Favor of the Lady:
Attach to a hero.
Action: Spend 1 resource from attached hero's resource pool and exhaust Favor of the Lady to give attached hero +2 (will) until the end of the phase.
Increased willpower bonus with ongoing cost to allow the card to be worth including. It's closest competition I think is from Dunedain Quest and Celebrian Stone. My question is whether or not a single point of willpower is worth a card slot, regardless of cost. This is my solution.
Usually the willpower faction is more expensive than defense or attack faction. For example, allies. The allies with more wp are more expensive than allies with more defense or attack. So the attachments are the same: for example, the dunedain attachments. 1 defense costs 1 resource; 1 attack point costs 1 resource; and 1 willpower costs 2 resources.
So Favour of the Lady is correct.
I agree that it is correct and consistent. My concern, as I stated, was whether it is worth a card slot to use a card with a single point of willpower. Thus, I attempted to increase the bonus and up the cost in a particular way. If you don't agree that it's necessary, that's fine.
If you like the card as printed, I'd be very curious about how many times it gets included in decks. I, for one, have never considered it.
No disrespect intended by my answer.