I play as Grim Patron Warrior:
Option 1: Highest Success Rate
- Use Warsong Commander + Grim Patron to hit Boom Bot to multiply.
- Depending on luck, if the bomb explodes for 1 damage on the old or newly spawned Grim Patron, it will benefit you by multiplying. 2 damage on the new Grim Patron is also good. Killing your original Grim Patron or even the Warsong is fine. Face damage to you is also good provided you survive. Worst case is if it kills your newly spawned Grim Patron.
- Use Whirlwind/DeathBite's deathrattle on opponent's face to multiply your Grim Patrons and execute Dr. Boom. If you do not have execute, then DeathBite + last Grim Patron on Dr. Boom which is not the most ideal.
Option 2: Medium Success Rate
- Big Game Hunter (BGH) to kill Dr. Boom and Whirlwind/DeathBite deathrattle or vice-versa. The latter will have a lot of face damage but retain your BGH. So depending on whether you are near lethal.
Option 3: Lowest Success Rate
I tried Grim Patron and Whirlwind multiple times before. Not as successful.