The spell was broken after an encounter with a frozen esper, and she joined a rebel group known as the Returners to fight against the imperial regime
By having a bunch of toughness on the table, we can essentially ignore a huge percentage of the opponents creatures and save our removal spells for when they matter
Collector Nostalgia Cards from the 151 set like Gengar, Dragonair, and even Poliwhirl hit players right in the nostalgia
You could also use it on yourself, potentially saving a damaged character from your own field, retrieving it, and then getting that same discard benefit
The most rare, and most valuable one is the three-color Neon Ink variant, which has a less than 1% chance of opening a Special Guest card at all, and an even smaller chance of opening this three-colored iteration.