Sure, you don't gain a life with the land drops, but you are able to play an additional land on each of your turns, which means Aesi is letting you draw an additional two cards per turn
Heres the current SCG retail value for each of them, in reverse order of release date: Amonkhet $90 Aether Revolt $90 Kaladesh $90 Eldritch Moon $95 Shadows Over Innistrad $90 Oath of the Gatewatch $90 Battle for Zendikar $100 No real surprises here
Chance to find a Traditional Foil Borderless Mythic Planeswalker in 1% of boosters
They will appear inside the Collector Booster 1% of the time
If it's not a spell we can (or want to) cast, then this ability is virtually the same as drawing a card and having it sitting in our hand
Combine that with the popularity of Underground Sea, and you get a misprint thats both expensive and highly desirable among dedicated collectors