You own 1 game. All idle master does is check your account's games and idles them to obtain the cards steam gives you for free (half of a single (1) badge). You want more cards? Buy more games.

Before you ask, no adding free games will not give you any drops. If it did then the value of those cards would be less than a cent as everyone and their pet dog would try it for free money. As this is not the case it's obvious that it doesn't work.