Goblins are Upon You!
The Hobbit: On the Doorstep #65 (x2/x0)
Treachery

When Revealed: Each player must search the encounter deck and discard pile for a Goblin enemy and put it into play, engaged with him. Then, shuffle the encounter deck. (This effect cannot be canceled.)

Shadow: Attacking enemy gets +1 Attack for each Goblin enemy engaged with you.