Magic: The Gathering's widely popular Commander format allows you to construct decks that revolve around a legendary creature of your choice that is reliably accessible during each game
Subtypes, like Human and Equipment, and supertypes, like snow and legendary, aren't card types
Generally, theyre on a creature cards, like Emeritus of Ideation, though theres nothing saying that that is an exclusive feature
Her second ability, Spoilers , doesn't always pop off in Magic's most popular casual format
The combination of all of these things have combined to make 40k a financial success.
As a side-note, I looked up who Gwendlyn Di Corci is and, well, suffice to say that she's the sort of person who would really appreciate handcuffs