Arena is becoming stupid

I don’t know how arena opponents are selected but when I go into a match with 3 r1 7*s (Mordo, Stryfe, and blade) and get matched with r4 max sig dark phoenix, serpent, and kushala(Kushala is fine just adding for completeness. I just don’t see how that’s winnable. Also seeing a maxed dark phoenix in on average 2 of every 5 arena rounds it’s just tiring. I don’t know if there is anything that can be done but as a mode arena has become brutal with the addition of r4s. The range of champs for the top arena has gotten too big to be feasible.
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6* became the new 5*, r5 classed out r3 on the 6*, 7* added; as stated, the safety ceiling for arena regularly shifts. nothing new.
1) Sort by hero rating - highest at the top working down to lowest rating at the bottom.
2) I count 48 champs down and just start picking from whatever ranking that is and working up my roster.
3) When I get to win streak 8 (going into the 9th round) I scroll to the top of my roster/highest ranked champs and then start working down my roster.
4) By the time I get out the other side of 14-16 I find my lower ranked don't trigger death matches.
It may not work for everyone's roster, it certainly works for mine - but feel free to give it a go if you want.
If it doesn't work you haven't lost anything BUT if it does work you've gained the ability to get through arena more comfortably.
@MidnightKing @phillgreen
@winterthur can give excellent advice on the arena grinding with a less optimal roster. Above is his most recent post that he did, which is a few months old, but I'm sure he can give you some updates since the inclusion of more r4 defenders.