How do cards with power cost symbols (⚪) work, and can seals be used to pay those costs?

Ruling: Cards with power cost symbols require both energy (exhaust runes) and power (recycle runes or use seals). Seals can only pay power costs, not energy costs.

Sequence:

• Exhaust the card with the power cost symbol
• Pay the energy cost by exhausting runes (shown by numerical value)
• Pay the power cost by recycling runes of matching color OR exhausting seals of matching color (shown by colored symbols)

Nuances:

• You can mix payment methods: exhaust a rune for energy and exhaust a seal for power
• You cannot exhaust a seal for energy and recycle a rune for power (this overpays the power cost without paying energy)
• When recycling runes for power costs, you can recycle any rune of the matching color, not just the one you exhausted for energy
• All runes of the same color are equivalent, so normally you'd recycle the exhausted one unless paying a cost requiring any color