Just like the never ending tales Shahrazad tells in 1001 Arabian Nights
They often synergize with effects that leverage their defensive nature, such as those that allow you to draw cards, generate value, or even turn their toughness into an offensive weapon
There are so many different directions to go with the two colors with no obvious best path
The mana effect was the one that counted, and there were a lot of good reasons to want to play a deck based around it
This means, for example, that Duh can destroy an Eighth Edition Shivan Dragon but not a Seventh Edition one (flying got reminder text for the first time in Eighth Edition)
Way 2) Buy Purchasing the cards from another collector or Pokemon store is also possible, of course