I guess that a support pvp warden is not really common, so, there is not any checked build that works efficiently.
The good new is that you can do your own build and try to improved it in relation of your own playstyle
I im a firm believer that one advantage of the supp warden is its heal capacity and its sustain. So, my build had many heals.
That and its bunch of CCs could turn a fight in our favor.
At least; that is what i think. And that's why is very funny to play supp warden for me.
I will link my build. If you are interested
https://alloder.pro/calc-en#d$egpso01g7g…70v0s0u::13ydj3