Ambush — Riftbound Rules

Section 822 — 9 rules

822.1.: Ambush is a Passive Ability keyword.
822.1.a.: It is normally present on Units.
822.1.b.: It is functionally short for "I may be played to a battlefield where you control Units" and “I have [Reaction] as long as I’m being played to a battlefield where you control Units.”
822.1.c.: It is a passive ability that adds options to locations that are valid for a Unit to be played to during the Make Relevant Choices step of Playing a Card See rule 349. Playing Cards for more information
822.1.d.: Ambush can also appear as a verb on a card. In such a case, the verb is taken to mean “play with the permissions of the Ambush keyword.” Example: Rengar, Trophy Hunter reads in part “I can [Ambush] to a battlefield where there are enemy units, even if you don't have units there.” This ability expands the normal permissions of the Ambush keyword to include battlefields where there are enemy units. Example: A card reads in part “Opponents can only [Ambush] at any time they could play cards with [Action].” This ability introduces a restriction to when opponents can play cards with Ambush.
822.2.: Multiple instances of Ambush are redundant.
822.3.: If there are no units at the location chosen before Finalization completes for any reason, then it is no longer a valid location by Ambush’s reasoning and cannot be played there
822.3.a.: Other effects and permissions may still enable this Unit to be able to be played to the selected location, but Ambush’s permission will not be valid
822.4.: Ambush, and whether or not a unit has Ambush, is a characteristic of the Unit and may be checked or referenced by other Game Effects.