Thats an outrageous bit of value attached to one of your characters and it also protects you against the classic one-two punch of the meta defining ruby-amethyst control deck of set two, which would wipe your board with Be Prepared and then answer the first character you play with a Lady Tremaine which would force you to sacrifice it
Battle for Baldurs Gate: White Lets kick off with one of the two white bears on everyones minds
The other deck is Might and Magic, an Amethyst/Steel deck that features RotFs new keyword, Resist, and its major new deck building mechanic, bouncing your own cards back into your hand
Professor Hojo has a Training Grounds-style discount for targeted activated abilities, as well as other benefits for building around those sorts of effects
It didn't even matter what other cards were in your deck, if you could play an early Pack Rat and use its ability, the game was yours