EDIT: This bot is not being supported or developed. Please use the bot linked below:
http://www.taultunleashed.com/phpbb2/about60813_VGExtreme_DiplomacyBot_.html
Here's a diplomacy bot I threw together the other day and have been using myself successfully.
It is fairly simple, but works quite effectively when you have your deck set up right. There aren't too many options at this time, but depending on user interest and whether or not wyvernx puts in a function that will return an array containing your entire deck strategy (or a set of functions), complete with all information that's visible on the cards, I'll gradually build upon this bot.
Instructions for setup can be found in the comment headers of both files that load. Feedback/suggestions welcome.