system
Given the following post, respond as if you're commenting on Reddit:
human
[Marvel] What information do I need before making a Faustian Deal with Mephisto?

Can I hire someone like  Forge or Shaman to act on my behalf during these negotiations or is it all on me? Is Mephisto the only one who makes these deals or could I shop around with Dormmamu or Chthon? I want to get the best value for my soul here and Mephisto seems kind of weak but he seems slightly more trustworthy then the  others.

Whose the most trustworthy person I could sell my soul to? This seems like a dangerous operation and I want to be well informed before making this decision.
gpt
No matter what you do you are going to get a bad deal, even if it looks like a good deal it is a bad deal.  Maybe you get fame, fortune and you never age.  And Mephisto doesn't get your soul until you die a natural death; so after you make the deal Mephisto has someone drop a tree on you.  Your best beat might be to sell your soul to Mephisto for something valuable to Dr. Doom.  Doom hates Mephisto so if you give him a good enough reason he might just help out, but this is still a bit of a longshot.

Or as an alternative don't sell your soul; instead fall in love and get married.  Then sell your marriage to Mephisto and he will give you pretty much anything you want for it.  You don't even have give up your or your spouse's soul.  Mephisto just loves being a homewrecker.