This can be a difficult combo if you let things go their way. Start off by going to a pillar and dropping a Snake or Frost Trap, and a Flare. Stay by your Flare, but have your Druid go off to a near spot, still in your LoS. Keep Vipers up on the Priest and Silence him whenever the CD is up. Of course, save your Scatter Shot for the Rogue.

If they go on you, distance yourself from the Rogue as well as you can. Keep a Flare on yourself or where you're going, Wing Clip spam the rogue, and try to get away with Abolish. When they're on you, only use your trinket if you're below 60% health and you get caught in a 5 second Kidney Shot. Damage the Rogue while draining the Priest. He will be OOM very rapidly, and if you survive about a minute, you'll have won because you survived the Rogue's cooldowns. The only way this team can kill you is if your Druid gets caught in a bad Silence, timed with cooldowns, and dispel spam from the Priest. Oh, or they can have T6 and Warglaive of Azzinoth - free wins for them.

If the Rogue jumps on your Druid, who is near you, but not on you, open up DPS on the Rogue. Continue to do the same thing with the Priest, but drop a Frost Trap on your Druid, and if he gets low, Silence the Shadow Priest and Scatter Shot the Rogue so your Druid can get away and heal.

Druid Perspective:
This fight can be the hardest or the easiest, depending on how much PvE gear they use. Again, like the other fights, if you need to pop before their Rogue does, you need to HoT/Abolish Poison yourself first. If you don't, and you trinket their Kidney Shot, you're setting yourself up for a Blind-Sap->Fear->Silence->Chastise combo in which they kill your Hunter. So do your best to avoid letting the Rogue open on you.

If they're on the hunter:
Like all double DPS, you need to communicate your positioning to make sure that you're behind a pillar and in LOS to CC Rogue/heal your Hunter, while out of LOS of the Priest so you can't get Silenced.

Rotate cyclones if you can. The Priest needs to be kept occupied so he doesn't Purge off the Abolishes, so your Hunter needs to help out with Silencing Shots when his health is getting low. Keep Abolish Poison up, along with a triple Lifebloom, and just stay alive. The Priest will go OOM shortly, and then the game is in your pocket.

If they're on you:
Stay on the trap. They have no real way to keep the Hunter CC'ed, as long as you stay on the trap and pillar kite you can almost always survive their rush-down. Your Hunter should be helping out via Wing Clips, but I found that if they go on you, it's an easier match.