They were printed only during a short early window of the 1999 Base Set before Wizards of the Coast added the drop shadow, after which the Unlimited run printed in huge numbers
Chart shows the price of Ditto V #SV118 at the end of each month going back as long as we have tracked the item.
The deck is really streamlined for ramping, running all stars like Ancient Stirrings and Explore, with no eggs
Though not the first set to introduce Pokemon which go against their usual Energy type (you can find more information on this in our Pokemon Energy Types guide), it certainly used them in a big way
Honestly, it was one of the last cards I threw in out of some thought that I had a few ways to make a lot of colorless mana but wanted some way to convert that mana into green or black
If it was 5 boosters from Archazias Island, that would have been amazing