The best structure mod in Minecraft history

Yes, I will die on this hill. Sure, the default structures are nothing to gawk at, but as a dev utility for adding your own structures, what this mod is capable of is insane. Jigsaw blocks don't even come close. RC's greatest feature is the structure script block. Randomize portions of a structure on generation? Check. Create dynamic mazes? Check. Create dynamic towns with theoretically infinite unique layouts? Check. Compatibility with nearly every modded block and entity? You bet. It does lag the world a little with larger structures, but pregenerating can fix that, and most people aren't creating structures with 200k blocks.