Does Spoils of War's cost reduction apply only for the first enemy unit killed this turn, or does it scale with the number of enemy units killed?

Ruling: Spoils of War costs 2 less regardless of how many enemy units died this turn. The cost reduction is triggered if at least one enemy unit died, but does not increase with additional kills.

Nuances:

• The card does not care about the number of enemy units killed
• The reduction is a flat 2 cost reduction, not scaling