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While other cards can do this, it's the fact Arcum's Astrolabe only costs one mana from any snow land to cost that makes it so powerful it had to be banned across multiple formats.
It isn't just that Duskmourn: House of Horror is a cool new aesthetic for MTG that has players excited, however
These cards are hard stax pieces, like Armageddon (lands), Jin-Gitaxias, Core Augur (hands), Hall of Gemstone (two or more mana colors), Iona, Shield of Emeria (spells of a specific color) Stasis (untap step) and Blood Moon (color fixing from nonbasics) all jump the fence and land squarely in the realm of shutting off decks either entirely or in part, keeping people from playing the game almost at all on their own once online depending on the meta
Cards from Unfinity that dont have the acorn symbol were originally designed to be legal in Eternal formats, but due to complications with tournament play and a general distaste for the mechanic from the player base, WotC wiped all cards that produce stickers from tournament play
Which of the four Final Fantasy Commander decks are you hoping to pick up
