in S7 we have seen a revival of the support wizard, and since no one really seems to talk about it and I played it for a bit this season, I decided to make a little guide for it. I tried to keep it short and concise, both the written and recorded parts. I recommend watching the video (9min) to see how it works in action, the main aspect (Ranslor's Folly pull) has a very unique mechanic that is easier to understand when you see it.
Support Wizard is generally used as the second (with Monk) or third (with Monk + Barb or DH) support in groups and can have a big impact especially in open, dense or dangerous rifts if played correctly, however you need to cooperate with your group a little bit more than with other support classes.
Energy Twister - Wicked Wind (Ranslor's Folly trigger, Gale Force's 15% additive boost not really worth for its inconsistency with pulls)
Slow Time - Any Rune (we have all with Crown of the Primus)
Frost Nova - Bone Chill (33% additive for 2sec)
Explosive Blast - Chain Reaction (damage red with Orb of Infinite Depth and for proccing Conflagration)
Black Hole - Event Horizon (remove elite affixes, can be swapped to Wave of Force - Debilitating Force for damage red and globe spawn with Solanium)
Teleport - Safe Passage (or Wormhole without Cosmic Strand)
Evocation, Conflagration, Unstable Anomaly I would consider as mandatory passives. The last two slots go to Cold Blooded, Blur, Galvanizing Ward or Illusionist.
3pc DMO + RoRG, Crown of the Primus, Illusory Boots, Ranslor's Folly + Strongarm or Nemesis (cube one, equip other), Aether Walker, Orb of Infinite Depth + Cosmic Strand (cube one, equip other), Obsidian Ring, Oculus Ring, Aquila Cuirass, String of Ears or Vigilante Belt if you feel tanky enough.
Hellfire Amulet is recommended but not a requirement.
Stack CDR on every piece, after that RCR. A little bit of IAS, CHC and ApoC help but is not really required, stacking defense is viable too.
Legendary gems are Toxin, Gogok and then either Iceblink, Esoteric or Moratorium.
The playstyle is fairly simple, keep up your Orb of Infinite Depth buff and then, most importantly, you are there for pulling monsters together with Twister + Ranslor's Folly, and after that you stay in the fight, buff/debuff and remove dangerous elite affixes with Black Hole. Make sure you always have a Slow Time bubble up, especially after entering a new floor, otherwise you lose the DMO 4pc bonus and risk getting oneshot on some pulls. If you don't have a Barb in group, you should also try to pull monsters either via body pull or by using Ranslor to get them closer to the fight or through corridors, doors, etc. Consider watching the videos to see a bit more of the gameplay.