When using Promising Future, if you cannot play the chosen card from the top 5 cards of your deck (either no valid target or insufficient power runes to recycle), what happens to that card?

Ruling: If you cannot play the chosen card with Promising Future, keep the card in its prior zone (the top of its owner's deck).

Nuances:

• This applies whether you cannot play it due to having no valid target or not having enough power runes to recycle
• This ruling is provisional ("not a definitive answer but for now we'd advise to rule it that way")