If this card is Normal Summoned or flipped face-up: You can Special Summon 1 Level 4 or lower "Ninja" monster from your hand in Attack Position or face-down Defense Position, also you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except "Ninja" monsters. You can only use this effect of "Yellow Ninja" once per turn.
The Ninjitsu Art of Transformation cards allow you to change your Ninja monsters into more powerful monsters. Super-Transformation and Mirage-Transformation are also good forms of removal and graveyard disruption respectively. Ninjitsu Art of Duplication is similar but instead Special Summons a swarm of weaker monsters.
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