Tribute 1 "Ninja" monster; Special Summon any number of "Ninja" monsters from your Deck, in face-up Attack Position or face-down Defense Position, with combined Levels less than or equal to the Level of the Tributed monster. When this card leaves the field: Destroy those monsters.
Yay, this is good. Tribute a level 4 ninja and special summon the level 1 ninjas from deck as tribute fodder and to use their effects to destroy your opponent's backrow. It may be an inconsistent deck but it will be fun.