Batman (2016) #57 Mattina Cover

The KGBeast isnt working alone. As the Cold War between Batman and the Russian killer heats up, Batmans nose for mystery gets to twitching when he suspects theres more to the KGBeasts attacks than initially thought. Not only does this tie back to the court case Bruce Wayne sat on involving Mr. Freeze, theres another villainous Gotham ghoul in playbut whom?