GoT: First Rodeo of the Next Keeper (LitRPG, SI OC)

When Harry is suddenly whisked away from his life by a man calling himself the 'Keeper', he is confused. However, when he's given an opportunity to obtain power beyond his imagination, he does not even think of refusing. This is just what he'd been waiting for. For his first rodeo, he conquers the world where games are played for the throne. Very minor gamer elements.