Start with Sacrifice on your Mage and try to find the Rogue. The most reliable way of beating this team is to kill the Rogue while the Priest is Sheeped. Try to pull the Rogue away from LoS objects (Pillars and such), thus pulling the Priest away as well and allowing for him to be CCed. You must stun the Rogue to do significant damage, so try to time a Shatter burst during the stun. If the Priest is not CCed, don't try to stun. The most critical part of this match is at the beginning, so make sure you and your partner do not get dispelled up by the Priest. If the Rogue is hiding at the beginning, your Mage can Sheep the Priest and try to Shatter him to waste his Pain Suppression and other cool downs.