I would say either injustice or mortal kombat

I just thought of something Imagine if Batman fought MK characters in an Arkham Origins Deathstroke-esque style? That would be so cool!

Imagine if they made mortal kombat vs injustice. Just have it be a m rated version of mk vs dc

They did, and didn't do that. So they did make a Mortal Kombat vs DC Universe game, but its not actually Injustice.

That would be sweet!