Counter-heroes in duel mode (3.1).

Help!!! I was just playing duels against the AI. I can't seem to beat Karli. I've tried with all the heroes, and it doesn't help; he defeats them all. And these runes too... Tell me, which hero can actually beat him?

Karli is definitely overpowered in duels. I have no idea how to beat him against a human player. But against the AI, try Ibby or Ossir. But I don't play duels very often.
Now the experts will come and tell you everything:)