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12 Adventures in the Forgotten Realms (AFR) Magic: The Gathering Collector Boosters Shortcut to the coolest cards in Adventures in the Forgotten Realms Loaded with rares, foils, special treatments, and more 5 Rare or Mythic Rare cards per pack 15 Magic cards plus 1 foil token in every pack

I played a Swamp and passed the turn

If your starting deck follows that rule, then the creature can serve as your chosen companion." The Wiki goes on to explain how you can only have one companion in a game, it starts outside the game, and counts towards your sideboard size (i.e., in Constructed play it is one of the fifteen cards in your sideboard)

To what you would ascribe the game's longevity