The promotional deck you sought that day was limited in it's release. Featuring a set of totally unique cards and new variants on old ones that were only coming out with that card set, It was a case of 'Buy it or miss out'. It even came with a update for Power Of Chaos that added extra cards to all three games, plus a fourth secret opponent.

You managed to get to the store first, picking up one of the first collector's tins, paying for it before anyone could snatch it out of your hand...

The new cards included the ability to duel with both the monsters and the duellists of Yu-Gi-Oh, the latter using the Ancient Egypt and Shadow Duel field cards, and even included special magic cards that were designed for use with them.
One of the first things you did was to test out the Ancient Egypt field card with a holo-arena they had set up, and played Mana on it, noting the special ability to summon a Dark Magician Girl from your deck on her first turn. It was strange to see them both standing there, and you went home.

At home, You misplayed Mana on your home version of the arena, for her to appear, then vanish. You then hear something fall upstairs. You run up, to find Mana lying on your bedroom floor, nursing a twisted ankle.
"Erm, Excuse me... but where am I?" She says in broken english...