Arts Servants

There are no 5-star arts lancers. Li Shuwen and Fionn are the only 4-star ones. It's a badly-filled niche at the moment.

Vlad III (Berserker) is very good arts DPS, as well as Artoria (Archer). Grab one of them if you can.

On a per-class basis, your options are a little limited right now for NA. Lancelot and Chloe are excellent choices as they both already hit like a truck and have batteries on relatively short cooldowns.

I found a page on appmedia (you'll have to translate to English) which outlines some arts spam team strategies. Obviously not all the servants there have been released but it might be a good resource for planning your future rolls. Take a look: https://appmedia.jp/fategrandorder/263527

As the other guy mentioned, for killing 'basically anything' quickly with an arts dedicated team; with Tam and CasGil, you're going to want to get your hands on a Vlad Zerker. Hope that helps a bit!

P.S. Another good wave clearer with arts NP and a massive battery is Nitocris Caster, though her NP is less good for damage and more about the high insta-death chance.

There are a couple new standouts this year. BB, Sherlock, and Hokusai.

yep! it's a nice that really needs to be filled though.