Chronatog was released in the tenth Magic: The Gathering set, Visions, at a time when Magic print runs were a fraction of the size they are today - that alone gives it a certain prestige
I can see Jerren as a decent and interesting commander leading Mono Black Humans, but I think he's even more potent in the 99 of Human Aristocrat decks like Silvar, Devourer of the Free + Trynn, Champion of Freedom, and since so many of the best Clerics are Humans I think he makes a lot of sense in a Human-focused Cleric deck like Orah, Skyclave Hierophant
Cons: Lower recognition outside Europe and smaller impact on card value in global sales
Or, for Mirth, what the toothed brain case is doing
When a small village is attacked by a group of Mukotai Reckoners, Chishiro finds a glimmer of comradeship from his old life and chooses to battle alongside them, leading them to a hard-won victory