Well, I don't know how it does against FG's, but I wouldn't recommend it
Actually, I think the BE Scarab isn't a bad combo.
I messed around with the following version.
Hover over cards for details, click for permalink
5rq 5rq 5rq 5rq 5rq 6rq 6rq 6rq 6u3 6u3 6u3 6u3 6u3 6u3 6u8 6ve 6ve 6ve 6ve 6ve 6ve 71b 77d 77d 7ap 7ap 7dm 7q5 7q5 80h 8ps
I'm not used to play scarab decks, but I won 16 of 20 games in AI3.
I noticed that the SoR's arent very needed. They're very helpful to start with mitosis, and one should be used
on a devour effect, because it happens that you're short on gravity quanta. But the pends give enough entropy and time quanta to use every skill you want.
I replaced lots of buff, because the SoR mitosis combo buffs the hp as well as the heavy armor. Mitosis does the rest in atk.
You can change the deck in many ways if you want. Replace something for a sanctuary to prevent black holes, or try some sundials to stall until the SoR-Mito Combo.
Just always pay attention to not deckout. I usually stopped around ten cards with extra drawing.
It was fun for me, as it was the first scarab deck I ever played
I hope you find a build you'll be happy with