I think he is referring to a Star Wars Infinite's version of that arc from TCW, a comic book series of sort of 'What if' scenarios set in the EU. I would suggest you look on eBay, under Mortis Infinite's.
Update: Turns out, it was an editorial in Clone Wars Insider magazine, pitting Anakin and the Son against Obi-Wan and Ahsoka, then Sidious and Yoda.