There was two changes made to the EDH banned list on December 4th:
Painter’s Servant – BANNED
Grindstone – UNBANNED
From the official EDH Website:
Painter’s Servant has been the fuel for unpleasant combos, most notably with Grindstone and Iona, Shield of Emeria. The latter two cards occupy some interesting design/deckbuilding space, so we’d like to see them in the format. Swapping Grindstone/Painter’s Servant seemed like a natural fit to bring back a decent card and get rid of the true offender.
Truthfully, this was only a matter of time. Painter’s Servant is a broken card when it’s mixed with a few certain cards (Grindstone, Iona, Chaotic Backlash, Jaya), and there are still plenty of ways to effect the color of cards that are on the battlefield. That’s the reason Painter’s Servant was so good, it hit everything else that wasn’t in play. I had dabbled in a Iona/Servant deck and had seen people run it in combination with Tooth and Nail, which ended multiplayer games right there.
Grindstone can come back to help hose mono-color decks, though less effectively.
These bannings take effect December 20th. Changes to the Banned List have been made.