Does Mask of Foresight's +1 might bonus remain on a unit if another unit joins the showdown after Mask has triggered?

Ruling: Mask of Foresight triggers and snapshots when the unit initially enters combat alone. The +1 might bonus remains even if another unit joins the showdown later.

Sequence:

• Unit attacks alone into a battlefield, triggering Mask of Foresight on the Initial Chain
• Mask resolves, granting +1 might to the unit
• The bonus is locked in and does not change
• During the open showdown (when you have Focus), you can play cards like Zenith Blade to bring in additional units
• The original unit keeps the +1 might from Mask regardless of other units joining

Nuances:

• Triggers that change might (Mask, Smoke Screen, Stupify, Thousand-Tailed Watcher) all snapshot and don't continue to check conditions after resolving
• Attack triggers like Mask can trigger anytime a unit moves into combat for the first time, which is useful for Zenith Blade strategies