Rulings

• 2011-09-22
  If an opponent's extra turn is created while Stranglehold is on the battlefield, but Stranglehold leaves the battlefield before that turn would begin, that opponent takes the extra turn as normal.
• 2011-09-22
  An "extra turn" means a turn created by a spell or ability. It doesn't refer to a turn taken in a sanctioned tournament after the time limit for the round has expired.
• 2011-09-22
  Effects that tell an opponent to reveal cards from a library or look at cards from the top of a library will still work. Only effects that use the word "search" will fail.
• 2011-09-22
  Since opponents can't search libraries, they won't be able to find any cards in a library. The effect applies to all opponents and all libraries, including your library. If a spell or ability's effect has other parts that don't depend on searching for or finding cards, they will still work normally.
• 2011-09-22
  If your opponent controls a Stranglehold and an effect says "Search your library . . . Then shuffle your library," the search effect fails, but you will still have to shuffle.
• 2011-09-22
  If your opponent controls a Stranglehold and an effect says "You may search your library . . . If you do, shuffle your library," you can't choose to search, so you won't shuffle.