Luthor is obvious.
I could also see Toyman.
Aside from the obvious selections with Lex Luthor, Toyman and the Prankster, I think Bloodsport taking on Batman would be cool.
Toyman, Bloodsport, maybe Bizarro (Batman can outsmart him), maybe Intergang (vs the Batfamily),
Already swiped Intergang for a while lol. Metallo is basically a Peacekeeper. Bloodsport.
For when my rants on the forums just aren’t enough: https://thevindicativevordan.tumblr.com/
Indeed. Batman: Shadow of the Bat #94 is where you'll be able to find it...
https://dc.fandom.com/wiki/Batman:_S...e_Bat_Vol_1_94