This also means that the protector of a battle cannot attack it
That placement underscores the spell's power and versatility, especially when Boros Energy remains the top dog in the metagame
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When Urza, Lord High Artificer enters the battlefield, create a 0/0 colorless Construct artifact creature token with This creature gets +1/+1 for each artifact you control. You can also tap an untapped Artifact you control to add one Blue mana, and you can pay five to shuffle your library and then exile the top card of your library, then you can cast it for free until the end of the turn
If you (and players solving with you) deduce how all 13 puzzles are connected like the master sleuth Alquist Proft, you may even discover there's something more hidden underneath it all