Is he (the doctor) like a something to resemble ‘philosopher’s stone’? You could’ve included the harm turning someone to gold does, doesn’t it mean anyhow they’re gonna die? Being invisible isn’t as much the same as being a piece of an object – Gold sounds furious, or may be the person is, who turned into a gold object – or else, doesn’t death happen anyhow? – isn’t it normal to die, anyhow people die, and magic like that of philosopher’s stone and that old story I know – of Midas – does your story resemble the story of Midas – if I were writing one such story based on the logline, I’d include these two as one person – Midas and ‘Philosopher’s Stone’.

Or else, try thinking the ‘other possibility’. Of what I said earlier here. If people die by touch of the doctor, if I were him I’d search for this – where does the power come from? And seeing that he’s genuinely a doctor who’d want to save lives instead of killing – it’s pointless to think otherwise, or else, think of the first possibility. Reasons – why’d he kill, or not kill, when someone is given powers, there comes either responsibility with it, or it goes unnoticed, anyhow, people die. Gold sounds to be more attractive, than a dead body.

Just a couple of suggestions I gave here – if I were writing a story with this logline.