Number 17: Leviathan Dragon

Number 17: Leviathan Dragon was released in the 2011 Yu-Gi-Oh! Trading Card Game expansion set, Generation Force. As one of the earliest Xyz Monsters introduced to the game, it marked a significant shift in mechanical complexity, representing the debut of the Xyz Summoning mechanic derived from the Yu-Gi-Oh! Zexal anime series. The card was designed to be a high-attack threat that relied on detaching materials to grow in power, serving as a flagship card for the new mechanics introduced during that era.

The Ghost Rare version of this card, GENF-EN039, is prized by collectors for its unique printing process, which uses a 3D laser-etched holographic image rather than traditional foil stamping. This variant was part of Konami's strategy to include high-rarity chase cards in base sets to bolster interest among competitive players and collectors alike. Upon its release, it was well-received for its versatility in Rank 3 Xyz decks, quickly becoming a staple in the competitive meta due to its ease of summoning and aggressive stat-boosting capabilities.