Tin Goldfish

Tin Goldfish was originally introduced in the Yu-Gi-Oh! Trading Card Game within the Hidden Arsenal 7: Knight of Stars booster set, released in North America in 2013. The set was designed to consolidate various thematic archetypes from the Japanese OCG structure decks and booster packs, specifically focusing on the Xyz Summoning mechanic introduced in the ZEXAL era. The card itself serves as a staple support monster for Level 4-based decks, reflecting the game's shift toward faster board presence and Rank 4 Xyz plays.

The card’s design features a whimsical, robotic goldfish illustration consistent with the aesthetic of the Gadget and Gear-themed cards prevalent in that era of competitive play. Developed by Konami’s design team, the card was intended to provide reliable consistency for decks needing to swarm the field, allowing players to Special Summon another Level 4 monster from their hand upon its normal summon. Its utility cemented its status as a highly sought-after common-turned-super-rare staple that has persisted in various casual and tournament-viable strategies for years.