Once you reach the phase of the game where you can afford to do multiple things per turn, you need card draw to ensure you keep having things to do (Circle of Power, Fight On!, Travel the Overworld) or at least cards which can be used multiple times (flashback spells, Ring of the Lucii, Shambling Cieth, Relentless X-ATM092)
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Gamechangers for Muldrotha Tymna The Weaver Tymna the Weaver may not look like much from the outset - sure, she draws cards when you hit people, whatever
Both decks want to radically alter their own life totals to make big spells much cheaper to cast, which includes game-ending, high-cost creatures and X spells that scale well in the late game
Then you consider how it makes Cradle immune to Wasteland and unaffected by Blood Moon