Red-Black Knights is a potent explosive deck. Its counterpart in regular Standard, Mardu Knights, saw quite a lot of play a few months ago. In the smaller card pool of Standard 2021 Knights get to shine once more.
While the Standard 2021 mana base is too weak to give the consistent support aggressive decks need, two colors instead of three helps mitigate that problem. Thus, we are left with two variations: Red-Black Knights and Red-White Knights.
Both are around the same power level and have similar play styles. However, this version is slightly less aggressive, leaning more towards midrange. So it has more powerful cards, but might lack some of the early aggression of its red-white counterpart.
If you love playing with tribal decks that can turn their synergy into deadly attacks against the opponent, this deck might be the right one for you.