Urza does it all: You can turn your artifacts into mana and mana into cards
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While enchantments are fairly easy to destroy, especially with cards similar to the ones above, it adds an extra step to the process for your opponents barring mass land destruction like Armageddon, which can be really helpful if you have a land in play that taps for more than one mana when you use it
Getting Terror of the Peaks out early means that you can burn your opponents or their creatures consistently , often destroying creatures before they can block
If you failed to answer, then you now have two more mana the next turn
All Im saying is that all of this stuff goes away or is strongly diluted once Wizards of the Coast actually reprints the Power 9 and brand new players are opening Mox Jet and shrugging because the card was reprinted in three different Masters sets over a five year period