Hi Steve

I hope that I can help you.. I've only been there a couple of times..

1)Are there any variations of the regular black card?
None that I know about.. The card that I got 3 years ago was the same as this trip.

2) What is the color of the $5 Multi-Game Credit cards?
Blue.

And, are the colors always the same between type A and B?
Don't have or seen them all, but the ones I have seen are both the same colors.

3) Are there any obsolete Express cards?
Don't think so. They did not have them last trip.

4)What are the colors of the $15 and $25 Express cards?
Sorry, I have not seen either of those.

Maybe some of the other collectors have some input...