Fleshbag Marauder lets you sacrifice one creature while also acting as decent removal for opponents with only one creature in play (which is usually their commander!)
Its so good, in fact, that its one of the small number of precons including the MH3 ones, and some Final Fantasy ones, that have the honor of being not really a Bracket 2 deck, and closer to Bracket 3 out of the box. Other lands decks like Lord Windgrace focus on using fogs and build slow value, or going for combo like The Gitrog Monster
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Panharmonicon will double all triggers from creatures entering
It can help enable landfall by making creatures like Wood Elves and Topiary Stomper get extra lands into play