Black Calamity Goddess of Power, Kali

later

Welp...guess it's today :D

To answer your questions...

1) Devil Eschamali, while having double 7c and bind immunity, has no time extends and breaks two of the orbs that DKali needs to activate. You could inherit a different orb changer (such as CDK), but it will take a while to charge. If you are going to be running multiplayer often, Z8 is probably the better option.
2) While rainbow teams usually require all five attributes, I try to keep the team mostly one color. For example, with this card, I will be running Asmodeus, Z8, Revo Haku(CDK), DMeta. All of the attributes I need are there, while all of the cards are also Dark attribute.

I dunno why you got downvoated, really helpful thank you.

I would only worry about making them all the same colour if you plan on making a row or damage void piercer team. Otherwise I'd be more concerned with cooperative active skills. RevoHaku has no place on a Dkali team. Her active skill is just downright counterproductive.

You may want some other subs for color coverage (i.e. Asmodeus or Revo Yomi) but that sounds like a pretty good situation :)