I'm gonna say the team wins in a tough fight. A non jobbing mags and doom are both beastly. With all the metal on apokalips and dooms magic/science I can see the overwhelming Mongul. He could probably eventually break their shields but he would have to focus on one at a time (both their shields have taken shots from galactus, beyonder, nukes and the like) while he's fighting one the other can get creative with ways to hurt him. Plus Doom fears no one and mags isn't far behind. Neither will feed the yellow ring.
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