What are the rules on notes in tournaments?
Example 1: Can I bring along a few hand written notes to a tournament, things like potential cards to use from my sideboard against certain decks, or a list of cards to think about naming with a Pithing Needle.
Example 2: Can I write notes while in the middle of a tournament? For example, noting down cards revealed by my opponent for whatever reason. Or, writing the name of a card named with Pithing Needle on a small scrap of paper to put on top of the card so it is clear what has been named.