Damn, how could I forget the Mage Bane? (Amon Hotep I'm less worried about forgetting.
) I did actually open up my manual and give a cursory glance at the artifact level item list to see if the capital letters MR jumped out at me in case I forgot something, but it seems that didn't help either.
Anyway, to get back to more real targets, I'm quite confident equiping my heavy duty SC's with Starshine Skullcap, Rainbow armor and Antimagic amulet + spell of choice when in battle for a MR of 31 (27 out of battle) even againt heavy S nations. Sure, occasionaly you might loose one to a lucky Soul Slay, but it's rare enough that there always will be an easier way to take them out, and that's about the best you can ask for in this game.