The Artifacts Cycle is a tetralogy of Magic: The Gathering expansion sets centered on the exploits of Urza Planeswalker. It consists of the expansions Antiquities (March 1994, anvil), Urza's Saga (October 1998, pair of gears), Urza's Legacy (February 1999, hammer) and Urza's Destiny (June 1999, Erlenmeyer Flask).[1][2] The latter three sets are sometimes referred to as an "Urza block" for tournament purposes, since there have been formats and time periods in which cards from the later three sets were legal but cards from Antiquities were not. However, the books "The Brothers' War", "Planeswalker", "Timestreams", and "Bloodlines" unambiguously confirm that, from a story and thematic point of view, "Artifacts cycle" is correct and it begins with the events depicted in Antiquities.