I think she is good in the right rulesets when you can take advantage of the heal ability on Grim Smith in particular.
But most of the rare summoners are completely outshined by the dual-element legendary summoners.
I would rarely select Avina over Tofu for example.
Yes, I agree. But those legendary summoners are very expensive, as always. 😅
I got all of mine as airdrops from the battle wagons.