When a buffed unit takes damage but survives, does the buff remain after healing or is it removed?

Ruling: Buffs stay on a unit until you spend them or the unit leaves the board. Only damage is cleared during healing, not buffs.

Nuances:

• When a unit takes damage, its might is not reduced
• Spells that increase a unit's might for the turn are not buffs; buffs are a specific game object