A brief explanation of the cards can be found here:
http://disney.wikia.com/wiki/Sorcerers_of_the_Magic_Kingdom
This is how it worked last year: You can get a "starter" pack for each person with a ticket, once per day. During the parties, during party hours (after 7pm), you can get the special party card for anyone present with a party ticket. You can get them at the firehouse and another location, but I've never been to the other location and am unsure where exactly it is located.
If you have never played the CMs will give you a brief tutorial the first time. After that you just get the cards. The game is really fun, we played a lot while wasting time waiting for fast passes to become active.
http://disney.wikia.com/wiki/Sorcerers_of_the_Magic_Kingdom
This is how it worked last year: You can get a "starter" pack for each person with a ticket, once per day. During the parties, during party hours (after 7pm), you can get the special party card for anyone present with a party ticket. You can get them at the firehouse and another location, but I've never been to the other location and am unsure where exactly it is located.
If you have never played the CMs will give you a brief tutorial the first time. After that you just get the cards. The game is really fun, we played a lot while wasting time waiting for fast passes to become active.