Auton Soldier

You choose whether each token is attacking the player or a planeswalker they control as the token is created.

The tokens all enter the battlefield at the same time.

If the defending player is your only opponent, no tokens are put onto the battlefield.

The term "defending player" in the myriad rules (or any other ability of an attacking creature) refers to the player the creature with myriad was attacking at the time it became an attacking creature this combat, or the controller of the planeswalker or protector of the battle the creature was attacking at the time it became an attacking creature this combat.

Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any "as [this permanent] enters the battlefield" or "[this permanent] enters the battlefield with" abilities of the copied creature will also work.

Each token created by the myriad ability will be a copy of whatever Auton Soldier is copying, along with the listed exceptions. However, it doesn't copy whether Auton Soldier is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.