1. Why would you call specifically for Oella to be given a protected buff?
2. If your question/suggestion is to generally make RES up protected, why would you think that RES up specifically is more dangerous for Mischief to steal than, say, block damage? Or ATK up? Or any number of other buffs?
3. Why are you running a team against Mischief that doesn't include someone who can either place block buffs, or run enough RES to resist the steal and have a high-enough chance to be targeted due to self buffs?

I am refering to Oella, because this is what makes her kit Unique, and has potential to make her vailable, however if she has that buff stolen, and people cant land attack down debuffs, it could essentially be a wipe on that 1 mechanic.