[Keeper of Dol Guldur]

How about Gandalf shooting out beams of pure white light that can seriously scare and or harm dark creatures. He chased off the Nazgul single handedly on a few occasions, and contested physically with the raw power of the Balrog of Khazad-Dum. Not to mention he can speak a multitude of animal languages and smoke tobacco for thousands of years without even getting a trace of lung cancer. And he can percieve things from afar like when he contested with Sauron's eye from Caras Galadhon to draw attention from Frodo on Amon Hen. They were really, really powerful without using their full potential, so maybe they couldn't all shapeshift or manipulate people with no more than the sound of their voice, but to be able to contest mentally and physically with Sauron (although never openly), the Balrog, the Nazgul Lord, and more, at least Gandalf was a supreme being.