Steam Siege

Steam Siege is a really cool XY deck series, here XY cards have mega cards (Mega Gardevoir & Mega Steelix).

Format: Expanded card

You can check the prize pool in pictures 2 and 3, but most people are looking for Mega Gardevoir because it's really cool and the psychic and fairy types are good for playing expanded decks.

Value Pack Trade Public => because this is an old pack, the price can be equivalent to 1 or 2 Steam Siege packs, comparable to 1 of the newest packs like now BST packs or other new boosters. Because the longer the pack, the more expensive the pack. How to check pack at https://ptcgoprices.com/