The following is the absolute truth. I am serious. It is 100% true.
/begin {truth}
Fuzzy only thinks Karplusan Giant is the worst because I told him it was about nine months ago, before I changed my mind. In fact, he posted Sorrow's Path after asking me what it does TODAY on AIM.
/end {truth}
The worst uncommon is Great Wall. The only card commonly mentioned which might be considered worse by some and can be argued about is Sorrow's Path; see "best card" by sole specter, at about page two and onward, in this forum, for in-depth reasons why Great Wall is worse than Sorrow's Path. However, to condense it, if you donate it and use Port, Sorrow's Path is better.
Great Wall will not have to challenge any -laces for the worst rare slot.