Count Dooku versus Magneto...
Count Dooku is sucked into a black hole, and he emerges in the X Men universe. He gets to his feet, examining his surroundings, and sees that he is in a huge warehouse. Inside the warehouse are metal girders, metal beams, metal car parts, a shitload of metal.
In walks Magneto. He thinks that Dooku is after Dark Phoenix, so he decides to kill Dooku.
Dooku plans to kill Magneto, well, because he is a badass Sith Lord.
They start out 100 feet from each other, it's a fight to the death.
Dooku's lightsaber will be unaffected by Dooku's powers, pretty sure he'll need it.