By the time the Tournament Arc was done, it became a dimensional war that deconstructs the Hard Light system that's been in place in the series for years, putting it on the same level as, or perhaps even more so than the Shadow Games from the first and second series animes, as well as taking a deeper look at the psychological ramifications it all has on the cast, sometimes verging on Gen Urobuchi levels of psychological breakage, especially in regards to the main protagonist
The more cards in the grave, the more powerful Seven Roads Magician can get for that final push
This is a simple 1/4 creature with lifelink that lets you scry 1 each time an artifact enters play
And there's always one or two fake cards, like, hidden amongst them, which people just have no idea they have
Therefore, I filled my sideboard with as many answers for control that also do work in other matchups
If they cant, they lose the game