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These lands are not among those unique to the starter sets based on their collector numbers (those over 500 like the rares), so they can be expected to be seen in the main set, along with some payoffs for having them
King Suleiman ($161) King Suleiman was probably quite good when it was first printed, and djinn/efreets were more common to see, but these days its just pure nostalgia (and Reserved List, obviously!)
Enchanters Bane isnt something Ive played with much recently, but the ability to make players choose whether to keep their enchantment or take damage becomes much better in this sort of deck
When paired with cards like Gray Merchant of Asphodel, Exsanguinate, and Blood Tribute, you can rip through an opponents life total in no time
It's one of the reasons why the first slate of dual lands is so expensive, and why other mana-only entries can be pricey as well