Can you choose a different friendly unit when playing Marching Orders repeatedly?

Yes, when you pay the Repeat cost for Marching Orders, you can choose a different friendly unit (and a different enemy unit) for the second execution of the effect.

According to Rule 746.2.a (referenced in related rulings for the Repeat keyword): "Choices made for the additional execution do not have to be the same as the choices made for the initial execution."

How it works:

1. First Execution: You choose a friendly unit and an enemy unit. They deal damage to each other.
2. Second Execution (Repeat): You may choose the same units again, or you may choose an entirely different friendly unit and/or a different enemy unit.

Key Details:

• Targeting: Because the repeated instance is a separate execution of the effect, you are making a new set of choices.
• Timing: Both instances of damage happen during the resolution of the same spell. Cleanup (checking if units die from the damage) only occurs after the entire spell—including the repeat—has finished resolving. This means you can even choose a unit that has already taken lethal damage during the first half of the spell to fight again in the second half, as it hasn't been moved to the trash yet.