Suggested by Destroyer Jack Frost is an ice fighter whose power level tends to flucuate quite dramatically. At his best he’s honestly not that bad though. He can shoot focused blasts of ice and can even fly. I don’t know about you but that doesn’t sound bad to me. Still, I would have to give Black Widow the edge here. She is a lot more adept at hand to hand combat and has some pretty good gadgets at her disposal. Frost won’t be able to keep up and without being able to land his ice blasts he is in a difficult spot. Black Widow wins.