cube of discovery

Hey, I got my first Cube of Discovery and I wanted to ask if someone who already got and tested it can recommend me how I can use it effectively. Should I use it while im grinding neltharions lair or is there a spot to gain more ap from?

A couple of days (weeks?) ago, a new item was added on the PTR. http://ptr.wowdb.com/items/153127-cube-of-discovery Cube of Discovery Item Level 110 Binds to Battle.net account Use: Allows you to sometimes find artifact power items when looting enemies. Ineffective above level 109...