There is a bug in arena atm.. a lot of the wierd stuff you can gather from archaeology can be used in arena. i does say on the item. you can not use this item in arena.. but trust me it does work..
i have used Druid and Priest Statue Set - Item - World of Warcraft and Highborne Soul Mirror - Item - World of Warcraft .. both worked. i assume other items will aswell..
Screenshots comming soon