His synergy only activates when he causes a debuff, and for a very short time
This means it will work on BPCW, it'll also completely bypass masochism nodes, but it won't work on Mordo's astral evade or Electro unless you use a special and cause bleed (in which case Mordo can't evade anyway) or if you're using the resonate mastery and you inflict the weakness debuff
My guess is it wouldn't work on Mordo since he has a passive that protects him from ability accuracy reduction. Blade's Danger Sense can't get around it either.
It works on BPCW. He's not the only one who can do this. Proxima Midnight can if I remember correctly. I'm sure Kabam is aware of it because that's about all it's good for.
Comments
This means it will work on BPCW, it'll also completely bypass masochism nodes, but it won't work on Mordo's astral evade or Electro unless you use a special and cause bleed (in which case Mordo can't evade anyway) or if you're using the resonate mastery and you inflict the weakness debuff