New zombie overlord here

[StayPuft]

I see what you mean, but it sort of defeats the random surprise aspect of it if it is something the Zombie Player(s) are able to plant in the deck. For the effect to really work, there needs to be the element of surprise that you never know when it will come up.

I think it is okay if it is semi-diluted by the fact that there are so many cards in the deck. I almost think that adds to it a bit. That way, it isn't something that happens all that often. That way, when it does come up, it seems that much more of a bad thing. In fact, I almost think the possibility of it coming up a lot could sort of water it down. I kind of like the idea of it being completely random, and somewhat rare. But, that could just be me.