To Buff a unit, place a Buff Counter on it if it does not have one already 1. If the unit already has a Buff Counter on it, it does not get another one. 2. Some effects may grant a Game Object permission to be Buffed multiple times. Such an effect ignores this restriction.
§ 426.1.b Core Rules PDF (officieel)
§ 426 Buff
§ 426.1 Buffing is the action of placing a Buff counter on a Unit. See rule 701. Buffs for more information.
