So, i don't recall seeing anything similar to this on these boards, or any other.
This trick is pulled using the following units
3 Wracks
Baron Sathonix
10 Mandrakes - one a Nightfiend
10 Mandrakes - one a Nightfiend
First and foremost, you should deploy the Mandrakes inside cover and 12" apart from each other (better yet on dificult terrain, like woods or wrecked buildings). You start the game with Baron attached to the Wracks, then you fly away with the Baron carrying the pain token directly to a Mandrake squad. Poor Wracks, now they have no pain and only a 6+ armor save
The baron is formidable, he has Phantasm Grenade Launchers, ShadowField and Master of the Skies so no problem landing on dificult terrain.
Now the Mandrakes can shoot. The Other unit of mandrakes goes to ground if necessary.
From now on the Baron is the "Messenger of Pain", and goes from Mandrake to Mandrake carrying the Pain Token allowing the Mandrakes to shoot and pin.
If the Mandrakes find Melee, that's ok because they can hold their own, the Baron can Hit and Run if engaged and will deliver the Pain Token to the other unit to keep firing. If pain tokens are gathered the Messenger stays with a unit and move forward looking for a fight (remember, now the unit has
PGL and a tough leader)
This is one, of many, ways to use Mandrakes. I hope you liked the trick. I also hope its good enough to make people start using them!!