When Master Yi's passive gives +2 might to a solo defending unit (Stalwart Poro) that has a hidden Pakaa Cub, does the Poro get the buff before revealing the Cub, and does it keep the buff after revealing?

Ruling: The Stalwart Poro gets the +2 might from Master Yi's passive while it is the only defending unit. When you reveal the Pakaa Cub, the Poro immediately loses the +2 might because Master Yi's passive requires you to control only one defending unit.

Nuances:

• Master Yi's ability is a passive (not a trigger), so it only applies while the condition is met
• This differs from triggered abilities like Mask of Foresight, which would grant a buff that persists until end of turn even after the condition changes