Posting this for a user I played named Linux. It's a work in progress, but I've had pretty good results with it so far. I based it off themathwhiz's Feln Berserk
deck. They're trying a budget build with some experimental cards, but this one plays it a lot more safe and expensive with a more standard aggressive Feln package.
Also added Mirror Image to the market as an out for Permafrost and another wincon when you need lots of damage.
Added Honored Skygaurd because it's nuts. Not sure how I missed it on the first build.
Tweaked the power base and went to a 3/3 split on Momentum Builders and Dark Return. Deck feels pretty "done" right now, I might do a writeup after I get more reps in with it.