Decks built around Smokestack have been rather a fringe player in Legacy and Vintage for a while as the game has gotten more and more efficient. However, this hasn’t stopped people like me consistently trying to make it work! The deck I ran through the league was built originally by Charlie-in-the-Mox who has been jamming something like this for years. Rich Shay and I have changed it up a bit to try and make the utterly terrible Aggro Loam match-up slightly better.
I think there is plenty of scope for development of this kind of strategy, especially surrounding the mana base. One could try the Metal Worker and Grim Monolith or Cloudpost bases, and there are examples of Stax lists built with both of these. Cards like Buried Ruin are crying out for a grindy strategy to abuse them. Hour of Devastation might also bring us some new Lands to try, perhaps a Desert mana base will turn out to be an oasis?
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