Bit more explanation of a few:
/BSD shows the 'Bricks' emote, the same one that shows up when you open the bricks GUI. (You don't normally see it because the GUI is in the way)
/doupdates will crash the server if you are the host, making all clients go to the main menu and "search" for Blockland updates.
/magicwand gives you the Destructo Wand if you are an admin.
I'd normally post the Massive List Of Server Commands which I had (taken/edited from ResonanceCascade's old "Break My Server" script

), but Truce has already done it.