I had an idea for a build in PvZ but I don't play Protoss.
The idea is that you open fast expand (nex first or ffe) then go super fast DTs to keep 3 hatching Zerg players contained/do damage. The DTs need to be controlled well since you can't lose them, the aerg should only really have spores for detection at this point as it will hit before standard lair timings so with good control you shouldn't lose them. Then go straight into phoenix production and control the map with DTs and phoenix. Taking a 3rd behind this and planning to defend with DTs/zealot, killing overseers that push out with the army with your phoenix so that the DTs can defend. Then eventually going into Archon Chargelot - a really strong unit comp.
This build would require extremely good unit control as the DTs are so valuable. Would also need really good map control with the phoenix as you need to start working on those overseers as soon as they start to push out with their roach ling to deny your third.
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