In MONOPOLY Poker you use street cards to update the street tiles on your boardwalk. Street cards can be collected from three different card packs: Classic Pack, Golden Pack and Diamond Pack. Each pack contains 5 street cards. You can open card packs in your inventory or directly on the Boardwalk.
On the Boardwalk different street tile colors have different values and therefore some street cards are more valuable and rare than others. In the following table you can see the different card packs and how likely it is that they drop a street card from a specific color.