Game changer

I am given to understand that many people watching the presidential debate tonight will be looking for a game changer. If I trust the commercials that appear on my television, nearly everything these days is a game changer. “Game changer!” I think it’s time to constrain the use of this term:

game changer /ˈgām-ˌchān-jər/ noun
: one who abandons one board game for another in an arbitrary, capricious manner

Example sentence: Kyle invited us over for a game of Clue, but then he wanted to play Uno, and now he wants Trouble. What a game changer!

[Pronunciation borrowed from Merriam-Webster.]