Assault of the Saiyans was a Dragon Ball Super trading card set released in 2019, arriving as the franchise's card game continued to build on the momentum of the anime's revival. Sets from this period are remembered by many collectors as an accessible entry point into the Dragon Ball card game, pairing bold character art with the rarity tiers that give the hobby its chase. Super Rare cards in particular have become a focal point for fans who enjoy tracking how the set's characters and transformations were represented across its checklist. This Kaio-Ken Son Goku, Defender of Earth captures Goku in the blazing red aura of the Kaio-Ken technique, a power-up that defines many of his most memorable battles. The card's pairing of the transformation with the "Defender of Earth" title speaks to the heroic role Goku embodies across the series, making it a favorite among fans of the character. Collectors seek it as a striking representation of one of the franchise's most iconic fighters in action.