You can also activate Urza at instant speed, so it is very low opportunity cost to keep mana open in this deck
Not only that, but it enters with four loyalty off the bat, and subsequent artifacts add more to Tezzeret
You can tell the top-down design here, where someone asked: If I design a card to be a moat, what would it look like? It might not be the most powerful, especially when decks dont necessarily need to attack to win, but its still cool and combines well with cards that enable flying
Doing a quick bit of math, if the 57 main-set mythics I've gotten so far cost $300, this would mean that I'm paying roughly $5.26 per mythic, which would mean the remaining 27 main-set mythics would cost another $142
Let me know in the comments section below or in the Draftsim Discord
Emrakul, the World Anew gives us another playable Emrakul for Commander