How to become a tax attorney?

I have bachelor's degree in Business and will be starting an accounting master's at UNC Charlotte in the Fall. If you do not hold an accounting undergrad then the you cannot obtain the accounting masters with an Auditing or Tax emphasis. I will only be able to get a generic Accounting Masters. The process to complete the short amount of cles to get my accounting undergrad is simply silly and cost prohibitive. If I begin school and shift my life into full time student mode again then I'm considering law school as well. Is it possible to market myself to future employers as a tax attorney with just a CPA and JD? Do I need that special emphasis accounting grads obtain. Also, is it even worth it to worry about this or is a lawyer with a CPA still very marketable?