Book of Moon

Book of Moon was originally introduced to the Yu-Gi-Oh! Trading Card Game in 2004, drawing its inspiration from the classic trope of shifting the phase of the moon to alter reality. Mechanically, it serves as a versatile utility card, allowing players to flip any face-up monster on the field into face-down defense position. This ability to disrupt enemy strategies or protect one's own monsters from targeted effects made it an instant staple in competitive play, often serving as a hallmark of high-level deck building.

The YSYR-EN030 variant was released as part of the Starter Deck: Yugi Reloaded in 2013, a product designed to provide newer players with a collection of iconic cards associated with the protagonist Yugi Muto. While the illustration maintains the recognizable mystical aesthetic of the original release, this common print reflects the deck's purpose as an accessible entry point. It has been widely received as a reliable, essential tool for both casual play and historical utility, remaining largely unchanged in its function and visual identity over the decades.