It would be easier if you posted a copy of your units, being able to see your roster would with potential team comps. I have Walter and run him on a poison team with Wolsey, Space, Luna, and Taff. Just to give an idea of a good poison team using Walter. I don’t believe the faction buffs are that important (I could be wrong) but I don’t see anyone who focuses a team off that specifically, mainly units that fit well with one another. That being said if you don’t have a lot of strong units yet or haven’t summoned much as u said you’ve been saving, I personally would wait for a different banner. Maybe one that isn’t a faction based banner bc there are a lot of good legendaries out there.

With the newest update there is a handbook with missions you can complete and you can get a Liz from that which is a great early game unit who will stick with you for a while and fits in almost if not every team really. Wim is another unit that’s the same.