I was looking at Philosopher's Store and saw a bunch of these different layer cards, so what do they do.

You combine them with the tokens and tinctures you buy at the same shop to make alchemy items at the Alchove! You need a zombie skin to be able to use that feature, though.

Ok thank you. Can you get zombie skin around Halloween, i dont really remember

If you don't already have a zombie skin in the beta wardrobe, then you will have to wait until February.

However, many people have zombie skins available and can do alchemy for you.