'Wicked Master!'
The Mountain of Fire #54 (x1/x0)
Perfidia
Gollum.  

When Revealed: Gollum makes an immediate attack against the first player. If Gollum is not in play, search the encounter deck and discard pile for Gollum and put him into play engaged with the first player.

Shadow: If attacking enemy is Gollum he makes an additional attack after this one.