But if you just have some cards that are worth something and wonder if you should sell or hold, here are a few good ways to determine that
I saw Magic cards close to where I was dumping, looked for the source and took a pic, LATIN0, who did not respond to a request for comment, wrote

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Although you can sacrifice lands by using its activated ability, its best to play it with cards that naturally do that, like fetch lands, or cards like Zuran Orb that allow you to sac multiple lands
Each opponent who does can't attack you or permanents you control during their next turn