When you move a unit into an open (uncontested) battlefield, are there attacker/defender designations for card effects like Mask of Foresight?

Ruling: There are no attackers or defenders during uncontested showdowns. Moving a unit into an open battlefield makes it contested but does not create attacker/defender designations.

Nuances:

• The player who moves their unit in first is the one applying the 'contested' status to the battlefield
• If the opponent later moves a unit in (e.g., via Ride the Wind), they would become the defender
• Units with Assault and Shield do not get their might boosts during uncontested showdowns
• Effects that trigger on or reference attackers/defenders (like Mask of Foresight) do not apply until the showdown becomes contested with both players having units present