One of the more interesting of the cards that let you run any number of copies of it in a deck, Persistent Petitioners is a mill-based version, with the hope that you can generate enough copies of them to mill your opponents out before anything else happens
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Board wipes like Austere Command, Cleansing Nova, Damnation, Toxic Deluge, Cyclonic Rift, Rivers Rebuke, Blasphemous Act, Vandalblast, and All is Dust are almost always worth having on hand in some capacity
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Plus it will remove your opponents ramp like their Sol Rings and other cheap manarocks boosting you even further ahead
Use a card box or binder specifically designed for sleeved cards to minimize movement and potential damage