pass almost certainly have a better little legend anyways, so most people that own the UFO Sprite don't use it. If I were a player just starting in Set 3, or I didn't have a little legend I liked, the UFO sprite would be a perfect fit. There were so many people using the plain River Sprite when Set 3 came out, it was a bit disappointing. Now Set 4 has the Jade Sprite, but it's going to be another premium pass thing that I'm sure won't see much use especially now...