Does Wilderness Reclamation untap lands during each opponent's end step as well?

Wilderness Reclamation reads: 'At the beginning of your end step, untap all lands you control.' The phrase 'your end step' is the critical limitation here. Under CR 500.1 and CR 313.1, each player has their own end step that occurs during their own turn. The triggered ability only triggers at the beginning of the end step belonging to Wilderness Reclamation's controller.

Because the ability specifies 'your end step,' it will not trigger during any opponent's end step. This is a common point of confusion, but the possessive 'your' ties the trigger to only the controller's own turn (CR 702.93 covers similar possessive phrasing, and CR 603.3 governs when triggered abilities trigger — only when their specific conditions are met).

The practical implication: you get one window per full round of turns to untap your lands via this card — during your own end step. You cannot, for example, tap lands for mana during an opponent's turn and then untap them via Wilderness Reclamation at that opponent's end step.

Concrete example: It is your opponent's turn and they enter their end step. You tap five lands to cast an instant. Wilderness Reclamation does NOT trigger. Those lands stay tapped until your next untap step. However, on your own turn, at your end step, Wilderness Reclamation does trigger and untaps all lands you control.