got this during an ubrs run, rolled need, and got it. it has less than 1% chance to drop and the proc is fun as fuck.
Taken from
http://wow.allakhazam.com/db/item.html?witem=12592
"The different procs: [note, all the buffs are able to be cast on anyone of any level (in the same party/raid) EXCEPT the +50 to all stats]
Flamestrike (90-150 fire damage)- breaks sheeps/shackles/saps
AOE Mana and Health Over time (50 every 5 sec for 20 seconds) *stackable*
+50 to all attributes for 20 seconds *stackable, mwuahahahaha*
AOE +25% attack speed for 8 seconds *stackable* - had +50% speed at one point
AOE slows enemy movement speed to 50% for 8 seconds
AOE Stun for ALL enemies for 5 seconds "