Mana blast is extremely overpowered. Keep that in mind, it might make the game too easy.
But if you really want it to be in every game, it's an easy mod. I don't have the core game files handy, so I am going on memory, but you would just create a .xml file like this, and put it in the mods folder:
Code: xml
- <Spells>
- <Spellname="ManaBlast">
- <UnlockswithTech>BookOfMastery</UnlockswithTech>
- </Spellname>
- </Spells>
This would make manablast unlock with the Book Of Mastery tech.
The unlock tag and spell names might be off, going from memory, but a quick check against files in corespells.xml will correct them (maybe sjaminei can correct me?).