system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] I have cancer in an advanced stage with bad insurance and too many people counting on me to die now. Which super being good or evil is the most likely to be able to save me at the lowest cost?
gpt
Hmmm... 

Well, the list of people that *could* is still pretty exclusive, despite it being full of superpowered beings. 

Mephisto: could absolutely and instantly cure your cancer, but there would definitely be a price you weren't comfortable paying. 

Dr. Strange: with the advantage of having actually been in a medical profession (though he was a specialized neurosurgeon, so his expertise might be less useful in that respect than people think it would be), and Magic, he could almost certainly help cure you. Once again though, it's not going to be free. All magic comes at a cost, but unlike Mephisto, Strange would at least do his best to keep that cost minimal.

Most of the science based characters couldn't do anything to help you. End stage Cancer is End stage cancer, after all. Among them, your best shot  might be Reed Richards, who does, occasionally, make some forays into attempting cures for diseases. What it would cost you? Who knows. Reed varies between altruist and asshole at the drop of a hat. It might also take longer than you have left to live.