I played the wizard guy who starts with Tandis. I only had one city for quite a while, but was busy hypnotizing various minions to build my stack of doom (I don't think they cost logistics, do they?)
In my first game with the new laptop I played the guardian gal and had plenty of spells throughout the game, although I quit a little early as I spread my forces out too far without cloudwalk... So love the spell randomization part of this game.
But I didn't really adjust my mana much... although I did spike it to max mana for a bit to replenish my pool for some hypnotism spells. Did I research more higher level spells that exhausted my research pool? maybe...