No government has ever taxed wealth more than once, Mysteriously, once the authorities have gone down this road, the tangible assets vanish. Not necessarily because the government seizes those assets, but largely because the assets are converted to cash and the proceeds sent beyond the reach of the taxing authority.
That is what wire services, shell corporations, and offshore accounts are created for.
It can be traced, of course, and criminal proceedings instituted to recover the funds, but probably not before the principal beneficiary has passed on.
The smart wealthy folks do not wait until the wealth tax is passed.
They move their wealth first—when the ideas are under discussion.
Why take a chance?