It used to be that rogues had a talent that lets them see other rogues better, sorry if I'm not up on every change on every class I play (7) ....

Hunters track also puts them on the mini map and if the hunter can mark them then .... , but I dont have a hunter.

My shaman are restro and my mages are fire .... I use frost nova and arcane explosion but they are only 10 yards.

Let me see if there is a way to get a mage aoe to more then 10 yards.

Still with a lot of mirror image up one of them should see the rogue when he saps and start casting on him.