The amount of intricate play with Urza's Saga is definitely very interesting. There's a fair number of interesting things you can do with this card, and the heuristics of playing it are relatively intriguing. For example, using Saga as a simple mana producing land and a tutor is great by itself sometimes, outside of the construct making ability.
That being said, there's some unique stuff you can do in conjunction with other cards, such as Crop Rotation for example. If you cast a Crop Rotation in your draw step or on your opponent's end step for an Urza's Saga you will get the first Lore counter on the land and then once you're in your main phase you'll immediately get the second Lore counter and its resulting trigger.
One of the more unique things you can do with this card though is its interaction with Thespian's Stage. Because the Saga half grants abilities to the land, by making Stage a copy of Saga you end up with an Urza's Saga with zero Lore counters on it, which the Stage copy will accrue as normal. However, if you copy another land before the third Lore trigger resolves (in response to it), the Land will no longer be a Saga enchantment subtype and thus won't be subject to the rules of Sagas when the trigger resolves, and will keep all of the abilities that the Saga half of the card granted to it. This functionally allows you to keep a Stage on board that can continue making Constructs without having to be subject to sacrificing itself, and you still get to tutor for an artifact. Bonus points are granted here if you make Thespian's Stage copy a Basic land because then you can even beat Blood Moon with this ability.
Speaking of Blood Moon, the rules in regards to how Urza's Saga is treated under such effects (Moon, Blood Sun, Alpine Moon) are highly interesting because of the Saga half of the land. Saga rules are very picky, and once the Saga loses any Chapter abilities, the rules state that the maximum Chapter number is zero, and then further states that the Saga has to be sacrificed because the number of Lore counters on it either equals or exceeds the maximum Chapter number.
There are also a lot of ways to counterplay against Saga outside of Moon effects. For example, another card we will be discussing in Dress Down is great against the tokens, but also destructive cards like Force of Vigor and Pernicious Deed clean up the land as well since it is an Enchantment subtype.
https://www.mtggoldfish.com/articles/this-week-in-legacy-tips-and-tricks-for-legacy-in-2022
