You want a good condi thief build?
Invest in PVT gear. 30/0/15/10/15. I believe you need runes of the undead (or whatever tune gives you +condi dmg and +toughness). Use the SB. Have caltrops on dodge. Equip caltrops, spike trap and slake venom (one with torment) and dagger storm. Lay a poison field. Cluster bomb and detonate above targets head to give 3 stacks of bleed and weakness. Apply torment and dodge roll/caltrops to cripple them in poison field. Lay down trap when you need a kd and rinse and repeat. Works amazing as a condi build – they all melt in PvE. Trash and vets alike
