Hathor

You're talking about Hathor, right! I totally get wanting to use her because her visuals are so amazing. She seems to shine in specific team comps, so I think she can become a reliable ally with a bit of effort!

I don't think I see them much in the higher ranks. Cordy and Florence are definitely strong among the permanent characters.

If the enemies in the yellow tower have healing abilities, you can poison them to death, so it's surprisingly effective. ...That is, if you don't have the recently overpowered pickup characters, of course.