This paired with Steward of Gondor is amazing. If you have a deck with Leadership Denethor and Any Éowyn with the two attachments I mentioned above, (one being SoH) you can give Éowyn resources to still buy stuff, and she can commit 7 each round.
Song of Hope
Attachment. Cost: 0.
Attach to a hero. Limit 1 per hero.
Action: Spend 1 resource from attached hero’s pool to give attached hero +1 until the end of the phase. (Limit 3 times per phase.)
The Black Serpent #82. Leadership.
Why not just use Celebrian's Stone rather than using Steward's resources on temporary willpower? — NERD 104