There are no odd questions, only odd answers...Originally Posted by ElderGias
I would recommend only adding one of the Zombie Gamer promo cards to a game set. You may have noticed that the vast majority of the monsters in the battle deck are unique (ie. only one instance of the card in the deck). Only a few of the lower power monsters have multiples.
In keeping with this spirit, I would recommend treating the Zombie Gamers as more of a "named villain" that shows up once per game rather than as an "anonymous henchman" that shows up around every corner.
Also keep in mind that the Zombie Gamer card received less playtesting than the other cards so inserting a bunch of them into the game may yield unpredictable results.