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For Gruul mana-fixing, I recommend prioritizing dual lands that count as both Forests and Mountains: Cinder Glade, Stomping Ground, Sheltered Thicket, and Taiga (if you're willing to spend lots of money) add layers of extra synergy to the deck because they can be fetched by lands (Wooded Foothills) and spells (Wood Elves) while also empowering cards that care about land types like Valakut, the Molten Pinnacle and Howl of the Night Pack
I could see it in a couple of sideboards for sure
First strike is an evergreen Magic: The Gathering ability
I guess a big burning bundle of sticks is probably pretty difficult to stop
While they sometimes enter the battlefield tapped, man-lands are another way to out-grind your opponents removal or chip in enough damage for lethal, even through a potential board wipe