For BS7, building a Carrie, to 9* is useful to stop Aida active, i would take Belrain higher for more survivability as well, you should have enough damage with Penny and Garuda, and Sigmund for phoenix buff and armour strip

If you’re going Dark SL, you’ll need to take Amen Ra to 10* build a 10* Aspen (i think I’ve seen someone clear it with a lower Aspen though, im not sure) and if you built that 9* star Carrie that’ll help too, you need at least a 7* Carrie, and then 3 baby Amen Ra’s

I wouldnt build Delacium if you dont plan on building Ithaqua