Which 5* champion should i choose?

GodShadowX

My progression is a low-tier cavalier player. I have a strong mutant team consisting of Apocalypse, Professor X, Colossus, and Red/White Magneto. Stryfe would be a good addition but I would have to ramp him up along with the other ramp up champions. I also have many champs that would greatly benefit from Odin's prefight such as Ghost, Hela, CMM, Aegon, Medusa and Hyperion.