This strategy is kinda hard to make but can be very annoying.. Here is it's core:
You need few master warlocks with the resurection ability and the dragon guy makes mass samurais.
Now charge with the sams (using DS to ensure all of them are into the melee) until they fight pass with the MW and when the most of the corpses are still visible use their ability they are resurected on half HP and can die again causing a seppuku after seppuku.... and if Otomo is fighting MW regain stamina and it is a dead circle
There are many variation with this strategy