When an opponent plays Thermo, can I exhaust all my unexhausted Gold to generate power and then play Reaction speed spells with that power before Thermo resolves?

Ruling: Yes, you can exhaust all your unexhausted Gold to generate power and play Reaction speed spells with that power while retaining priority before Thermo resolves.

Sequence:

• Opponent plays Thermo
• While you have priority, exhaust your unexhausted Gold to generate power
• Use that power to play Reaction speed spells
• Your unspent power won't disappear until the next draw step or end of turn

Nuances:

• Only unexhausted (ready) Gold can be used to generate power, not exhausted Gold
• This works similarly to recycling a rune, except runes don't need to exhaust to be recycled for power