Hi,
I'm not using Zada because its easier for the opponent to remove. The opponent will be reluctant to use most removal on Mirrorwing such as
lightning axe as it would make him remove his own creatures as well. I also found that the opponent doesn't use Mirrorwing that much to buff their own creatures as they
forget they can do that. Also
Blossoming Defense can be used to counter anything like that. Mirrorwing is also a flyer which can be good as nothing else can deal with flyers in the deck.
I've not managed to test the current deck at the moment so this is only speculation.