Always try to keep the Torvald occupied. Your Totemic Ward counters Nullify and his Ultimate, and chances are, the Torvald will cast his ultimate as you and your allies are in range of your Totem.
With the Treacherous Ground talent, you can prevent Grohk from using his Ghost Walk. With moderate levels of anti-healing, you can potentially kill him even through the healing of his totems.
The educated Strix player knows not to attack you when you're in Counter. The key to getting him is to fight fire with fire and be as stealthy and sneaky as possible; and be ready to react when he inevitably pulls out his sidearm.
Pip requires investment. Jack of all trades, master of none. Mega Potion Pip? Put every card you can into Healing Potion. Catalyst Pip? Go for the Weapon or Explosive Flask cards. This will help make Pip's objective clearer to him and his team.
Yagorath is the largest target in the game. You can shoot your Fire Spit and let it hit her directly for a significant damage boost. If you combine it with the Fusillade talent, your rockets will be able to overpower her natural damage reduction.