702. Buffs are objects placed on Units.

702.1. Buffs can be tracked with a buff reminder card from a Riftbound booster pack or with any spare object in your surroundings.

702.2. Buffs can be added or spent.

702.2.a. To Buff a Unit , a player chooses a Unit and then places a buff on it. That Unit is Buffed for as long as the buff remains on it.
702.2.b. Spending a Buff removes a single Buff counter from a Unit .
702.2.b.1. A buff cannot be spent from a Unit that does not have a buff.
702.2.b.2. A player can only spend buffs on units they control.

702.3. There can only be one Buff on a Unit at a time.

702.3.a. If a Buff is added, or instructed to be added, on a Unit that already has a Buff , it is not placed instead.