In Showdown, when two of your units die and you have a Zhonya's, do you get to choose which unit dies first, or does your opponent choose?

Ruling: When multiple units die simultaneously and you control a replacement effect like Zhonya's, you get to choose which death is replaced.

Sequence:

• All units die at the same time
• The controller of the replacement effect (Zhonya's) chooses which death event to replace

Nuances:

• This applies specifically when units die to combat
• When a replacement effect would replace two events at the same moment, the controller of the replacement effect chooses which is replaced