The universe was multi-dimensional and space-time was infinite.
In the infinite space and time, Garen knew that there would always be some talented and unimaginable foreign dragons that could be similar to Black Dragon Cory. With the body of a demigod, they could defeat the original Aragami that was not too strong in the main material plane.
" I only need to find sufficient numbers of such mutated dragons in different dimensions and throw them into the battle between the weak and the intermediate. It'll be enough to turn the tide of the battle and turn defeat into victory before the main material plane collapses!”
Including Garen himself, he was also a Variant Dragon, so he knew how powerful the Variant Dragon was.
Of course, the mutated dragons here referred to true dragons with positive mutations and special talents, not all true dragons that had mutated.
True dragons mutated a lot, but there were very few positive mutations.