Mechanics
Urza's Legacy expanded on some of Urza's Saga's mechanics.
Numerous cards with Echo had additional effects when they came into play, making it often useful to cast the cards without having to pay the echo cost on the next turn. Also, three non-creature artifacts were printed with Echo.
More "Sleeping" enchantments were introduced, including four that turned into creatures, and one of each color that produced various powerful effects when triggered.
Read more about this topic: Urza's Legacy
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