Shapeshifting of course. Greatest power out there as you can change even your very genetic coding and cells. That means, if you want to fly, shapeshifting has the plausibility of giving you certain powers. Ie. shapeshift into Superman, altering your DNA and cells to be like that of Superman's, meaning the sun affects you just like it affects him. Now you can fly, have super strength, speed, etc. You can also become ANYONE you want. Want to have an exciting life, go kill and take the form of an adventurer. Wanna test out presidency for a day? You know what to do.