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.
Strix's stealth can make him harder to track, so toss your Sensor Drones out where you expect him to be and reveal him to your team. If you run the Booby Trap talent, the explosion of your drones can disrupt his aim or throw him off of high ground.
If you have several totems down and Willo hits you with Dead Zone, you can use your Ghost Walk to briefly cleanse the effect and continue to heal yourself.
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.
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.