Even very controlling 18-land decks can just be 18 lands plus several cards that draw or fetch lands for you (Cultivate, Field Trip, Pop Quiz with access to Environmental Sciences, etc.) and skip the 19th land
Its neither particularly powerful nor exciting as a mono-white token commander, but I can see why youd run it
Courtesy of Wizards of the Coast (WotC) and Luis Scott-Vargas, check out this powerful new mill spell from Zendikar Rising Maddening Cacophy
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Other decks just play Ad Nauseam as-is, relying on the lower mana cost of cards in their deck