you with Pain Inverter (Assuming you have GW:EN) with a full team of henchies, and a Spoil Victor Necromancer.
I think you can take an SS Necro not sure about this one though.
Whenever I take on Shiro I equip pain inverter and wild blow take an ss and sv nec hero, along with a monk hero (hero's cannot be banished). Then just sit back and watch Shiro kill himself but be sure to use wild blow to cancel battlescars.