Counter-heroes in duel mode (3.1).

I have a couple of questions: Has anyone defeated a player with the nickname Arantox? He has the following setup: 1000 Bone Warriors or several (around 15-20, I don't remember) Phoenixes, or 600 Imps. All his heroes have a Dwarven set, some kind of magic resistance, and a mass dispel spell. I've tried several times to win, but I haven't succeeded. And secondly: I need a counter-hero for Sinister, besides Razazak, Iris, and Ossir.