This works best if you are level 61-mid 70's.
I used search and nothing came up, I tested this on my level 71 holy paladin using "Holy Shock." So far I believe this only works as a paladin.
There are two easy steps to doing this:
1. Get the trinket Auslese's Light Channeler - Thottbot: World of Warcraft from blood furnace.
2. Make a paladin and use Holy Shock.
The buff does not go away when you use Holy Shock, so you can get 2 holy shocks off in this time saving 430 mana, and then still have time for a third heal to save 645 mana.
Really helpful for leveling, hope you enjoyed the post. This also works with offensive holy shock and judgements.
EDIT: Added a screenshot
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