Can you float energy to pay for recycle costs when using Power Nexus's effect?

Ruling: Yes, you can float energy to pay recycle costs for Power Nexus. You can either float it in response to the trigger or while the triggered ability is resolving and you are paying costs.

Sequence:

• Float energy either in response to the Power Nexus trigger, or while the triggered ability is resolving
• If floated in response, you can potentially use it for a reaction speed effect
• Energy will be removed from your rune pool at the end of the draw phase

Nuances:

• Floating energy will mostly not have a huge impact unless you can spend it before the end of your draw phase
• You would need a triggered ability to go on the chain between beginning phase and the end of draw phase to use the floated energy
• The most common way to use floated energy is with a reaction speed effect that costs energy (like Consult the Past) activated in response to the Power Nexus hold trigger
• Power Nexus starts a chain every time you hold it, not just when you pay for it (similar to Jinx legend)