WOW Quest:Darkmoon Nobles Deck (13326)  

You're able to choose between 4 versions of the trinket that have either 90 str, 90 agi, 90 int, or 90 spr and they all share a proc that increases whichever of those 4 stats that you have most of by an additional 300. So for instance if you were a tank that took the agi one for dodge but have much higher str than agi, your proc would be 300 str. It could potentially cause a lot of headaches for classes that have two stats at similar levels but the higher one changes once raid buffed. The proc rate appears to be 100% with a 45 sec internal gcd giving it a 33% uptime or in other words ~190+ of the stat over time.