get heros that remove buffs or silence/block his skills

First attack someone else, then kill rudolf, after  kill all the others. Many tactics, easy kill, just don't play auto.

Feed him marshmallow xD

More seriously, why are you asking for something as preposterous as nurfing an op unit? There is always one or more and there are chances we could get him sooner or later. There is nothing wrong with an op unit unless its unobtainable and I think Reinbeast is obtainable like any other hero. What's next, asking to nerf Nicolas, Kazar, Longbeard erc, cause you didn't get them yet and can't beat them either? Asking to nurf brutal cause you can't finidh it? I mean let's be reasonable here, Heroes you didn't figure out how to beat yet is the least of your problems. You probably haven't used the app long enough if you think it isn't.