Steam Siege
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This is a Pokémon TCG retail blister from the Steam Siege expansion, the Mega Evolution Two-Pack Pin Blister featuring Mega Swampert, released in early 2017. The sealed blister typically contains two Steam Siege booster packs, a collectable metal pin of Mega Swampert, and may include a promo card or collectible coin depending on the regional variant; it is sold as a small boxed/blistered retail product for casual players and collectors to obtain boosters and a themed pin.
Catalog pricing data as of 24 Apr 2026, 20:32