What is a zone-change trigger?

A zone-change trigger refers to a triggered ability that activates when an object, such as a card or a permanent, transitions from one zone to another within the game. This could involve various types of movement, such as a creature moving from the battlefield to the graveyard, a card being drawn from the library, or a spell being cast.

The primary characteristic of a zone-change trigger is its reliance on movement between defined areas in the game, which is a fundamental aspect of the game’s structure and mechanics. For instance, a card like "Gleaming Overseer" would have an ability that triggers when a Zombie enters the battlefield, creating a direct example of a zone-change trigger since the Zombie is moving from the player's hand (or elsewhere) into the battlefield zone.

Other choices refer to different functions: for example, casting spells, while important, does not pertain to movement between zones, and abilities that activate on attacking are not necessarily related to zone changes either. Therefore, the first choice accurately encapsulates the essence of a zone-change trigger as defined by the rules of Magic: The Gathering.