I noticed today after the update, I am facing more death matches in arena. My old method don’t seem to work at Streak 11, 12 and 15 as I am now getting rank 5 doom, absorbing man, Hercules, iDoom, Kitty and kingpin which is a bit annoying.
I used to do two 6*r3 and one 4*r1 for 11 and 12. Today at Streak 15, I used two 5*r5 and one 4*r1 and had to fight either a rank 5 doom or a rank 5 absorbing man (31k). AM’s regen was too much for me…
Here’s another example, probably not the best one but you get the idea:

Now I switched to one rank 3 and one rank 4 at streak 11 and 12 but I am not sure if everyone have that many rank 4s in their roster.
Maybe you can let me know how you do your infinite streak after this update? Thanks for your valuable insight guys!