So if you have attempted this then chances are you have had a lot of difficulty and been struggling with it. At least I have. Then I ran across a player that worked my pets over like punching bags and decided to run it with a substitution. It has been extremely successful for me. Here are a few variations:
Original Team:
Unborn Val'kyr 2/2/1
Mechanical Pandaren Dragonling 1/2/2
Darkmoon Zeppelin 1/1/2
The player basically came at me with Curse of Doom, then Haunt. That gave them a free switch to the Dragonling for Thunderbolt to do excellent aoe to my back-line pets. It's extremely fast too so they simply used Decoy and then Breath to finish off another pet. By this time CoD went off with Haunt and it killed my other pet. It's a nasty hit. Same goes for Zeppelin. It isn't as fast as the Dragonling but it has the bombing run, plus the block from Decoy. Interesting to note, the Dragonling is actually a great counter for the Zeppelin if you come up against it because Thunderbolt does extra damage against the Zepp.
My Team: (I have yet to lose with this team. Had a couple scary situations but play smart and you'll be fine)
Unborn Val'kyr 2/2/1
Mechanical Pandaren Dragonling 1/2/2
Clockwork Gnome 1/1/1
My beginning is usually the same with the CoD and Haunt. Obviously if their first pet counters undead, don't start with her. Then depending on what they bring out I'll go for the Gnome or Dragonling. The Gnome's turrets are strong and if you're up against a tanky pet that puts out weaker damage you may actually have time to heal up. I was able to get off a full repair against a Son of Sethe. The Gnome is also surprisingly fast. Same strat of using the Dragonling to spread the aoe and Decoy.
Third Variation:
Unborn Val'kyr 2/2/1
Mechanical Pandaren Dragonling 1/2/2
Mechanical Pandaren Dragonling 1/2/2
I have not tested this one myself but thought of it as I was writing this up and thought it might be a possibility. It would provide excellent aoe damage and give the blocking abilities. Even though Decoy has a long cd, Breath is a very heavy hitter and both Dragonlings would provide a lot of speed.
Hope this works for you!