I've kind of lost some love for Frontier Mode too as of late. It feels like I play the same players over and over, and many I almost always lose to. Maybe they are bots, but it's just as not much fun. My pulls have been lousy lately too and absolute lack of jackpot wins hasn't helped. If we could use the cards in brawls it would be great, but I get exactly where your coming from on the subject. It almost feels like work playing Frontier now vs. fun, at least Modern is more challenging!
!BBH
!PIZZA

I think I have one left:
!DUO