That's a very negative attitude to have towards people with wealth above some magical number you deem "too-much".
People will get very illogical and angry when they see you blatantly stealing from their children. I know I will, because at the end of the day, I work for my progeny. An estate/inheritance tax is not taking away from my well-being, but from that of my children.
So, instead of fixing the problems with your form of governance, you decide to impose even more tyranny over the few who can possibly take advantage of it. The problem is not the money that allows them to possibly take advantage, but the corruptible system you have in place. Use that effort in making it actually noble like it's claimed to be.