When paying a Power cost for Nocturne (who banishes himself and becomes a pending item), can you tap a rune you're about to recycle to float energy before recycling it?

Ruling: Yes, you can tap the rune to float energy before recycling it to pay for Nocturne's Power cost. Any time you have to pay resources (including Power), you can use Add abilities to generate any type of resource, even if that specific resource isn't required.

Nuances:

• Add abilities can be used during the resolution of other abilities, even when paying costs
• The rule allows using Add abilities whenever "resources" (plural) need to be paid, meaning any resource payment triggers the ability to use Add abilities
• This works even though you cannot normally react to permanents being played, because Add abilities have special timing rules