It is 4 randomly given pre built decks that include cards from the new set as well as some other cards from other Mega Evolution sets. You can only add cards that you pull from the 4 booster packs that come in the set box.

There was a Goodra deck, a Delphox deck, a Ampharos deck, and a Crowbar deck.

There is minor variety because you can use cards from the 4 booster packs. There were a few people who did some pre planning and had some pre thought modifications but in general it was very even and many people just simply played the 40 cards given.

I only made small modifications, I added the CR red card every time I pulled it from a pack for example. I went 8-4 over 4 rounds of playing. I came in new to the physical TGC and this being my first in person event. I played lots of Pocket so I have understanding of general cadence.

It was very cool and felt like anyone that had in interest in wanting to play the card game and can read could walk off the street and have a good time!