its a VIACard.... kind of the low tech EZPass in Italy. Think of it as a temporary credit card for paying tolls, gas, and such.

Here's a writeup that should explain it better than I can

http://www.vialtis.com/us/gestion/viacard.htm

Its not uncommon for these types of cards, along with telephone cards, and even GSM sim cards to sell the advertising space. And if the product (like a telephone card) is aimed at a traveler, its a good opportunity for casinos to advertise.