The gap reflects the additional rarity
With Judith, the Scourge Diva pumps or just filtering tokens through Goblin Dark-Dweller or Siege-Gang Commander you might be getting enough out of it as a source of throwaway bodies to consider it in a removal-light deck like this one
In Urzas Destiny (1999), they attempted to fix Card not found
A simple card that brings a lot of value, Pheromosa can find extended usage in future metas as well, being a core part of the notorious Grass decks
That said, it is probably narrow enough that its power level wont become a problem and the fact that it needs other cards to make it truly broken should make it just a solid EDH card rather than a real issue
Collectors should not expect sealed packs, random hits, alternate art pulls or booster-style opening odds