If Viktor (leader) and another unit both die simultaneously from losing a showdown, does Viktor's ability trigger to play a token?

Ruling: No, Viktor's ability will not trigger. Even though the units die simultaneously, in Riftbound game objects do not see simultaneous events if they die as the events happen.

Nuances:

• Combat damage in the combat damage step is dealt simultaneously
• The restriction on seeing simultaneous events applies to game objects generally, not just units
• Delayed triggers are the only triggers that get around this restriction