The new UI for the market is nice and it needs to get used to. I struggled a bit at the beggining but now I managed to filter the cards lol. I like your idea with the backfire strategy. I would try to add one or two cards with swiftness to the line up to make it even more powerful. For example with River Nympf or Supply Runner. They would add one speed to the whole team and increase the miss rate for enemy attack and thereby increasing the backfire :-). Nice post!
I have picked this post on behalf of the @OurPick project and it will be highlighted in the next post! 
yea the new ui is now amazing and the more people use it, the more they get use to it and figure it out.
wow using a swiftness ability at that point really skip my mind but add it will surely increase the missing chance and also give me more advantage over him. really appreciate the comment @achim03 and also thanks for selecting my post on behalf of @ourpick