You get a week of prep with whatever you can find or buy in the real world with YOUR money. After that you travel to Marvel Universe and get Rhino and Killer Croc as allies.
Day One: You and your allies VS Spiderman who is relaxing at the restaurant with Mary Jane. All you have to do is kidnap Mary Jane in his presence, mainly to embarrass him.
Day Two: You try to do something nice for Wanda (Magneto's crazy daughter) with the help of your allies. If you can think of something that works, Wanda will join your team, much to Magneto's displeasure.
Day Three: Magneto, Spiderman, and Thor have teamed up and are coming for you (assuming Spiderman is stll alive). Your holed up in an abandoned warehouse holding Mary Jane hostage. Rhino actually has a never revealed crush on Mary Jane LOL.
What do you do now? Can you negotiate your way out of this? Do you have a snowball's chance in hell of winning this LOL?
Depending on who YOU are and how much money you have, you might have more of a chance.