When conquering Candlelit Sanctum and seeing Nocturne in the top cards, can you exhaust runes to create floating mana before recycling to pay for Nocturne?

Ruling: Yes, you can exhaust runes to create floating mana before recycling to pay for Nocturne. Whenever you need to pay resources, you get a chance to tap and recycle as many runes as you want to float energy, or activate any other reaction add effects.

Sequence:

• Conquer Candlelit Sanctum and look at top cards
• See Nocturne among the cards
• When paying for Nocturne, exhaust runes to float energy
• Use the floating energy to pay for recycling Nocturne

Nuances:

• Energy created this way stays in your pool until you use it or end of turn
• This applies to any reaction add effects, not just runes