I've been wondering the same thing and considering approaches (since I love C'tis).
It seems that you pay 200 to get:
-nasty declines in your population
-to pay gems instead of gold for priests
-VERY nice Tomb Wyrms for free each turn from the best summoned priest (that are sacred)
-a super powerful final hero
So, I guess, like licker said, it would be about summoning the kings as much as possible by finding death gems, pumping out the wyrms and Sauromancers, blessing the wyrms with a nice buff, and setting +3 luck to get the super hero fast.
Magic? Anything that helps supporting or summoning of undead to join your vast reanimated hordes.
Not sure the advantages are worth +2 death and 200 points, but I plan on more testing along these lines to find out
[ January 26, 2004, 18:54: Message edited by: diamondspider ]