gamechanger

/G AE1 M AH0 K EY1 NG ER0/
noun
  1. 1

    A visionary, innovative person who changes the way people think of a situation.

  2. 2

    An innovative idea, product or procedure which changes the rules of a process viewed as a game.

    โ€œImproved drug testing has been a game changer for many sports.โ€

Source: https://en.wiktionary.org/wiki/game%20changer, https://en.wiktionary.org/wiki/gamechanger