To my knowledge this only applies to Mastercard World Elite level cards, not to all Mastercards. (World Elite airline affinity cards are also excluded.) There is no requirement that all VISA Signature cards include Priority Pass. If it isn't specifically mentioned by the card issuer it is probably not included.

There are several levels of Priority Pass membership. The least expensive one which is typically bundled with low annual fee cards requires payment of a $27 per person fee for each lounge visit.

If you prefer the version with unlimited visits, I suggest this thread:

http://www.flyertalk.com/forum/other...meriprise.html