SD would be okay if it didn't only move in Ninja in your home. That, alone, makes it an almost worthless card, as it has almost no value on the attack (which is how a Ninja deck would, presumably, win? Like, by taking provinces...?) I suppose it's kinda/sorta anti-sendhome, but there are, as noted, better movement cards that can address send-home and still offer some flexibility on the attack or the defense.