Or they can pick out cards they need to finish their decks
If this spell was kicked, instead choose target creature
The deck features an ENORMOUS number of land destruction effects including spells that can wipe out all lands (Armageddon, Boom // Bust, Wildfire, Catastrophe, Obliterate, Decree of Annihilation, and many more) as well as a number of targeted land removal spells
Some of that is just good fortune in how all these effects are worded, but Id say its more that discarding is an inherently effective way to interface with Magic s core mechanics
The selling price depends on how well the card has been taken care of
In this context, Urza is basically just an Inspiring Statuary that can give you blue mana for any purpose and float extra mana, which makes it considerably easier to go off, though an extra mana to get started and not itself being an artifact are both substantial drawbacks