Easterling Horse
A Shadow in the East #19 (x3)

While attached to an enemy, counts as a Mount attachment with the text: "Attached enemy gets +2 Forced: At the end of the round, return attached enemy to the staging area."

When Revealed: Attach to the lowest engagement cost Easterling enemy without an Easterling Horse and return it to the staging area. Otherwise, Easterling Horse gains surge.