Every Hero in Gotham is dead. The villains of Gotham fight to see who can gain control of the city. The villains start out with no mobs, gangs, mafias, etc. but they can build them up. The villains cannot leave Gotham. The winner is whoever is the last living villain.
Good luck trying to get in range using that Agent Orange when your entire organization is barfing up Mycobacterium just by coming into view. Her connection to the Green allows her to track pretty much every human on the planet. She'll then grab them all with vines and melt them with acid from her pitcher plant.
If a Black Lantern can't really touch her what makes you think a any of these guys will.