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That invests Glissa with a whole lot more power and usefulness than you might normally expect

An official lore guide says that they "infect" victims with splinters that start growing rapidly through their flesh, which is deliciously nasty

Doubling all of our damage permanently is a rare effect, and Quest for Pure Flame (maybe the closest comparison) takes a lot of work to set up, so I guess that Insult may indeed be a rare (or at least an abnormally strong uncommon)

There are many situations when the ability may resolve without effect

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