Transformation, huh? You can't help but feel disappointed. About the only thing you could safely wish for would be a healthier body, or a body that ages well. Otherwise, you might get stuck as someone or something entirely different, and then what would you do? You would have no ID, no family, no job...if only there was a way to change yourself without relying on a temperamental genie to show up and grant your wish. Wait, maybe there was. After all, technically, the genie didn't say the transformation had to be a permanent one..
"Genie, what happens if I wish to have full control of my body at will? I mean, what if I wish to be a shapeshifter?" you ask, hoping that you can get some insight from the genie without actually wishing.
"Oho, ambitious, are we?" the genie chuckles wryly. "That's a new one, most people just jumped on the bandwagon of being more attractive or younger or somesuch. Hmmm," the genie ponders, stroking his chin. "I suppose it isn't against the rules. There have been wishes that involved the ability to transform, such as therianthropy, not that they all ended well. Making you a shapeshifter would in fact be transforming you. I don't suppose I can get out of this one," the genie grins disconcertingly.
You're still a little wary, but this wish seems safe to you. After all, no matter what you change into, you can always change right back to your normal self. You will still have a life to return to. You nod to yourself and take a deep breath.
"Genie, I wish that you would transform me into an immortal shapeshifter that is in full control of its powers," you say with determination.
"As you wish, Master," the genie shrugs, then there is a flash.