Good farming team comp?

For EXP farming, you can just make a team with Vlad, Heracles, and Nightingale and stack Bursters every turn. If you deal around 10k per card, you can clear each wave in two turns.

If you are farming hands then Mash Nightingale and Herk as front line and Jeanne Tamamo caster and Vlad as the rest of the party
If anything else then
Tamamo Caster Nero and Herk also keep mashu if you like.

Nero/Vlad + Tamamo + Mash is a good team.

It's fine if you just want to buster spam the enemies, but you could be much faster by using AoE NPs. The lower tiers actually have good servants for farming available: E.g. Arash, Alexander, Medusa, Kiyohime, Fergus, Kid Gil, Spartacus, Paracelsus,..

What you want are servants who can kill the entire enemy wave at once with their AoE NPs. And you need a way to charge their NPs fast, for instance by self-charging skills (Medusa, Arash, Paracelcus, Spartacus) or with help of someone who can charge their NP for them (Waver, Ozymandias, Helena, Mash, Shakespeare). Of course you also need CEs with starting NP gauge like Imaginary Element or Kaleidoscope.

I usually use my Helena and Nursery Rhyme + some AoE support with starting NP gauge and then I can NP spam turn after turn.

Raise kiyohime, darius, spartacus, eric for aoe berserker. Equip kscope or similar on all of them. Use friend waver. Chaldea combat suit.

Raise kiyohime, darius, spartacus, eric for aoe berserker. Equip kscope or similar on all of them. Use friend waver. Chaldea combat suit.

I don't know what your levels are so I'm going to assume they're all at max level, NP1, and no fous. Also that you are doing Ember farming specifically. For the other dailies, just go with as many class advantage servants or berserkers as you can gather and raise.

I suggest a team of Nightingale, Heracles, and Vlad, with the best starting NP or Buster Up CEs you have. They're berserkers, so you can use them any day, and they're all strong (though Nightingale as a "support berserker" isn't a strong hitter). Your backline will be Jeanne, Nero (or Nero Bride), and anyone who can fit your cost. Try to make friends with users that have strong AOE berserkers like Tamamo Cat, Raikou, or even Frankenstein and Lancelot.

Spam busters and NPs as much as possible and try to finish quickly, that's pretty much it.

Hopefully you'll eventually roll an Arash and a Kaleidescope to make your turn 1 life easier.

K-Scope Arash, Vlad, Friend-K-Scope-Raikou

farming is generally berserkers, ppl want to follow "lore" and bring some class advantage servants, but berserkers for now are the best