User blog comment:Skipaleeto/The Strongest Cards In Injustice/@comment-28140789-20160617031715

Aside from the characters Oneanimal mentioned, I think you're also excluding Green Lantern/Red Son, Killer Frost/Prime, Superman/Red Son, and Wonder Woman/Dawn of Justice. (Oh, and ah, there are two/three characters I am thinking of that I won't tell you. And then there's that character...)

You also definitely missed Sinestro/Antimatter.

Batgirl/Cassandra Cain I've never gotten the chance to use, but it seems she can be powerful.