Exploring my mind

Me and some friends were playing a card game. This card game looked much like YuGiOh because you had to summon monsters, but summoning creatures in fact was the only way to win. The card had effects, because many of my cards had healing effects I won sometimes. Because of this I lent some good cards to other people. We were playing this game in a stairway of a random house with many apartments. Sometimes we were disturbed by the occupants, but they let us play there.