Using Mind of Void (Expansion 1) keep in your counterspells thin out your deck to the best of your ability otherwise. Play against Sarkhan the Mad. Not only will this result in some fun gameplay, it's the best way to achieve this achievement without the boomerang trick.
Sarkhan has three Eldrazi in his deck and your milling him will result in a lot of deck shuffling as they come and go. But Sarkhan will filter his own deck to get land on the battlefield and play an Eldrazi. Once he plays either Ulamog or Kozilek, use Persuassion to take control of it and start swinging with Annihilator 4 going the other way. This is tricky, but I found it easier than using Eons of Evil where you only get Annihilator 2, and the AI seems willing to just die rather than chump block enough times for you to destroy all the lands.
Important tips: Use your Counterbores on the removal spells like Terminate or Sever Soul, this removes them from the game and means they won't come back to hit your Persuaded Eldrazi. Dragonmaster Outcast is fine as long as it's not his first play, when I got this achievement that was his last chump blocker and I didn't have to worry because he never got too many extra dragons in play because he was sacrificing lands too fast. Giant Scorpion can also be a problem because it has deathtouch. Use your counterspells wisely and carefully.
You only have two Persuasions so this method requires both luck and skill.