Angband Spy
The Betrayal of Mîm #175 (x4)
(35) 3 3 3 4

Forced: After an ally is played from hand, either add 1 encounter card to the staging area of a random non-unique location or raise each player's threat by 1.

...and ere long Amon R–dh was surrounded by spies, lurking unobserved in the wilderness...
–The Children of Húrin