How does Kai'Sa's ability work - does she commit to create energy or power, and how does that power function?

Ruling: Kai'Sa commits to create 1 power (not energy) that can only be used to pay power costs of spells.

Sequence:

• Commit Kai'Sa to activate her ability
• Add 1 power to your rune pool (without recycling a rune)
• Use that power only to pay for spell costs

Nuances:

• Kai'Sa functions like an extra seal, but specifically for spells only
• Unlike normal power generation, you don't need to recycle a rune to get this power
• The power goes into your rune pool (not a physical zone on the board)