Mixed Dragon/Armor Team - Good Idea?

I'm thinking about creating a team with Black Knight, Fae, and Nowi/Effie.

I haven't summoned a SINGLE green armor unit in my main account. As a FTP, this is the closest I'll probably get to Armor Emblem in the foreseeable future, lol.

For threats, I'm thinking Fae can handle Reinhardt, and BK should be able to handle the green mages and Hector.

I know Nowi can counter B!Lyn about 80% of the time. I'm not sure what specific threats Effie counters besides the sword lords, but I'm betting she could also counter Lyn by tanking one attack (with Wary Fighter) and then moving in for the kill in the next turn... provided there are no dancing/repositioning shenanigans going on. :P

I'm not decided on builds for anyone yet, but I know I want Lightning Breath + & Panic Ploy seal on Fae, and maybe Heavy Blade on Effie. Nowi's already mostly built with QR3, TA2, and Moonbow.

Thoughts?