"Your soul is mine" is most strongly associated with Shang Tsung in the Mortal Kombat series, where the phrase became one of the character's signature taunts. The line spread widely through fighting game culture, then into meme videos, reaction edits and short-form content. People keep using it because the meaning is instantly clear even without context: one person has utterly defeated, claimed or humiliated another. Its dramatic delivery gives it the same quick payoff that makes clips like the bruh meme last online.