I have played arena with flightmaster dungan as one of my cards. In the first game, I played the card and selected to summon a 2/2 in 1 turn. Nothing happened. I thought it was a problem from me. Next game, same issue.
I would have attached some photos for you to see IF I COULD. I recommand you look into as I am very unsatisfied.
It is not fair to wait 1 turn for a 3/3 to summon with having no impact whatsoever to the game.