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You can label each divider with the set, rarity, or type of cards that are stored in that section

And if he really wants to activate Sundial of the Infinites ability, you cannot hinder that

Advanced Level: The Master Architect and the Metagame An advanced deck builder thinks not only about their own deck but also about the entire competitive environment, known as the "metagame." They build decks based on established strategic archetypes and make specific card choices to gain an edge against the most popular decks

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Conversely, creature cards with a triggered ability that removes them from the graveyard when they're put there from anywhere (or your library) will count toward that number.