This works best against long game against a human player.
Make some cannon defence around base(inside as well)
Make a lot of dark archons that know mind control.
Get some High templar that know Storm
Make a few expendible units (zelots or Dragoons) And put them out on front of you archons and templars to take the hits.
When opponent attacks mind control all of his big unit(Battle Crusers,Carriers,maybe lurks,and tanks too)
That will really piss him/her off.
Use storm on carriers that you didnt mind contol(the storm kills all the interceptors and make it helpless) and use it on mass hydras and marines for great effect
Than attack the guy with his own units.
Biuld some dark templar and and regular rchons to switch your staregy and throw him off
If you worked well you should have no problem taking him out. Especially if he changed his strategy to get you r dark archons ant templars(get an arbitor for your units forgot to mention that)
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If you know the person you r goin' against and you know he biuld a lot of hydras dont biuld dark archond and go for regular archons with a shield battery. if the guy is terran and he just goes wave after wave of troops storm works well but get reavers and darks to help the slaughter.

CreepColony's Opinion: This requires a ton of micro managements, and since you'll have a bunch of dark archons and no real army, be very careful.