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The set they are from will be random

If the search is simply for a number of cards without stating a quality, you must have them find that many cards (or as many as possible, if their library doesn't contain that many cards)

It is all about the potential to do those big turns where you do multiple powerful things

A useful Rule 0 explanation can be as simple as: "My deck is an upgraded precon, has no fast mana, and can win with a three-card combo after turn seven." This would tell the table far more than simply saying, "It's about a seven out of 10." Rule 0 can also be used to modify parts of the format

Baseball cards are small treasures