Well, after testing it further, Wings seem perfectly okay. It sucks for you if you dont have airborne creatures / perma control / momentum, but Wings are actually weaker than Hope in a deck built around them. Wings require Spider - Lobo combo, can be destroyed, and Quint on Spider is a requirement more often than not.
5 turns of duration is... well, you need 4 to basically cover the whole match. Thats 20 turns out of 23 that 30 card deck plays. Take 5 if you're paranoid and you're set. But its a great way to balance its usage in rainbow where Wings are definitely better than Hope.
Overall, nice card. I really thought it would suck big time.