U.3.1- A teammate is a player who shares a victory condition with you. In other words, you both work together to win and win as a team. [QAS 1998/09/09] Partnership and Emperor formats have teammates. Grand Melee and normal two-player games do not.
U.3.2- When judging if a person performed a subjective task correctly, use your best judgment. An honest attempt which falls a little short should not be penalized. [QAS 1998/09/09] Subjective tasks include rhyming, doing an action for Bureaucracy, complimenting an opponent, etc.
U.3.3- Any random source with the same odds can replace a coin toss or die roll. [QAS 1998/09/09] But the replacement still counts as its original type. For example, rolling a die to simulate a coin counts as a coin flip and not a die roll. [D'Angelo 1998/09/09]
U.3.4- You cannot target a player in a different game. [QAS 1998/09/09]
U.3.5- If you rip up or mark a card in a tournament because you are required to do so by a spell or ability, your deck is not made illegal. Instead, before the next game, you must bring your deck back up to 60 cards by borrowing from your sideboard (if your sideboard has any more cards and if your deck fell below 60). [QAS 1998/09/09]
U.3.6- If you are required to remove cards from your deck or sideboard for the duration of a match a tournament, your deck is not made illegal. Instead, before the next game, you must bring your deck back up to 60 cards by borrowing from your sideboard (if your sideboard has any more cards and if your deck fell below 60). [QAS 1998/09/09]
U.3.Ruling.1- You cannot use a coin with two heads (or tails) or a die which does not have 6 different values, as per Rule U.3.3. [D'Angelo 1998/10/23]