Can I tap a rune to float energy, play a seal to recycle that exhausted rune, and then use the floated energy to cast another card?

Ruling: Yes, you can tap a rune without spending the energy, let it float, play a seal to recycle the exhausted rune, and then use the floated energy to cast another card.

Sequence:

• Tap a rune to generate energy without spending it (energy floats)
• Play a seal
• Use the seal to recycle the exhausted rune
• Use the floated energy to cast another card (e.g., Sabotage)

Nuances:

• Energy and power stay in your rune pool until the end of the draw phase or the end of turn
• You can recycle an exhausted rune for power