All you need to win a war is...
Hyperion in defense. Have as many Hyperions in defesse as you can. Tell your mates that Hyperion in defense does more damage than in attack, so everybody puts it in. So they war will be decided for who has more Hyperions in map.
You nerf Doctor Strange's power gain, but you introduce Hyperion, whom got a power gain incredibly higher... what's the sense in that?
Scartlet Witch could easily beat Hyperion, but she was nerfed, so she doesnt beat him easily. Magik could power burn with her special 1, but only special 2 causes power burn for now, so she doesnt beat him easily either.