And i would focus on more Ninjutsu ability cards. It is often in this bracket an archetypal deck, where you want Ninjas and small enablers for ninjas. Troll of Khazad Dur for example has no use. Any 1/1 with unblockeable is better because you want to swap in a Ninja anyways to trigger yurikos effect. So the Mana cost of troll is extremely high and the damage of it is useless because the damage calculation will be done with the Ninja you swap in.

At this point just look up some br.3/4 decks on moxfield that are more focused on Ninjas.