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In addition to the one-shot use lands I mentioned earlier, you can also get some great use out of lands the sacrifice as part of their usage

It pushes games forward, encouraging people to grab those cards and that mana as soon as they can before someone else does

You don't even need all the self mill effects but not having them greatly increases the importance of having cheap cards across most of the types that put them selves in the bin somehow

Since Persistent Petitioners is a Human, and you can use them to mill yourself, the strategy is simply to throw a bunch of Persistent Petitioners into the deck alongside a bunch of copies of Slime Against Humanity, mill yourself out, and then play more Persistent Petitioners to cast those copies of Slime Against Humanity from the graveyard