"Ancient" (古（いにしえ） Inishie) is an anime-only series used by Solomon Muto. Some of the cards are also owned by Solomon's friend, Arthur Hawkins. In the English dub it was said that Solomon made a bet where whoever found all seven cards in the set would get a free chocolate milkshake from the loser, which Solomon won. When "Ancient Dragon" is in play while "Ancient City" is face-up on the field, the player can revive it from the Graveyard during the End Phase.