If you don't have Mad Scientist or Explosive Trap on turn 2, concede. Explosive Trap is better if the hero power shifts from the 3 welps to the 2 2/2's with taunt. Mad Scientist is better if it shifts to the 5/4(in which case hit the scientist into the 5/4, the trap will do the rest)
Beyond that, you just face face face. Hunter's Mark is in just in case you need to send one doggy from Unleash the Hounds into the 8/8 hero power to buy yourself another turn. Doomsayer was initially just there to fill a spot, but it saved my ass big time in conjunction with Annoy-o-Tron.
edit: If you don't have a Doomsayer, people in the comments have seen similar results using Explosive Sheep. Had I remembered the card existed, I probably would have put it in before trying Doomsayer.
Edit: Glad this is helping a lot of people.