The line comes from Warcraft 3, where the Spell Breaker is a human unit trained to resist and steal enemy magic, so a line about smelling magic fits his role perfectly. The clip circulated through game quotation collections and soundboard sites, where players recognised it from long campaigns against spell-heavy opponents. It remains useful because the phrase works outside the game too, turning any hint of trickery, power or mischief into a light, knowing joke for fantasy fans.