Tip for arts team?

Ascend and max out Tamamo Caster ASAP. She is basically the best arts support servant in the game. The only reason Waver is considered better, is because he's the best generic support and can fit into literally any team comp. Tamamo on the other hand is tailor made for Arts teams. Seriously in terms of support servants, Waver is the best general support with Hans acting as his free to play variant, Merlin is the best Buster support, Skadi is the best Quick support, and Tamamo is the best Arts support. While Tamamo will never let you have the super OP memeness of Merlin or Skadi, having two of her will basically let you fire off your main DPS' NP every turn or every other turn, while healing your entire party. So yeah, best advice, raise her as soon as you can.

Until you've raised Tamamo I'd go with Saber Lancelot, Summer Artoria and Helena. You'll NP spam quite a lot with this setup.
Unfortunately Artoria will steal some of Lancelot's stars but she can also generate quite a few with her two quick cards.
You could also choose either Artoria or Lancelot and combine one of them with Caster Marie and Helena as supports who generate stars for your main damage dealer.

Normally a Art team's configuration is 1 Damager+2 Art Support.

And that damager are recommended to have 2 Art card+ Art NP. Off course, Casters are also welcome. Therefore all you listed, Lancelot, Kuro, Archuria, all casters can fulfill that role

Well the 2 supports could be Tamamo+X. depends. Normally is Tamamo+Waver, but other servants can also be applied such as other supportive Casters, Jeanne or some servants with 2 Art cards and Art NP (Nightingale, d Eon, Mashu, etc). But again, the more Art cards, the better

Art team are generally focusing on
(1) durable fight = Quite relying on spam of high-level skills and NP
(2) team buff and enemy debuff
(3) Using Art NP as major source as damaging (NP level for that damager is critical)
(4) Art Chain of team generally > anything, except Saberlot's/Archuria's Brave chain. Quick/Buster cards are not recommended to use.

Therefore you can see how the importance of Tamamo in Art team because her NP is engine of Art team, no matter who paired. Even the effect of team's skill CD reduced is already OP enough.

her 1st skill is to delay boss's NP (well, combined with Orion/Vlad, Waver or even Archura, you will find any boss even wont release NP in any Marathon fight),

And her 3rd skill is top-class with long lasting, short CD. Not saying Saberlot's Art critical damage could be huge boosted, but many offensive Art NP can also recover huge amount of NP due to that, like your Archuria, or Surfer Mo in a multi-boss/farming fight , they can spam NP turn-by-turn easily. Let alone target-able healing (Vlad: NICE).

Even her 2nd self-defense skill, still good because supports generally dont have class advantage if not fighting against Assassins.

And a Turtle Art team like +Jeanne, Mashu, d Eon, they can still benefits from Tamamo's healing and NP effect.

I am not exaggerating my beloved Tamamo, but it is a matter of fact. Her few weakness when not facing Rider, is mediocre NP gain, but this could be a win-win snowball effect with Waver and Merlin and Art chain of Art team. And appropriate CE are suggested.

Tamamo is the best arts support. Put her in every arts team.
You have some top tier damage as well. Lancelot, chloe, np2 artoria.
Secondary damage can be arjuna, emiya, martha.
A second support in helena or medea lily.
For tank, use chevalier or summer marie.
The goal is continuous np use, so pritoritize tamamo. Try and mix and match according to enemies and personal preference.
Some free options are medea, hf hassan, and mashu.

You've got some good ART Dps and blessed with broken ART supp.
Raise Tamamo first, she's does her best when supporting any kind of ART team.
You can also raise Helena or Marie later ( if you've max ascended them already, just enjoy pure entertainment of broken art team in FGO ).
Mozart can also a viable unit with very Strong Art steroid, 1 turn Crit for your DPS, ATK down and DEF down.
That's included Art Crit team, Art spam team, Art stall team and Art Nuke team.
Oh yeah, Art team is pretty tricky to used because mostly they're trickster combined with so much unique NP effect and Skill effect.
It's pretty easy to make an art team for example just put Helena, Tamamo and Lancelot together.
I use Art Nuke team much to clear so much FGO content. Also i uses Art team to finish Nero Festival Grand Final ( this team learn toward art stall team ).
Have you seen or Achieve Art damage 500k to 1 m or more on a single turn? With buff stacking for a few turn that's doable.
I used Robin hood, friends Tamamo, Mozart, Helena and i can also put Saber Fur Elise/D'eon for further buff and debuff.

waver support+tamamo+any arts dps :v
your best one would be waver+tamamo+archuria np2(my setup is this or replace archuria with nero bride). or lancelot,put 2030(if have) in tamamo and use waver+tamamo+lancelot.