This place was not what i've expected to be

Cause of my death, I don't know. Stuck within a dark void where all I have is the memories before my death, been there, don't wanna go back. Being Isekai'd to a universe where card games are now severe? Don't know how to feel about that one. I just explore and not get myself deep in the plot as long as I have my gamer. wait. Who were those groups of people? Can I go back (OC/gamer!