This is ridiculous. Saying playing cards are evil is just another example of legalism. If people are going to go this route, they should at least be consistent. Perhaps shy away from Christmas and Easter too? Both of these holidays actually have pagan origins. So do birthday candles on birthday cakes. And for the record, I didn't get to celebrate Christmas or Easter, or have birthday parties with candles on my cake, when I was growing up for these very reasons. My parents saw these things as evil. (They apparently didn't know about the evil of playing cards....
)
A Christian is free in Christ. We are not bound by a bunch of external rules. If our conscience truly bothers us in regards to certain, non-doctrinal practices, then, by all means, we shouldn't engage in these practices. But that doesn't give us the right to limit others' freedom. The apostle Paul talks about this in I Corinthians chapters 8 and 10. Basically the gist of it is: if your conscience won't allow you to do something, then don't do it, but don't impose that limitation on someone whose conscience is not bothered; likewise, those who have freedom in a certain area should not use that freedom in the presence of a weaker person, so as not to cause them to stumble. Neither the weaker nor the stronger should impose upon each other, but instead prefer each other in love.
So if someone doesn't feel right about playing cards, that's fine. The loving thing for me to do is not play cards around them. But the loving thing for them to do is not tell me that I am forever forbidden from playing cards.