Suggested changes to Mana Costs and Mana Regen

[Enginseer-42]

If we're going to bring OOM back, perhaps something to keep it from being totally crippling but still a severe disadvantage? If you go OOM you can still cast but it reduces the damage of any spell where you can't 'afford' the mana cost by a significant amount?

It's not fun being able to do nothing at all.