Skaven Slave
Christopher
Clan Pestilens
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In the case of modern standard English, so the formal rules that are taught in school, a double negative makes a positive.
I have been a professional writer for over twenty years. I have Bachelor's and Master's degrees in English. What you've stated there simply isn't true. Double negatives are frequently criticized in formal writing because they're frequently clumsy--poor usage--but if some teacher told you in "modern standard English" there is a "formal rule" stating that double-negatives revert to positives then you have been done the injustice of terrible teaching.
Meanwhile, if you want to persist in this, I invite you to prove me wrong with a direct citation from the current edition of any respectable standard style guide (Chicago, MLA, or APA).