Wealth taxes are a not the best idea. Being taxed on something illiquid that can’t generate cash flow is the pinnacle of dumb taxation. For example, you have a piece of art. You’d have to sell something just to hold onto the art, and if you don’t have anything to sell, you’d have to sell the art itself just to pay for ownership of the art. It would make some sense to increase capital gains taxes instead of slapping people with a wealth tax. I say this as someone that would not be hit by a wealth tax.
Also, the rich can simply move assets out of the country, and then you erode the very thing you want to tax.