Syndriq's sump allows you to pick a rule that is in effect until next turn.
One of the options is (Poison 4+).
If you choose this rule to be in effect, is it applied to any CCWs you are currently using? Or is it used in place of it?
I could see some synergy with the Mindphase gauntlet in that it would give a +4 Concussive ccw, but that's about it...