Need advice with arena team

First of all, sorry for the super long post, but I've felt indecisive for a long time and have been thinking about this issue for over a month and more than ever now with the most recent update. First of all I'll explain the situation with all the important details and after that I'll ask a few questions. My team consists of (in the back) Wukong (32 +5), (in front) Nia (32 +5), Lucy (40 +5), Rudy (32 +5) and Bai Long (36 +5). I want a good team for arena, but I also have my ideals and I don't want to use those I don't want to. Another personal detail is that I've always liked, and still would like to use one hero of every element, something I'm not accomplishing right now. That's why I've never had any luck with the magic type heroes, in which I've wasted a lot of time and elements such as: Espada (30 + 5), for who I had another one prepared to transcend her, Ariel (30 +5), with 4 extras prepared for transcension to level 38, Sylvia (30 +5), with 3 more prepared for transcension to level 36, and Ming Ming (30 +5), with 2 more prepared for transcension to level 34. I was thinking about taking off Wukong, as it will be more difficult to transcend him, seeing as he is a 4L and while all the others on my team would keep transcending, he would stay behind. But now with the 7K/4L selector, things change. Not long ago I got a Dellons in a random 7K ticket in exchange for friendship points (right now he's 5 starred and +5). I'd like to use him and have been thinking about taking off Bai Long for Dellons, as Bai Long hasn't been everything I thought he would be (my fault, as I misunderstood taking away buffs for reducing buffs), and because with the last 7K rework, I thought Rudy would be having a rougher time because of all the piercings, but I find that hasn't been the case, Rudy is still holding on. Because of the reason for doubting Bai Long I've mentioned before, I decided to continue using Nia, as my priority is getting rid of buffs/immunities. And as I've had more than enough dark elements because I didn't have another Wukong either to transcend. My situation with elements isn't any good and a lot of times I've wasted a lot of time with transcension when I could have perfectly had Bai Long and Nia at level 40 a long time ago if it weren't for the lack of elements. I've got a 4 star and a 2 star dark element, a 5 star, two 4 stars and one 3 star water element, one 4 and one 3 star earth element, a 3 star fire element and finally a 3 star and a 2 star light element. As you can see, I barely have any fire elements (because of Bai Long and Dellons) and I have more than enough water elements. Then now for my questions and I please ask for all of them to be answered, if it's possible. Shall I use a magic type (of the aforementioned: Espada, Ariel, Sylvia or Ming Ming, or do you recommend another one that ain't Daisy or Vellika?) in my team in change of someone else? (Wukong, Bai Long or Nia). Should I take off Wukong or should I keep using him and transcend him to level 34 (with the selector)? Should I change somebody for Dellons? (Wukong, Bai Long, Nia, or... Rudy?) Should I keep investing time and fire elements on Bai Long or Dellons? Today I'll get a 7K selector ticket for the check-in event. Should I pick Rudy, to transcend him to level 34, or Dellons, to transcend him to level 32? In the next 7K/4L selector, should I choose Rudy, Dellons or Wukong? Thank you very much for reading my post and I hope you can answer me, I really need advice from people who know about this.

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