Mana sustain requires more than just totems. Innervate is a great tool, on top of providing BRes, and Shadow Priests also provide Replenishment.
Mana tide is a cool down and arcane drains so much Mana that on some fights they need to be rotated into another Mana tide
In TBC the set bonus is 20% increased damage and mana cost, not 5%.
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wowzers 
It was prolly already mentioned but that bonus is actually 20% in TBC.
You use that 2 piece set all of TBC even in tier 6.
Also on private servers like I said the boss’s health is buffed by a lot so they needed more babysitting there but on live I doubt they will as much because bosses are going to die pretty quick.
Some of those 6 minute boss fights which is on the high end will probably only last 3 minutes in classic.
Typically you will always have a shadow priest with them and an elemental shaman.
now I’m just speculating here but I think they will become the top damage or at the very least competitive for it.
Incoming where people roll the Flavor of the Month
Not me I will be staying mage.
But I think mage will be competitive for top damage anyway
if we get to copy our classic characters to tbc, i will also be staying mage. but plan on leveling a gnome or human lock, a draenei priest or shaman, and a night elf hunter. .maybe a night elf or human shadow priest. haha. not ambitious at all. oh oh and a night elf druid
Lmao in BC Fear has no DR so you fail in many accounts of warlocks being sitting ducks you got a trinket and maybe a iceblock and passive then your stuck feared till your dead while locks laugh at u