Actually this is a great discussion because with all the affix's that rotate, this is going to be a complicated dungeon, but lots of fun!

For the most part if your trying to use multiple teams I would just do the assault and skip all of the dailies. The assault has all the visions in it, were the dailies while they do add up are very time consuming. You can hypothetically knock out each assault in 15-20 min, and it would be 2x on Server reset and then 1x more on Friday to the weekend. So An hour a week for each team?

These dungeons do seem to be tuned for higher ilvl, considering just beating the last boss for the first time awards a 420 piece. Then if you do boss + 2 side items it's a 430 piece. So you'll want overall a decent set, but!! next week starts the new season and while the dungeons are harder all of the Mythic 0 will be baseline ilvl 430. So getting your team up shouldn't be too hard.

Onto the comps.

I've tried a main trinity Tank/3x Hunter/Healer, in my case Prot Paladin/Resto shaman and it went fine for DPS. The first 2 runs I did just Thrall, and the third run I tried out one side item and then did Thrall. It felt ok. My ilvl is 430~ across the team and I'm pretty sure I couldn't have done an additional at this time. I did take it slow and easy though and it looks like you'll need to pull multiple packs at the same time to be efficient so AoE is going to be important.

The affix's are brutal for our layout so far that I've experienced so some tactics are going to need to be developed.

I'm currently going to try out a 5x Druid combo inside and I think this team might be quite strong. It has stealth and that enables quite a bit of progression.