Recently on the Hunting Party Podcast the question was asked what the best way was to regen mana on the Lady Deathwhisper fight, Viper Sting or a few cooldowns onto Aspect of the Viper, And I thought to myself this isn't the only fight mana can become an issue (Note unless you have a really unfavourable 25 man group make up, the only times one would run into mana issues would be on 10 man).
So I'm going to go through all bosses and write up a few strategies.
First of the important thing is to look at the fight and use it to your advantage. Make use of what Blizzard gives you in each fight.
Marrowgar is very straight forward. If you should run into any mana troubles, plan ahead and before you run out use a bonestorm phase to switch to Aspect of the Viper and refill. If an MM hunter make sure you don't lose your Serpent Sting though.
In going with use what Blizzard gives you, well here Blizzard gives you big fat mana battery in Deathwhisper herself. In this fight its not about how much dps you can do anyway, and depending on what your role is it may not even matter at all. So just relax and if you see yourself dropping low in the first phase just switch to her in between the adds and pop of a singular Viper sting Chimaera Shot combo, and then continue on the adds. Make sure you have enough mana before going into Phase 2 though because this is the burn phase where you do want be able to DPS as much as possible.
Gunship is the easiest encounter in here and for the hunter one of the easiest to top the dps meter as long as you aren't jumping or in a cannon. Just Volley to your hearts content and refill in Aspect of the Viper on the Axethrowers.
Saurfang is a fight where, if you're running out of mana you just gonna have to bite the bullet and switch aspects. As a hunter chances are you'll be asked to look after the beasts (as all ranged should) and you want to dps them down as quick as possible. I suggest once the beast you were focusing on is down, switch in to Aspect of the Viper and see if you can get a few shots off, on someone elses target that may still be up. Just make sure you have enough mana before he goes into his soft-enrage at 30%, because that's when he needs to be burnt quickly.
Festergut & Rotface
Festergut is effectively a pimped up Patchwerk in my opinion, and Rotface a tweaked Grobbulus. There aren't really any phases which would be more useful for mana regen then others, so just switch when required.
professor Putricide is also a boss that doesn't really have any phases that are more suited to switching Aspects than others, but you do want to be mana up before he hits the 3rd phase at 35%.
For your average raid guild and maybe even your not so average raid guild this is going to be utter and pure chaos. You will be spending a lot of time running, you will spend a lot of time switching targets and sometimes you may be spending a lot of time dpsing Kinetic Orbs. Don't worry about what your DPS is and just refill your mana when you need it.
If this is done properly this fight will be over before you could possibly run out of mana, and if it isn't done correctly you will most likely wipe.
This goes back to what I said at the start, use what Blizzard gives you, and in this case Blizzard gives you regular Mana Power-ups in the form of Risen Archmages. So if you see yourself running low switch to an Archmage and fire off the old trusted Vipersting Chimaera Shot combo, then continue as you were.
Sindragosa is a fight where you never really want to give up dps on her, so the best time to regen is during her air phase. Switch to Aspect of the Viper, dps the ice-Cubes then switch back when she lands and be on your merry way.
The Lich King
The same applies here it does to Sindragosa, you again don't really want to drop any dps during the main phases, so use the intermission phases at the edge to switch into Aspect of the Viper and refuel. Then when you are manaed up or the phase is over and you have to run back in switch back and DPS to your hearts content.
So there you have it. These are the strategies that I use when it comes to regenerating mana. feel free to comment on them and let me know if you think there are some better strategies, I will be more than happy to update this guide to include your tips.
So keep on hunting, and next time you see the Lich King steal his polearm for me :)