in battle, about 100 druids passed on their doubled magic, barely enough to transfer at least as much as the hero's knowledge.
and in the end, I saw this thing
122 magic points for an elf hero!
I've seen Phoenix, and not just him...
105 druids, you could get 13*7*2=182 additional magic points, as long as all 7 stacks are alive. And if it doesn't sum up (I haven't checked, I don't know), where did you find the Magic-Knowledge parameters of 66-56? No day without a boost?