How does buff work in Riftbound, including permanence, interactions, and whether units can have multiple buffs?

Ruling: A buff gives +1 might to a unit as long as the unit has it, and units can only have one buff at a time. Buffs stay on the unit until it dies or is spent for other benefits.

Sequence:

• A unit can only receive a buff if it doesn't already have one
• The buff remains on the unit until death or spent
• The +1 might bonus applies continuously while the buff is present

Nuances:

• You can target a unit that already has a buff with a buff effect, but it won't gain another buff (matters for legal targeting and sequencing)
• Many cards allow spending buffs from units for other benefits