How often do Auras, Equipment, or Fortifications receive new timestamps?

Auras, Equipment, and Fortifications receive new timestamps specifically when they attach to a new object or player. This is significant because timestamps are used in Magic: The Gathering to determine the order of effects and interactions when multiple objects or permanents are involved.

When an Aura attaches to a new creature, for example, it creates a new timestamp that indicates when the Aura started to affect that new target. This ensures that any interactions involving the Aura conform to the game's rules regarding the order in which permanents and their associated effects influence one another.

In contrast, the other scenarios mentioned do not apply. An Aura does not receive a timestamp simply for entering the battlefield or when it is activated. While activation can change how an Equipment functions or might lead to it attaching to a creature, it does not change the timestamp. Similarly, receiving a new timestamp when destroyed is not applicable since destruction does not involve attachment to a new object; it simply results in the permanent's removal from the battlefield. Hence, the concept of timestamping is central to understanding how these types of cards interact within the game.