Leyline Surge is where the fun truly starts
Urza, Lord High Artificer can create a huge artifact token which is well worth the cost alone
Sure you can get back something juicy, but Naya decks are usually very aggressive, and is this an on attack trigger, the thing you're returning won't get to attack, and it's most likely to be a creature
Surely facing a guy who has a turn one jeweled lotus will be a massive pain in the
The real reason is much more simple
New world order In one of his articles, Mark Rosewater introduced us to the New World Order in their design process: They would make sure that the common cards as they are the cards that new players will have the most contact with will never be overly complex: They should be easy to understand and easy to play with, so as these players become more interested and start buying more packs, they will gradually start having contact with rarer, and more complex cards, making the learning curve less steep