First off, I'd like to say that I love this game, and I play it a LOT. However, there is one thing about the game that annoys me from time to time, and that's when you have an AE where order matters or you have to select X from a set of Y, or similar selections. Firstly, it's tedious, and secondly, on my tablet, the load time to pull back that bar of choices every time can really slow things down.
As a result, what I would like is something where when you get a choice like this, have the normal "bar" with all the cards in it, and then just place an empty "bar" above it. Then you could just drag all the individual cards from the bottom bar to the top bar in an order of your choice, and then it would execute left-to-right through that bar. Obviously, it would still process all the individual pieces (increase/decrease for twist the ether, reactions on destroy, etc) for each target, but you would never have to return back to that target selection screen again.