Set Design liked how the Plans encouraged people to go down different paths in Limited and build different types of decks in Constructed
Some of the most valuable first-edition cards are: Blastoise (holographic): $4,15031,334 USD Venusaur (holographic): $2,59512,299 USD Chansey (holographic): $1,90527,412 USD Mewtwo (holographic): $1,84113,100 USD Even the original starting Pokmon, like Squirtle, Bulbasaur, and Charmander are worth around $2001,000 USD
I could also see Aggro decks that want to run Freya implementing a couple of pieces of Equipment to leverage that mana ability
In other words, mulligans are not an exact science
While we don't know the origin of this specific card, it's possible it was recently opened by a daring collector cracking product that had remained sealed for over thirty years
She then convinced a group of drow elves to follow her to the Underdarkwhere they remain her fanatical worshippers to this day