Does Ahri need to recycle a rune to use her 'When I defend give a unit -2' ability on a unit with deflect, and can she use the ability if she has no runes to recycle?

Ruling: Yes, Ahri needs to recycle a rune to target a unit with deflect using her 'When I defend give a unit -2' ability. If you cannot recycle a rune (because you have recycled all of them), you cannot use Ahri's ability on that unit with deflect.

Nuances:

• Deflect requires you to pay the power cost to target the unit
• The inability to pay the cost (no runes to recycle) prevents the ability from being used on that target