If a unit providing a static stat increase (like Lee Sin Centered) dies first in a showdown, do other units lose that stat increase immediately or keep it until the showdown ends?

Ruling: Units keep the stat increase during the combat damage step even if the unit providing the buff dies first, because all combat damage is dealt simultaneously.

Sequence:

• Sum the might of all your units including the stat increase from the buffing unit
• Assign lethal damage on a per unit basis
• Opponent does the same
• All damage happens at the same time

Nuances:

• Although damage must be assigned on a per unit basis first, the simultaneous resolution means buffs remain active throughout the entire combat damage step