Scheming to Power

A world of swords and magic would be an exciting one to be reborn in, right? Right? What if the person who was reborn could use neither sword not magic though? What if they had only their brains to slowly bide their time and smell their opportunities? Ah, but what's this? I have no powers but I have a mysterious past? How is this girl who died as a result of my schemes returning and following me? I need to stop panicking and keep on my Stoic MC Poker Face. Always remember, Patience is the First Virtue!