No, Urza's Saga is not a permanent. It is an enchantment card, and enchantments are not permanents.
Here's why:
- Permanents are a category of Magic: The Gathering cards that remain on the battlefield for the duration of the game unless they are removed. Permanents include creatures, enchantments, artifacts, and lands.
- Enchantments are a specific type of permanent. They have special abilities that affect other permanents, players, or the game itself.
Urza's Saga is an enchantment that enters the battlefield with three loyalty counters. You can activate its abilities by removing loyalty counters. Once all loyalty counters are removed, Urza's Saga leaves the battlefield. Therefore, it is not a permanent in the sense that it does not remain on the battlefield indefinitely.