Tighten Our Belts
The Nîn-in-Eilph #86 (x3)

Refresh Action: Choose a player. Each hero that player controls that did not spend any resources this round gains 1 resource. Only 1 copy of Tighten Our Belts can be played by the players each round.

There was nothing now to be done but to tighten the belts round their empty stomachs, and hoist their empty sacks and packs... –The Hobbit