Am I the only one having severe mana issues as Oracle Disc Priest?
I find myself having to stop constantly inbetween pulls to drink in dungeons, even just doing my DPS rotation at the dummies while keeping 1 single atonement up eventually drains my mana, let alone if I have to PW:Radiance or SMend somebody.
With the Pet Build you shouldnt run out of Mana much in Dungeons (as you will aim to snipe as many 20% trash mobs as possible with SW: D). Regularly using Evangelism to spawn the Mindbender also helps tons with Mana. Also communicate with your tank if you feel the need to sit down. I have a Macro that i press it yells âNeed mana please wait a few seconds!â works like a charm.. 
I mean if you didnât eventually run out of mana what would be the point of mana. Make sure youâre doing your rotation correctly, learn to drink in between pulls or before boss while your mana is relatively high to stay capped.
You are talking about mana like weâre still playing Classic. On retail, mana is supposed to be this limit that prevents you from spamming healing abilities non stop, you are not supposed to go OOM just doing your DPS rotation.
Plus Disc is the only healer currently suffering from this, unfotunately these kind of mistakes happen every time, I remember back in the day HPal was going OOM by using Crusader Strike lol.
Imagine if R.Druid was going OOM by using Rejuv and Lifebloom on the tank and then doing the DPS rotation, it would be stupid as hell, well, that is Disc nowadays.
I dont know WHAT you are doing wrong but you are doing something wrong. I dont go OOM in a 7 minute Bossfight while using every GCD to heal or do dmg (or in Discs case.. both 
). What build are you running? Are you using Mana Pots?
Iâm using the standard m+ build with Eternal barrier and pet talents.
Overall weâre mana negative but there are ways to mitigate it. When talented for getting mana back with pw:s it costs about as much as a smite(which is mana positive) That and using penance on an ally is a small damage loss but also spreads penance to your team. Knowing when to penance an ally or enemy is probably the single largest thing to help your mana economy. I find plea genuinely useless outside of raid and just wastes more mana than its worth. Use sw:d as often as possible for its heal and mana regen. Remember as an oracle pw:s is NOT one of your primary heals. Its a mitigator and atonement spreading tool. A well timed void shield is great going into a tank buster or to help a dps about to take a big hit but an unbuffed pw:s should only be used to save a life where a gcd spell would take too long to prevent a death. Its cost to value ratio is much lower than flash heal.
I had problem with mana when i used evangelism as an ââoh sh*tââ button, now i use it as soon as the group start to take damage and i donât drink much in dungeons.
donât say that to a DPS 
ubuff shield is so weak itâs almost pathetic to use lol
If it crits its ok
Otherwise itâs about as good as plea lol
I never feel OOM as Disc, but Holy is another story.
Iâve been trying out a slightly different version of the shield build with all the left side of the tree (except the smite ones) to see if thereâs a way of making this build work while stemming the mana useage somewhat.
I dropped shadowtap (the +150% damage and +40% mana cost on mind blast) to instead run 2/2 harsh discipline. I also picked up revel in darkness (Lets you spread SW:P a third time) to try and maximise the chance of getting shadowmend procs. There was also shield discipline and 2/2 blaze of light.
I ran it earlier in just a 12 AA to see how it felt. In dropping shadowtap, mind blast does basically nothing for damage (like it goes from doing around 20ish k by default to around 6) but it does still trigger power of the dark side (the +30% boost to penance). Takes a bit of getting used to. Mind blast kinda becomes like a combo spell you cast to get a harsh disc buffed penance to go crazy. (if it crits)
I found that I actually didnât need to sit and drink as often as I probably wouldâve done (still ended up almost ooming during the last boss) and I actually found myself with a lot more mana than I had been expecting a lot of the time
Who knows, maybe dropping shadowtap might be someway to salvage the spec after next weekâs nerfs.
left side is fun. i switch between that build i made and the standard m+ build.
itâs nice because that weal talent gives 30% extra shield and thats pretty good on a void shield, even better when used on yourself.
the only thing i did differently was grab shadowmeld for the extra heals. itâs fun when your feel like you want to play more passively but then youâre really fishing for procs still lol.