The other cards were given to members of the Garfield family and are kept in privacy, as Richard Garfield does not want images of this card to appear in public
I think most often youre dropping it as the Parlor, and then when you want to close the game, you unlock the Secret Arcade, which will buff your All that Glitters, Ancestral Mask et al
If you like things as they were, feel free to ignore the Set Booster
It gets significantly stronger in decks that like to take extra combats, like Karlach and Moraug, or even Aurelia
Essence Warden This Soul Warden sideprint into Planar Chaos is the one-drop 1/1 that dominates tables I alluded to earlier
There are tons of ways to supercharge her abilities: You can play Hydroid KrasisHydroid Krasis and other value creatures to keep the cards flowing freely