Black Dart
The Return of the King #58 (x2/x1)
Perfidia
Morgul.  

When Revealed: Remove a hero you control from the quest and attach Black Dart to that hero. Limit 1 per hero. (Counts as a Condition attachment with the text: "Forced: At the end of the round, deal 1 damag

Shadow: If this attack damages a hero, attach Black Dart to that hero.