Just yesterday, Rosewater reaffirmed Wizards' position that "black should be worse than white and green at enchantment removal"
These lands can enter untapped if you pay 2 life, providing incredible mana flexibility
This also applies to cards that passively deal damage to the opponent, such as Fiery Inscription and Coruscation Mage, allowing you to draw a ton of cards from just playing noncreature spells
Remember, these are single source cards that were only ever printed in a premium set and are unlikely to see a reprint for five years or more
Very similar to Phyrexian Arena, here you get your extra card much faster, and its more flexible too
If you have a card that is key to your plan but something you want to use late and need to protect early such as an Elixir of Immortality then Lat-Nam's is a great call