If a unit starts a battlefield with 2 units and one gets sent home, does the remaining unit get buffed by Mask of Foresight? Does that buff persist if another unit joins later?

Ruling: Mask of Foresight triggers when a unit gains the attacker/defender designation for the first time in a combat while being the only friendly unit at its battlefield. If a unit starts combat with an ally and that ally leaves, the remaining unit does not get the buff. However, if a unit starts combat alone and gets the buff, that buff persists even if another friendly unit arrives at the battlefield later.

Sequence:

• Mask of Foresight checks at the moment a unit first gains attacker/defender designation
• The unit must be alone at that specific moment to trigger the buff
• Once the buff is granted, it persists for the rest of combat regardless of other units arriving

Nuances:

• A unit that starts combat with allies present will never trigger Mask of Foresight, even if those allies leave during the combat
• The buff is granted based on the battlefield state at the moment of designation, not at any later point in combat