Storyline
The story of Urza's Saga and the later sets in the block are prequels to the former Tempest, Stronghold, and Exodus sets, explaining the aftermath of the Brothers' War as seen in the Antiquities expansion.
Whereas other sets have all five colors of cards referencing the same story, Urza's Saga has each of the five colors showing a different part of the storyline. Green cards detail the conflict on Argoth, which would lead to the events of the Ice Age expansion. Black cards reveal Urza's failed attack on the plane Phyrexia. White cards document Urza's period of recuperation in Serra's Realm. Blue cards explain Urza's founding of an academy on Tolaria and his temporal experiments. Red cards show Urza's alliance with Shiv.
Shiv, Phyrexia, Tolaria, and Serra's Realm are some of the most iconic settings in Magic. Most of the story of this set is written in the book Planeswalker, though the battle of Argoth is from the end of The Brothers' War and the founding of Tolaria and alliance with Shiv are found in Time Streams.
Read more about this topic: Urza's Saga