Yes, you can create a copy of a melded creature (or a melded planeswalker, in the case of Urza, Planeswalker) just like you can anything else
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I cant help but hear the music every time I see it, and its a just one example and testament to the Constructive power that Basic Lands can have
Chart shows the price of Schoolboy [Reverse Holo] #238 at the end of each month going back as long as we have tracked the item.
Granted, it sucks that you can't attack unless you tribute a monster but given it summons an Egg Token every time you destroy a monster, you basically get a free monster to sacrifice every other turn (provided the token doesn't get destroyed but hey, a DNA Surgery and Insect Barrier combo will stop that!)
Each keyword can be chosen only once on any given day