Right now I have 37 ISO-hungry little birds in my roster-nest. Almost feel guilty 
Whom to feed first, upcoming Wasp I think is a priority, she’s 5/2/2 and should be quite useful after upgrade?
i’m trying to champ the remaining 3’s and keep rotating 2 star champs
still have plenty of 4’s to level
Right now my hungriest is Medusa, with 3 extra covers in the waiting. Then it’s a matter of refilling iso to my 2* farm, since I raided it after opening my LT hoard, to champ Gwenpool and Kate Bishop.
Maybe someday I’ll be able to slip a little iso to some of my hungry 5*s, but I’m not holding my breath.
I got a bl4de and 2 wasp covers in queue, with 1 week left. Don’t think I can champ both unless I borrow from my 2 star farm. But I don’t have any 2 stars at 144 right now. Hope I can pull some this week!!!
Champ the newest ones first as you will be earning covers for them the longest.
I am debating between what Fightmastermpq said (champing newest ones for extra levels) and championing the ones that I have a cover for out of the 12. I am inclined to the latter. That way I will not have to sell covers.
Championing the old ones are out of the question at this point (unless you don’t have the top ones done). I will be selling Ghost Riders, Venoms and Electras of this world untill all the latest are championed (or I don’t have some max covered).