While Black Lotuses arent unique (although theyre among the rarest, most expensive cards in MTG), theyre incredibly powerful cards with a lot of history behind them
Sheoldred is more exciting as top end goes, Grave Titan packs a lot more punch for the mana and things like Shriekmaw and Kalitas are far more preferable in any sort of midrange affair simply because they are relevant in the game that much sooner
These five-digit sales for Cosmic Soul Stones, at this point in time, seem somewhat reckless on the single card buyers' end (unless the buyers actually are the aforementioned "skilled counterfeiters"
Sheoldred, the Apocalypse more or less killed the ol dies to removal argument, showing that if a creature is strong enough it can compete in 2023 even without an ETB trigger, and Elesh Norn does even more right away than Sheoldred thanks to its ability to Torpor Orb your opponent, which in turn helps protect Elesh Norn itself
Whether these cards should be reprinted or if new ones should be introduced is an interesting question Wizards of the Coast regularly considers when designing new sets
