Number 47: Nightmare Shark

Number 47: Nightmare Shark was released as a promotional card bundled with the fourth volume of the Yu-Gi-Oh! ZEXAL manga series. Its introduction served to support the expansion of the Xyz Monster mechanic, which was the central gimmick of the ZEXAL era, allowing players to overlay monsters of the same level to summon powerful allies from the Extra Deck.

The card features artwork depicting a spectral, shark-like entity, consistent with the design aesthetic of the 'Number' series, which are often characterized by their ethereal or mechanical appearances. Within the game's mechanics, it was designed to provide utility by allowing other monsters to attack directly, a strategy that made it a situational but effective tool in mid-game maneuvers. As an Ultra Rare promotional insert, it has remained a notable inclusion for collectors focusing on the ZEXAL-era manga promos.