When a Power like "Powerstorm" grants target Spirit the option to repeat a Power Card of their choice "once this turn," do they have to immediately choose which Power Card will later be repeated?
No, the Spirit is granted the option to repeat a Power Card in the general sense, rather than a specific Power Card being granted the option of being repeated. This is particularly relevant if Target Spirit has multiple Slow Power Cards in play, since they can see the outcome of the Invader Phase before choosing which of those Power Cards to repeat. The chosen Power Card does not need to have even been in play when the repeat-granting Power was used – if target Spirit is granted the option to play a Power Card later in the turn, the granted repeat can be spent on that Power Card.
If the granted repeat has a restriction on which Power Cards can be chosen, such as "lowest-cost Power Card they have in play" (from "Gift of Twinned Days"), that condition is checked when repeating the chosen Power Card, not when the option to repeat is granted. Which Power Cards can be repeated this way can thus change over the course of the turn in the uncommon case that Power Cards enter or leave play. Tags: Repeat, Gift of Strength (Vital Strength of the Earth), Vital Strength of the Earth, Gift of Twinned Days, 4 more...
If you can Repeat the Power "this turn" (e.g., from "Powestorm" or "Gift of Strength"), then you may use another Power between the two uses of the repeated Power.
If the Power repeats itself (e.g., "Creepers Tear into Mortar" or "The Land Thrashes in Furious Pain") or you are granted the option to Repeat a Power "After" using it the first time (e.g., from "Relentless Punishment" or "Strength of the Waking Island"), then resolve the Power and anything else it triggers (e.g., "Vengeance of the Dead") before immediately Repeating it – you don't have a chance to use another Power first. (Discussion elsewhere) (Discussion elsewhere) Tags: Repeat, Gift of Strength (Vital Strength of the Earth), Powerstorm, Gift of Twinned Days, 20 more...
