Explain how King's Edict resolves?

King's Edict resolves by forcing each of your opponents to choose a unit you do not control to be killed. Because the choice is made by the players during resolution rather than by the spell itself, it does not "target" units in the traditional sense.

According to the official ruling for King's Edict:

• The Sequence:
  1. The spell resolves.
  2. Starting with the next player in turn order, each opponent chooses one unit you don't control that hasn't been chosen yet for this spell.
  3. This continues until all opponents have made their choice.
  4. All chosen units are killed simultaneously.
• Key Nuances:
  • No Targeting: The caster makes no choices. The spell does not target, meaning units with protection from being chosen by enemy spells or abilities (like Rune Runner) can still be chosen by players as instructed by this spell.
  • 1v1 Format: In a standard 1v1 game, this functions as: "Your opponent chooses one of their units. Kill that unit."
  • Multiplayer Format: In games with more than two players, each opponent chooses one unit you don't control, and all of those units are killed. In 2v2, this can be particularly disadvantageous for the caster, as opponents can choose your teammate's units.