I had a campaign with an evil party once, it honestly wasn’t a great experience. I think it requires experienced players to make it work. It was a struggle to find roleplaying reasons for the party to work together to achieve a common goal. Roleplaying also got a bit exhausting because all the characters were essentially selfish. To make it work, all players should think hard about a compelling reason why they want to work together, it would probably make it easier if they’re all from the same organization for example.