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They are great fodder for the sacrifice effects in the set

Its just unprinted white cardstock beneath

The effect of Ninja Grandmaster Hanzo can add Ninjitsu Art of Super-Transformation from the Deck to the hand when it is Normal Summoned, so adding it to the hand this way and then setting it to your field will place a considerable constraint on the opponent

Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.) Casting a card by using its retrace ability works just like casting any other spell, with two exceptions: You're casting it from your graveyard rather than your hand, and you must discard a land card in addition to any other costs