With strong Treasure production cards, you can become your enemies' worst nightmare, always making them consider whether you're about to hit with another direct commander attack or the multitude of creatures spawned from your mana pool
Furthermore, due to this sets scarcity, many of these cards have not reached the publics consciousness fully though notable cards like Fellwar Stone, Ball Lightning and Tormods Crypt all debuted in The Dark, alongside Sorrows Path, arguably the worst MTG card of all time
In addition, it could potentially be reused if you had additional bounce spells
While Wizards sadly didnt provide enough cool -1/-1 counter synergies to make Hapatra a player in Standard, it is super-cool that shes a legend we can build a Commander deck around to take advantage of several -1/-1 counter themes printed in previous sets
And you can do each or all of them as you need