I did not read the description to the stone sword closely enough when I equipped my destroyer of worlds with it. He was awesome for half a dozen battles then is luck run out, he only had MR 20'ish. Talk about dicing with death...
The Sickle Whose Crop Is Pain works well as a Thug weapon, and the free death gems are a nice bonus. However, I think it's a bit underpowered as a SC weapon.
How about The Sharpest Tooth? It seems like a great weapon for an assassin or a Thug, but maybe not for a SC....