The card also comes with a printed thunderbolt and Pikachu design around the text of the card, making it even more unique
You can use this at any time for a single mana and draw a massive number of cards
It actually combos well with that darn robot, and a bunch of other things, really really easily
The first two are shown in my Base Set Pikachu variations article (see sections English Shadowless 1st edition Red Cheeks with 1st edition Black stamp imprint on the back and English Shadowless 1st edition Red Cheeks with 1st edition White stamp imprint on the back)
Shroofus Sproutsire is a bit of a weak creature, just a 1/1 for three mana, that curiously has trample, giving you room to buff Shroofus up a bit
Because many players were able to easily get the promotional items at the time, the collectibles weren't believed to be worth that much