Urza's Saga
Enchantment Land — Urza's Saga
(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Urza's Saga gains "
: Add 
."
II — Urza's Saga gains "
, : Create a 0/0 colorless Construct artifact creature token with 'This creature gets +1/+1 for each artifact you control.'"
III — Search your library for an artifact card with mana cost 
or 
, put it onto the battlefield, then shuffle.
Illustrated by
Mystery Booster 2#114RareEnglishLegality
Rulings
Urza's Saga is a land, so it can only be played as a land. It cannot be cast as a spell.
Urza's Saga gains an ability from its first and second chapters. It keeps those abilities for as long as it's on the battlefield.
While resolving the chapter III ability, you can find only a card with actual mana cost or , not mana value 0 or 1. For example, you couldn't find a card with mana cost 
or one with mana cost 
.
Even though Urza's Saga is a land, it is also still a Saga, and it will be sacrificed after its last chapter ability resolves.
If Urza's Saga loses all of its chapter abilities but is still a Saga, perhaps due to a card like Blood Moon, it will immediately be sacrificed.
Although Urza's Saga has the Urza's land type, it doesn't interact with Urza's Tower, Urza's Mine, or Urza's Power Plant.