50% SA2 is too little for too much cost (200k coins per node plus a lot of skill points) when, as you mentioned, there’s chaos banish special move (which comes in all flavors, even bronze!) with a 100% certainty to work and even apply heal block. Or a silver character (purrfect dark) which is much, much cheaper to upgrade and can permanently curse opponents after 10 seconds. Or a lower tier eliza (red velvet) who can sekhmet hex for a 100% certainty.
Compare with (what little i’ve seen) other natural diamonds which can disable bb’s by mere proximity, drain life, and even make you lose huge chunks of hp by simply blocking your blockbusters.
And what you get is meter gain? Pffftt. Even bronze beat box can gain 25% meter by using a special move. Or a gray matter cerebella who gives extra meter to teammates, and so on.
To make matters worse, that SA2 is dedicated to opponents who actually gain buffs, against those who do not gain buffs throughout the match the SA2 is non-existant.
No, her signature abilities are quite mediocre and way too expensive for such mediocrity.