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The Mega Gyarados Collection is a Pokémon TCG collection box from the Steam Siege expansion released in January 2016. It typically contains a jumbo-sized promo card featuring Mega Gyarados, a foil promo card of Gyarados, several Steam Siege booster packs and additional gameplay accessories such as a coin or energy cards and a rulebook. This type of collection box is aimed at collectors seeking the featured promo cards and players looking for extra boosters and accessories to use or trade.
Catalog pricing data as of 24 Apr 2026, 17:34