Does Master Yi's Legend passive (+2 might to lone units) apply outside of showdowns, and will a lone 2-might unit die to 2 damage from a spell?

Ruling: Master Yi's ability only applies when the unit is defending, which only occurs during Combat (showdowns). A lone unit with 2 might will die to 2 damage from a spell because the +2 might bonus is not active outside of Combat.

Nuances:

• "Defending" is only relevant during Combat, which happens when an enemy unit reaches a battlefield you control
• The passive bonus does not apply during non-combat situations like spell damage