How does MRoC SS work?


I got my #1 pick from the featured in my 3rd crystal after a new Yondu and new Iceman, but no I’m realizing that the whole storing and activating makes not a lot of sense. Can anyone who is good with her give me the rundown on how her playstyle works? Does she need her sig? I don’t see where additional AA comes super in handy (and the other increased effectiveness is nice but is it needed?)
Thank you in advance
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She is tricky, Max MD helps her very well, she works against non buffs champions as well. But against champions that have buffs she butchers them. She mostly shines in long fight like act 6, abyss,labrynth and maybe AQ. She is good in short fights as well but not very effective.
Also less important, slow reduces AA of unstoppable and evade stuff by 100%, so do two stacks of slow reduce it by 200% in case the defender has increased AA?
@DalBot i saw you had Kali at 6* r3 (saw ur epic champion solo too), so maybe you could answer this?