If Imperial Decree kills a unit during Showdown (not through normal combat damage), does this create a trigger window where the opponent can flip a hidden Zhonya's Hourglass?

Ruling: Yes, when Imperial Decree kills a unit during Showdown, it creates a delayed trigger (not a reflexive trigger) that gives a window for the opponent to flip Zhonya's Hourglass.

Nuances:

• The kill happens through Imperial Decree's effect, not through normal combat damage
• This creates a "delayed trigger" specifically, which is distinct from a "reflexive trigger"