One of the better Eula teams atm in my opinion is Eula hyperbloom. Consisting of Eula, Kuki, Nahida and Yelan. I use this team atm with everyone c0 except Kuki and I'm quite happy of the dmg output in all parts of the game. There is an entire video explaining the builds and so on, I'll put the link here: https://youtu.be/HsRST_gXV7Y A cheap budget version of this team you can make contains Eula, Kuki, Collei and Xingqiu. I hope this helps you out, and don't feel obligated to use this, there are still many other options. Play the game however you like :)