What team can I make cause I'm limited so I need some pls

What are the IV's?

Eirika + Nino seems like a good core, make Eirika a quad buffer to abuse Nino's Gronnblade damage output

What about Xander, Brave Lyn, and then Raven Tome/Triangle Adept Nino. It's not the most common Nino build, but she should be able to deal with blues and the common onslaught of Brave Lyns in Arena. Lyn will be able to nuke mages and take out DC reds (so long as you don't take Sacae's Blessing off of her!) for you, and Xander will kill every green dead that causes you issues.

I'm basing this on the TA Xander, QR Fae, Reinhardt team that has carried me to tier 20. Since you don't have a Reinhardt, it's a bit different.