There are trusts that can protect your assets, but a revocable trust is not one of them.
Great question that was recently asked by a potential client. She got bad advice...always double check any advice you get.
While you are alive 'n kicking your revocable trust remains that way. After certain events, that revocable trust becomes irrevocable.
Death and Taxes...the only certainties. However, we can control how much of an assets value is subject to tax.