union arena demon slayer english booster box TCG: Slayer: Kimetsu No Yaiba - Starter Deck 2 includes many new cards to power up existing decks Demon Slayer Union Arena Booster

Its similar to the way evolutions work in Pokmon, though it has its quirks and resource requirements specific to this game

For example, M Gardevoir STS 79 is both Psychic and Fairy type

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Once you have enough points, just craft that card and you should be given a key for the secret pack you wanted

Its also worth noting that Eidolon of the Great Revel, which wasnt eligible to be reprinted in Modern Masters 2017 , is experiencing a price surge thanks to the Goblin Guide reprint making Modern Burn a much cheaper deck to build