If Promising Future reveals 5 cards that all have power costs and you don't want to play any of them, can you decline to play a card, or are you forced to pay the power cost?

Ruling: Based on rules as written (RAW), you must choose one of the revealed cards to play with Promising Future since it has no "may" clause. If all revealed cards require power costs, you must pay the power cost for whichever card you choose.

Nuances:

• There is debate about whether "red text" (unofficial developer commentary) stating "you can never be forced to activate abilities" should override the written rules
• Some argue that if you cannot pay the power cost without activating abilities (and the game cannot force you to activate abilities), the play becomes illegal and the card returns to banish
• The rules currently lack clear guidance on whether players are forced to activate abilities to pay costs in situations like this
• The consensus among judges is to rule according to RAW even if it differs from developer intent, until official rules clarification is provided
• This is distinguished from the Deflect situation where you have no choice in targeting