Fetchlands have other uses, too
The Enchanted cards in Azurite Sea have a stylised, sepia toned look, with line drawings that ape the aesthetic of old maps, which is definitely in keeping with the nautical, piratical theme of the set, and there are 18 cards in all: What Characters Are Making Their Debut In Azurite Sea
Iconic Cards (Rainbow Octagon) The newest and rarest tier in the game, introduced in the Fabled set
Other people warped their mana bases and did massive damage to their decks to try and make good use of it, and many good players took far longer than they otherwise would have to recognize Zuran Orb due to the time they'd spent pointing and laughing at Dark Hearts
Card not found was still an uncommon, but there was no frills here
BOT cards can be opened in Set and Collector Boosters in both foil and non-foil