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As for the 13th slot in the pack, it is a guaranteed foil card, and it can be of any rarity yes, you can even get a mythic rare foil

For example, Bracket 2 decks cannot have any Game Changers

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So, if you're planning on killing an attacking creature anyway, and you don't think your opponent has a way to counter it, then you should wait until the last moment in order to potentially draw out a (useless) trick

To put that into perspective: for $230, you could buy two full Set Booster boxes of Streets of New Capenna, for a total of 60 packs and 722 cards

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