Does Imperial Decree make 1 damage count as lethal damage, allowing a unit to kill multiple defenders with less might than their combined total?

Ruling: Imperial Decree does not change how damage must be assigned during combat. You must still assign damage equal to or greater than a unit's current Might before assigning damage to another unit. The card creates a triggered ability that kills any unit when it takes damage, but this doesn't make small amounts of damage count as "lethal damage" for assignment purposes.

Sequence:

• Imperial Decree resolves and creates a lasting effect for the turn
• During combat, damage is assigned following normal rules (must assign full Might to each unit before moving to the next)
• When a unit takes any amount of damage, Imperial Decree triggers
• The trigger goes on the chain and kills the unit when it resolves

Nuances:

• The effect applies to all units for the entire turn, including units played after Imperial Decree resolves (it modifies game rules, not individual units)
• The intended use is to attack with multiple small units in separate combats/showdowns at the same battlefield
• Units that take lethal damage from combat will already be dead before the Imperial Decree trigger resolves
• The trigger can be reacted to, but cannot be stopped once on the chain