Bwahahahaha, I just read this on reddit and was coming over to post it. Curse you, Rubin! :Shakes fist:
Still, this is incredibly awesome.
Now, to not stop pushing until we get a Berlanti-verse Supergirl-Flash-Arrow-Legends of Tomorrow super mashup including the in-universe version of the Suicide Squad. And Hal Jordan, because they've been teasing that SOB for way too long, now.