But given that Thousand Moons Smithy comes down and makes a Karn-struct thats reasonably large right away in an affinity deck and then also likely flips the next turn, this seems like a nice artifacts top end, especially because Barracks of the Thousand is an artifact land
So, Urborg, Tomb of Yawgmoth is a Legendary Land card that turns all lands into Swamps in addition to their other Land types
When you add in time for rolling and wacky effects, Planechase Commander games can take a while, too, so you should probably expect to settle in for a little longer than normal, though some of the new planes really encourage attacking and moving the game along, so maybe less than you might think if you're used to Planechase Commander already
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Mono-green is simpler, while Golgari gives you more interaction