About counter-heroes:
Ossir 3.1 definitely doesn't have any. Iris might put up a fight, but even so, Ossir will still have around 80% chance of winning against equal opponents. And in general, if the opponents are equal, all of Ossir's opponents will have around 20% or less.
Ossir's opponents are Vitya, IBBA, Helmar, Leto, Jalib, Iris, Erin, Synit, and maybe someone else; I'm not very good at duels, so smart people will probably add someone else to Ossir's "twenty-percenters."
Iris's opponents are Deidra, most likely. I think she has around 35% chance of success against Irina, Leto has a little less, around 20, and the rest are either not in the twenty-percent range or are? We're not considering Ossir.
Helmar's counter-heroes are Aira - 100%, or should we give the gnome 1 percent? Ossir, IBBA are close to 50 percent (the terrain affects this a little), and that's it. I don't like Helmar. Although in version 2.1, I really liked him. Especially the duel between Helmar and Deleb (what a great pair they were).
Jalib's counter-heroes - there are many of them; it's not clear why the experts rated Jalib so highly. Apparently, they just liked him, and I like him too:D. Deleb, IBBA, Anwen, Synit, Aira, Helmar, Ravenna.
I watched a couple of Sailex's replays, although I think he's a good, even strong player. But these duels are just terrible. Especially Vitya vs. Garuna.