Stealing Souls, Satan can do it..can we? Options

I am curious, not because I am a satanist but because I really would want to do this. I always here of people (usually satanists) selling their souls or making a pact with a demon or something but is it possible for another human to infact give away their soul to another? My reasons for wanting to know your opinion are quite private but I just am wondering what you think.

you confuse karma with a human sense of right and wrong.

karma is universal, and not easily understood.

before you claim to believe or not believe in something, you should research what it is al about.
Karma is not really about direct action reaction. It is about a sort of balance scale inside your soul, which fluctuates depending on actions you take. The result of that balance draws certain experiences towards you and your soul, in this life and the next lives. A bad karma balance will tend to draw events of equal polarity towards you, thus bad events.

This is just the gist of it, but it does not matter that much, because it is humanly impossible to be sure of the karma result of your actions.
Unless your actions or magic only effect yourself, then the karma result is minimal.

To a mage karma is more important than a normal person, a bad karma balance will slow down or stop your progress in magickal paths. Unless your working with such aligned, "dark" entities.