Doom Still Around ... Just tell him Reed once could create Anti - Terrigen
Peter Parker and His Horizon Pals
Ultimate the team that created to solve ultimate/Cosmic problem (they could even solve Galactus hunger)
Galactus the Life Bringer that could bring Life to the Planet he once 'eat'
T' Chala One Smartest and leader of most advanced Country, Plus his relationship with Storm and the X-men
Adam Brasher, he smart isn't he ?
Captain Marvel, She could ask kree delegate for Terrigen Crystall.
Miss America, she could travel to alt Universe, maybe in one of those alt they found Cure For M-pox or Beast could ask BB medusa to travel betwen alt to ask another Royal Inhuman to Spare little bit of their Terrigen Crystall.
Is the mist problem much harder to solve than Wanda "No More Mutant" spell ?