mtg champions of kamigawa booster box Magic the Gathering Card Game Pack : Toys & Games so this is one Red;Yellow;Black Rarity:Ultimate Rare McDonald's Unveils New Pokémon

mtg champions of kamigawa booster box Magic the Gathering Card Game Pack : Toys & Games so this is one Red;Yellow;Black Rarity:Ultimate Rare McDonald's Unveils New Pokémon

McDonald's Unveils New Pokémon Toys Coming to Japanese Happy Meals

My best guess was that seven is one of the more common numbers for card games where you draw cards and perhaps it won out because it was what Richard Garfield thought people would assume to draw

Red;Yellow;Black

Rarity:Ultimate Rare

At the beginning of the game, each player draws 7 cards from their deck

so this is one of several places where players can get a rare or mythic rare in a single Set Booster