There are a few ways to approach this fight, but it really should not be too difficult either way. The opener will be the same regardless, you'll want to land a Polymorph on the Warrior and open up on him the same way you would anyone. The tighter you and the Mage time their damage to hit the better of course.

From here however there's two courses of action. You are dealing with a warrior that has a healer that can't dispel. From that initial burst it is quite likely that the Druid has burned his Nature's Swiftness. You can either continue to nuke the warrior and CC the Druid as you would in previous strats (the second he pops out Seduce or Banish, depending on his form). Or you can continue to CC the Warrior, and switch to the Druid. You will only get the Druid kill if you time your lock down abilities correctly/efficiently.

If that isn't working for you, you have room for mistake. You probably at the very least burned his trinket, on top of Nature's Swiftness from before and can then switch back to the Warrior.

Mage PoV:

Nothing special, start off with a Sheep on the Warrior to allow you and Warlock to get off some nicely timed burst, continue to nuke the Warrior, Counterspell/Deep Freeze the Druid if needed.