MapleStory : Path of the Hunter...?

Question. If you already have a card, can you still see it getting dropped and pick it up again for null effect? It would be way better if you don't see it drop anymore once you have it, so other people can also pick it up. I can see people with Chaos Zakum cards picking them up again, not letting others have the chance.

It is only possible to pick up one. After you pick up one, you will never see that card drop again.