As part of the project to upgrade the Manager to 1.5 rules and assets, I ended up having to vector a Special Showdown logo/icon.
Here is a large PNG version of it:
Download the AI file here: http://kdm-manager.com/media/special_showdown.ai
Download the PNG here: http://kdm-manager.com/media/special_showdown.png
For bonus points, if you end up using it in one of your own projects, hit me up in the comments!