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Jet Medallion, Bolass Citadel, draw spells, tutors, and black cards that lack colorless requirements in their mana costs tend to work best with Krrik, as they help you stretch your mana and card access into ridiculously explosive turns that can win you the game on the spot if your opponents dont have access to any interaction
Descent into Avernus works well with most red commanders
A players unlikely to attack the player who controls Spore Frog because they dont want to waste their combat step
This long-running legacy means that Knight is one of the most well-supported creature types in the game, making it an ideal choice for a type-focused build in the Commander format
Some people like a challenge (its me, Im some people)