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727.3. Keywords can be referenced or specified by other Game Effects.
727.3.a. Other effects may grant Keywords.
727.3.a.1. The definition and rules of the specific Keyword will determine the behavior if a Keyword is granted while it is already present.
727.3.a.2. The effect that granted the Keyword will specify the duration for which it is granted.
727.3.a.3. If an effect that grants a Keyword does not specify a duration, the duration is as long as that Game Object remains on the Board or in its current Non-Board Zone.
727.3.b. Other effects may remove Keywords.
727.3.b.1. The effect that removed the Keyword will specify the duration it is removed.
727.3.b.2. If an effect that removes a Keyword does not specify a duration, the duration is as long as that Game Object remains on the Board or in its current Non-Board Zone.