Presence on Card outside of the Board — Riftbound Rules

Section 366 — 3 rules

366.1.: Passive Abilities of cards in zones that are outside of the Board will self-describe their context. Example: The passive ability "Play me only during an opponent's turn." applies in any zone from which that card can be played.
366.2.: Passive Abilities can alter the costs of cards as they are played.
366.2.a.: These apply at all times in any zone from which the card with the ability can be played.