Can you exhaust runes for energy, then recycle one of those runes to play a seal, then reveal a spell that was paid for by the exhausted runes to pay for it with the seal?

Ruling: Yes, this is legal. You can float energy and power in Riftbound by exhausting runes to add energy to your pool without immediately spending it, then recycle those same runes for other purposes while the energy remains available.

Sequence:

• Exhaust 4 runes to add 4 energy to your pool
• Recycle 1 of those exhausted runes to play a seal
• Reveal the 4-cost spell with recycle cost of 1
• Exhaust the seal to pay for the spell using the floating energy

Nuances:

• Your energy pool only empties at each player's draw phase and at the end of each player's turn
• You can exhaust runes to generate energy, then use that floating energy later in the same phase for spells or abilities