Dragon-Spell
The Hobbit: On the Doorstep #51 (x2/x0)
Treachery

When Revealed: Attach to the hero with the most resources without Dragon-Spell attached. (Counts as a Condition attachment with the text: 'Attached hero gets -1 for each resource in its resource pool.Forced: When attached hero spends resources, attached hero takes X damage. X is equal to the number of resources spent.')