Does Mask of Foresight trigger each time the unit attacks or defends in a chain, and can it stack multiple times in one turn?

Ruling: Mask of Foresight triggers when the unit attacks or defends in a chain (not while), and it can trigger multiple times if the unit is involved in multiple showdowns in a turn.

Nuances:

• The buff persists even if the unit later gains allies in combat
• Triggering multiple times requires either having ways to attack multiple times (relatively uncommon) or the opponent attacking multiple times (which would typically be a misplay)