Hi Jim,
You must have kids, or you got it from one...
They transferred the arcade to MGM Grand, and supposedly the points also. MGM was going to issue a card of their own, did they?

New York New York's arcade has a paper one, looks like a business card with person's name on the back. Boomtown in Verdi (Reno) also has a club in their arcade...

Another collectible, even if you don't have kids!

Larry