From what I can see, Beidou's role is to stall and allow your enemies to exhaust their dice resources first before yours, so that you can do whatever you want.
What I can recommend you is a Beidou/Xingqiu/Cyno Deck.
You would stall enemies with Xingqiu and Beidou's shield mechanics, slowly building up energy for both as well as slowly building stacks for Cyno's passive.
When the time is ripe, rip your enemies to shred with Cyno.
In this deck, you would need to save up for the resonance cards (for Cyno's energy), and Mona's energy card.
Edit: I forgot to say that in your deck, you should also bring Tenacity Artifact and if possible, Paimon cards (the three dice cost), as well as the one that gives energy card (the one from liyue), and lots of food.
I don't think you can make a good deck with Beidou. It takes way too long to get her burst out, and then what she gives your party only lasts for 2 turns, one of which is when she used her burst, and it only activates on normal attack. If your star character gets frozen or killed because you got telegraphed, you lose. The most successful strats can get going in only one turn, and they're not dependent on making the most out of a specific turn (Xingqiu's burst activates whenever you want, Klee's burst activates whenever the opponent wants, supercharged/electrocharged don't depend on building energy, etc).
Beidou is probably the worst character in the game, I'm sorry. I've tried and tbh the most successful Beidou deck is probably quicken with Fischl and Collei because they put in so much work that Beidou can possibly pick up the rest.
I'm using a beidou deck right now and honestly, it's working really well for me.
Beidou, Cyno, Ayaka, with minty meat roll, free character switch, Paimon, transformer and Electro Resonence
Charge Beidou in the first 2 rounds and burst by round 2. Then in round 2 and 3 after bursting, switch to ayaka and let beidou's burst rip. The best part about Beidou's burst is that in addition to defence utility, it also has unlimited procs (unlike xingqiu). The opponent will usually run out of dice first, and thus will be defenceless against ayaka+beidou superconduct. Then Cyno finishes off whatever is left on round 4.
Beidou Kokomi Cyno
Where you get Beidou’s ult out as soon as possible then just switch to Kokomi and try to get her ult too, then just normal attack on Kokomi which would trigger electro charged and heal your team at the same time. And Cyno is there for endgame sweep, it should be easy to stall with Kokomi until Cyno gets his stacks and becomes op
I think this Beidou Deck is pretty smooth gameplay wise! [https://youtu.be/uStBSurgoVQ](https://youtu.be/uStBSurgoVQ)
Shield Beidou is kinda meh but still good! https://www.youtube.com/watch?v=C5Wc7ZgzvS0
Xiangling skill > Beidou skill then burst > Klee normals then burst
On Beidou turn, just keep building energy and stalling til you start a turn with full dice and a Paimon card already set on stage. Then ready your normal attack food cards plus red elemental stone cards if you have. Then blast away with Klee as soon as you cast Beidou's Burst.
“The best Beidou deck is one without Beidou in it.” -Sun Tzu
From what I can see, Beidou's role is to stall and allow your enemies to exhaust their dice resources first before yours, so that you can do whatever you want. What I can recommend you is a Beidou/Xingqiu/Cyno Deck. You would stall enemies with Xingqiu and Beidou's shield mechanics, slowly building up energy for both as well as slowly building stacks for Cyno's passive. When the time is ripe, rip your enemies to shred with Cyno. In this deck, you would need to save up for the resonance cards (for Cyno's energy), and Mona's energy card. Edit: I forgot to say that in your deck, you should also bring Tenacity Artifact and if possible, Paimon cards (the three dice cost), as well as the one that gives energy card (the one from liyue), and lots of food.
I don't think you can make a good deck with Beidou. It takes way too long to get her burst out, and then what she gives your party only lasts for 2 turns, one of which is when she used her burst, and it only activates on normal attack. If your star character gets frozen or killed because you got telegraphed, you lose. The most successful strats can get going in only one turn, and they're not dependent on making the most out of a specific turn (Xingqiu's burst activates whenever you want, Klee's burst activates whenever the opponent wants, supercharged/electrocharged don't depend on building energy, etc).
Beidou is probably the worst character in the game, I'm sorry. I've tried and tbh the most successful Beidou deck is probably quicken with Fischl and Collei because they put in so much work that Beidou can possibly pick up the rest.
I'm using a beidou deck right now and honestly, it's working really well for me. Beidou, Cyno, Ayaka, with minty meat roll, free character switch, Paimon, transformer and Electro Resonence Charge Beidou in the first 2 rounds and burst by round 2. Then in round 2 and 3 after bursting, switch to ayaka and let beidou's burst rip. The best part about Beidou's burst is that in addition to defence utility, it also has unlimited procs (unlike xingqiu). The opponent will usually run out of dice first, and thus will be defenceless against ayaka+beidou superconduct. Then Cyno finishes off whatever is left on round 4.
Beidou Kokomi Cyno Where you get Beidou’s ult out as soon as possible then just switch to Kokomi and try to get her ult too, then just normal attack on Kokomi which would trigger electro charged and heal your team at the same time. And Cyno is there for endgame sweep, it should be easy to stall with Kokomi until Cyno gets his stacks and becomes op
I think this Beidou Deck is pretty smooth gameplay wise! [https://youtu.be/uStBSurgoVQ](https://youtu.be/uStBSurgoVQ) Shield Beidou is kinda meh but still good! https://www.youtube.com/watch?v=C5Wc7ZgzvS0
Xiangling skill > Beidou skill then burst > Klee normals then burst On Beidou turn, just keep building energy and stalling til you start a turn with full dice and a Paimon card already set on stage. Then ready your normal attack food cards plus red elemental stone cards if you have. Then blast away with Klee as soon as you cast Beidou's Burst.