It was with star coins. That's why I said "if you can".
I don't know how Nutaku will handle it but it's your choice.
Dark Ama would allow you to use a team like this for defense:
- Shingen with Attack down A-Frame or Jeanne with PF but you will need to run Osiris, to play save.
- Satan AW/Amon (in your case)
- Pluto
- Berith (for tanking) or Chernobog (has 100% def) or Osiris (if you want heal)
- Dark Ama --> Snipper + BP
Berith and Chernobog are strong Dark Himes. They both hit very hard, more than Satan AW, Hades AW and Susano AW.
"Important", well if you really main dark then you should Miracle at least Berith if you don't have one of those two power packs until the 4th Miracle Ticket.
Otherwise if you don't main dark, your team is good enough.
Chernobog is still a bit tricky, Berith is overall the better choice because she dosen't run out of her damage after Burst like Chernobog with her "One-Man-Army"-Skill.
Don't forget both have a good synergy with Osiris too!
Like I said before:
Chernobog = One-Man-Army Mode --> 500 HP/T & 100% def
She has a Skill that offers every 5T 30 BG --> Synergy with Osiris and Pluto
Berith = 100% ascension as a Assist Skill for herself --> synergy with Osiris.
Why? Because with 100% ascension she will get more healing, but her assist skill is just for herself not party.
Basically Berith won't get 1.100HP from Osiris but a lot more...
That's why I am saying you should keep your eyes to get one of those two.