Ninjutsu
Ninjutsu is a keyword ability that was introduced in Betrayers of Kamigawa. It represents the sneakiness of the Ninjas by allowing a creature that is attacking and unblocked to be exchanged with a Ninja in the controlling player's hand, such that the Ninja is attacking and unblocked instead of the original creature, which is returned to the controller's hand.
The keyword has only appeared in Betrayers of Kamigawa, and exclusively on black or blue Ninja cards.
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