Secret Cultist
A Shadow in the East#39 (x2/x1)
When Revealed: Attach to the highest attack ally in play. (Counts as a Condition attachment with the text: "Attached ally loses the ally card type, gains the enemy card type, and engages its owner. Treat attached ally's text box as if it were blank. If Secret Cultist is discarded, or the attached ally's owner is eliminated, discard attached ally.")