I'm a pretty new player...which think of this game as a time-killer originally but as time went on I start to spent some more time on it...So I just pulled the newest SSR(are SSR VERY rare or was I just lucky...) and I feel like it's bad....so is this team playable?

SOUL
Lancelot (I just started and is it a good idea to save up until I can buy a Legend Soul?)

KH
SSR Thanathos(I put her in only because she's my only SSR...but I feel like she's not that good...)
SR Nike (Heal...that's it....(?))
SR Kikuri-Hime (Well...there for the defense....)
SR Uranus (Atk+ and decent aoe(?)

I feel like i can replace Kikiri-Hime for Durga because she increases triple chance....idk I just need some help xD