It has been almost a month since the "replace robots" feature was introduced to World of Card Games, only to be removed when a bug was uncovered. Today this feature was reintroduced. I think the bug has been fixed... Give it a try! And please let me know if you experience any issues with this new feature. For more info about how it works, visit the "replace robots" blog post.
[Edit Feb 14 2014: another bug occurred on the same day which caused serious problems, so the replace robots feature has been removed once again. I'll be working to fix it, and it should return in the future.]