Rend was a lot easier than General Drakkisath. The best way to go about this fight is to get Mad Scientist or Explosive Trap. Rend will generally go at your face, and he always hero powers before attacking so as long as he hits the 2/2 minions consecutively you’ll clear his board and be able to assault his face. Mind Control Tech can be great to steal one of his bigger minions or just swing the board back in your favor.