When my opponent has Zhonya's Hourglass and 2 of their units die in combat, how do we decide which one is brought back?

Ruling: The controller of Zhonya's Hourglass chooses which unit to bring back when multiple units die.

Nuances:

• Zhonya's Hourglass must trigger when a unit dies; the controller cannot choose to not activate it to save it for a later unit
• The controller can choose the order if multiple units die simultaneously