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This "enters or attacks" trigger is insane, because provided you have at least one nonland permanent in your graveyard, Sin is always going to bring it back, and by the time you play him in these colors it's virtually impossible that you don't have stuff to get back

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Then, when at least one creature with counters on it deals damage to a player, you draw a card and proliferate, meaning that all your creatures with at least one token receive an additional token

The cards mechanics reflect that in nuanced ways

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