Possible Ploy for new DC/Marvel Crossover

Every comic book nerd has heard of the infamous miniseries that both titans of the comic book industry created. But if we were to bring it back, how would it be done? Here's how I think it can be done:

Phase 1- The Collector and The Grand Master have an failed attempt of a decisive tournament between their universes heroes and villains, due to them defeating both cosmic beings. They soon across the Planet War-World ruled by the tyrannical Mongul and his world transportation device and come up with a deal with him that he'd get a profitable deal from their selection of fighters between his universes heroes and villains with theirs in exchange of using his device transporting those that would be a matchup by their choosing (like some of the matchups I mentioned before or like Sentry -Marvel's Superman- against the Man of Steel himself or Solomon Grundy against the Hulk or even The Hand versus The League of Assassins. I think Lady Shiva would have a formidable foe in Elektra or Daredevil). This would go on until characters from both sides get wind of what's happening and join forces to take down their game wardens. Things seem to go in their favor until Thanos and Darkseid show up.

Phase Two: While events from Phase One are happening, the two main baddies of both properties are disputing the situation. Both have met each other prior to earlier as Thanos had plans to conquer Darkseid's realm Apokolips. But upon learning more about the sadistic conqueror, he comes up with a propositional alliance with him after getting wind of the Cosmic Brothers' tournament. They both come to a compromise that could equally split the galaxy in two after agreeing with the point that taking out the heroes that plague both of them would be like shooting fish in a barrel; as well as both having the Cosmic powers from both The Collector and The Grand Master (though Thanos would have secretly steal it first to undermine his immortal adversary. After they both create a device to absorb the power from the cosmic beings and taking down the forces that would stand in their way (the Nova Core and Highfather), heroes and villains from both sides agree to take this galactic threats down together after both brothers are taken.

Phase 3- The greatest war in comic book history begins as the heroes and villains of both properties take on the combined forces of Thanos and Darkseid before they can drain them of their cosmic essence and have no way to get back home. The climax could have a specialized team of selected characters from both sides infiltrating the base of the two big bad baddies to take them down while secretly bringing in two secret weapons in case one or the other fails. The heroes and baddies eventually triumph as they free the cosmic beings and make them set things right after agreeing to keep in touch with one another in case something like this happens again.

Possible Phase 4: Years after the events prior, the villains from both sides decide to combine forces to take over the world and it's up to the good guys to take these villains down once and for all. The great battle of good and evil has begun yet again.