Elixir of Major Mageblood

This regenerate a total of 11520 mana while it is active.

Most raid-boss fights in Karazhan last at least 3 minutes or so, in 3 minutes, this elixir will give you a total of:
576 Mana

Compare this to the 30 Int from an Elixir of Draenic Wisdom, which will give you a total of 450 extra mana pool.

Boss-fights only get longer from there.

Keep in mind that many classes get extra healing/damage from the additional spirit/int from the wisdom elixir, but for pure-mana, Mp5 is king on long-fights.

Here's some mathcraft for you guys.

The following calculations are an effort to find out which would be a more desirable stat based on the length of combat (Intellect VS. Mp5)

Comparing Elixir of Major Mageblood to Elixir of Draenic Wisdom.

30 X 15 = 450
(This is to turn intellect into raw mana)

450 / 16 = 28.125
(It takes 28.125 ticks of 16Mp5 to equal 450 mana)

28.125 X 5 = 140.625
(This is converting the 28 different 5 second increments into 1 second increments)

140.625 / 60 = 2.343
(This is converting seconds into minutes)

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Elixir of Draenic wisdom is more efficient for fights lasting less than 2 minutes and 20 seconds, and Mageblood is more efficient if the fight is longer than 2 minutes and 20 seconds :)

I didn't want to fiddle with the spirit on the Draenic wisdom elixir concerning how much Mp5 it would grant... But in general if the fight lasts longer than 2 minutes, Mageblood elixir should still be better than Draenic wisdom, even for you priests, druids, and mages out there ;-)