the.com/game changer

means An innovation, event, or decision significant enough to overturn the existing rules of competition and force everyone else to adapt.

from Born in the language of sports and games, where a 'game-changing' play literally shifted momentum or outcome mid-contest. It jumped into business and tech jargon in the late 20th century, especially through sports metaphors beloved by strategists and marketers, and by the 1990s–2000s had become a stock phrase for any product, idea, or move claimed to redefine its field — often by people hoping to talk one into existing.