User blog comment:Xandermcc/Next Crossover Theory/@comment-26624146-20170707035147/@comment-27700324-20170707151441

I just feel that would work. If Felicity is dead, her evil counterpart would taunt Oliver and the gang like Black Siren did before.

Also there was an evil version of Supergirl called Ultragirl which is where i got the name. She made a cameo in the Forevor Evil storyline with a bunch of B-list heroes's dobblegangers around her in that panel.