For a BM that's worked for me so far :
-Fogged Crystal (MD target takes 90% less damage) + Piercing Scope buffs
-Soulsteel Pinion (Use Intimidate, for 6 sec 100% Crit Chance and Crit DMG)
-Sigil of Skoldus (Enemies in trap take 25% more dmg from you and pet) + Any Tar Pit buffs