The words "you" and "your" on an object refer to the object's controller,
its would-be controller (if a player is attempting to play, cast, or activate it),
or its owner (if it has no controller).
For a static ability, this is the current controller of the object it's on.
For an activated ability, this is the player who activated the ability.
For a triggered ability, this is the controller of the object when the ability triggered, unless it's a delayed triggered ability. To determine the controller of a delayed triggered ability, see rules 603.7d-f.