User blog comment:ShadowEyepatch/JOKER/@comment-25077685-20160410063649/@comment-27589621-20160411001748

Yeah, resting a unit to lock an opponent's rearguard is even more OP than this guy, but I do see the potential for the Joker archetype. However, the wording would probably be along the lines of "Choose one of your opponent's rearguards, and this unit gets the ability of that unit until end of turn. Lock the chosen unit." Well, not quite like that, but somewhere along that idea. But that'd have to be pretty costly considering its more powerful than simply locking a unit. If there was a way to exclude the clan specific abilities that'd be good too. And you could have cards like "When one of your opponent's rearguards are chosen to be locked, choose that unit, and this unit gets all of its abilities until end of turn."

Not sure if that's quite the direction you were going to Shadow, but its a thought.