Who would you put on his team and what would be their mission? Afterwards, put an X-Men team together that you would like to see as the sparring parter for his team.
Personally, I envision Cyclops coming back from the dead and being sought out by Shadow King to lead a team of villains King has put together. Cyclops would serve as the field leader under the Shadow King while SK will be the mentor/head of the group from the shadows ala how Xavier was the head of the X-Men back in the 80s/90s when the general public did not know he was a mutant let alone an X-Man. Shadow King's goal is to gain dominion over the cosmos and he has put a team of villains together to help him achieve his endeavor. Cyclops joins the team because SK has promised him a position of power in his new universal order. Scott is a changed man who believes the only way to bring peace to the universe would be to bring it all under the rule of a single power where he has a position of authority. SK mind links and allows Scott to see that he is sincere in his promise to let Cyclops rule beside him.
The team cannot have more than 7 members on the combat team. Since I used Shadow King in a Xavier-like role, he doesn't fill in one of the spaces. Nobody has to use Shadow King, by the way. You can come up with whatever premise you want for Scott's evil goal and put whomever you want on the team.
My team:
Shadow King (mentor/overall leader)
Cyclops (field leader)
Spiral
Crule
Absolum
Siena Blaze
Lady Mastermind (love interest for Scott)
Blackout
My X-Men team:
Storm (leader-of course she has to lead the team opposite to Scott, duh!)
Nightcrawler
Gambit (he leaves Rogue and finds his true love with Ororo)
Magik
Colossus
Classic Wolverine (only if he and Storm don't get back together romantically...and this would set up the ultimate Scott vs. Logan fight!)
Bishop
Okay, you guys, your turn!