waywreth has it right: this is considered outside notes.
From the Universal Tournament Rules:
28. Taking Notes
Players are allowed to take brief written notes regarding the current match and may refer to those notes while this match is in progress. Players are expected to take their notes in a timely fashion. Players who take too much time will be subject to the appropriate provisions of the DCI Penalty Guidelines.
During the draft portion of a tournament, players and spectators may not take any notes. Players may not refer to outside notes during the match. This includes notes from previous matches of that day.
Cards used in a tournament may not have writing on their faces other than signatures or artistic modifications. Modifications may not obscure the artwork so as to make the card unrecognizable. If modifications to a card are deemed by the Head Judge to constitute outside notes or unsporting conduct, the player using such cards will be subject to the appropriate provisions of the DCI Penalty Guidelines.
From the Penalty Guidelines:
138. Tournament Error — Outside Assistance
Definition
A player, spectator, or other tournament participant does any of the following:
Seeks advice from others once he or she has sat for his or her match.
Gives advice to players who have sat for their match.
Any time after arriving at the play table, references notes made before the official beginning of the current match, including Oracle text that has not been provided by a judge.
These criteria also apply to any deck construction portions of a limited tournament. Additionally, no notes of any kind may be made during a draft.
Notes made during a match may be referenced during that match or between matches. Notes made outside the current match may not be referenced once a player has sat for his or her match until after his or her match is completed.
Examples
A.During a Magic tournament match, a player references sideboarding notes that were created before the tournament.
B.A player in a Dreamblade tournament references notes about his opponent’s warband after arriving at the table for his match.
C.A spectator at a Magic tournament points out the correct play to the player, who had not solicited the information.
Philosophy
Tournaments test the skill of a player, not their ability to follow external advice or directions. Any strategy advice, play advice, or construction advice from an external source is considered assistance. Notes made during a match are legal to reference during the match or between future matches.
Penalty
Regular
Competitive
Professional
Warning
Match Loss
Match Loss
Spectators who commit this infraction may be asked to leave the venue if they are not enrolled in the tournament.
