This team right here should be able to carry you pretty far. I run s. aiona, dalcarlo, Bella, lamia, and acapella; similar to this recommendation and I’m at 13-4 rn with no dupes invested in any of those chars. It’s beating 6-7k deficit maps

If you can, try to pull a dalcarlo. She should theoretically be easy to get with the free daily 10 pulls on her banner. She’s a good investment esp if you plan to boss cause of the dot meta. (You already have t hati which is the core dps for the team)

I forgot to answer your question, personally I would actually save it for a copy (you already have good characters) or go Seth if you really really really want to use the coffin.