All mana symbols and expansion symbols are copyrighted. The words are apparently trademarked. Basically, don't use any of that for profit and you should be in the clear.
Some people get confused between patents, copyrights, and trademarks. Although there may be some similarities amongst the three. These kinds of official statement or intellectual property protection are different and serve different purposes. The right conferred by the patent grant is to exclude others from making, using, or selling the invention. A patent for an invention is the grant of a property right to the inventor, issued by the Patent and Trademark Office. So new invention should be patent and be copyrighted.
Copyright Symbols and Names?