These are the two cards you need to help you out with the dice rolling, but there are other great choices to help your strategy in general
Cards like Atraxa, Grand Unifier, Tarmogoyf, Reconstruct History, and Nethergoyf increase in effectiveness the more card types you have access to, so including a few sorceries helps unlock these cards fullest potentials
Some folks call these misprints a problem, but others disagree
In a deck that can go wide on the board, as Knights certainly can, this ability is incredibly dangerous, and can easily finish an opponent off in conjunction with other board-buff effects such as History of Benalia
It also makes two additional Faeries when it enters the battlefield