I already mentioned it. If you play with wings as your keycard and you know about the opponents perm control(or just guess it considering the element he is using), why you should play it without PA?
(I just think of most Rainbow decks which would add this card. Ofc a mono
couldnt play PA, but the most mono decks couldnt destroy wings anyway)
I just mean I dont consider whether it could get destroyed or not. If you consider that, there are no strong cards. I just dont expect it gets destroyed, because you cant prevent anybody using PA.
In addition the idea with flying and none-flying wasnt there right from the start, therefor flying creatures arent well balanced among the elements.
But this "airborne" passive opens the door for so many other things....waterborne, grounded, granting airborne to creatures that wouldn't normally have it, taking away airborne....etc etc etc
If you add more effects and corresponding shields, you will just be in the situation always to have all kinds of creature in your deck or else you simply cant defeat some decks.
And losing, because your opponent is practically immune isnt a great feeling.
In my opinion wings is a card taking an unimportant attribute to distinguish whether you can attack or not. This is too random.
I thing to distinguish in a kind like this wouldnt be nice either:
*imagine new cards*
"Chamaeleon" (creatures with the same colour your element has cant attack you)
"Waterproof" (water creatures cant attack you)
"Mirror" (ugly creatures cant attack you pretty ugly creatures even get destroyed), though I like this idea, a good idea to remake some images
"dark cave" (creatures not emiting light hit 80% of the time just air)
"salad" (herbivore eat 5 turns and cant attack)