Since you assume your deck is sufficiently randomized, and that you run an average of 24 Pokmon, this means you have around an 8% chance of finding one of your Claydols first than any of your other Pokmon cards
Each of these colors is produced by a different type of land (the resource in this game), and each color represents a different kind of magical power
Everyone and their mother (probably great-great-grandmother, at this point) knows who Pikachu is
Luckily, the Pokemon TCG Online has tutorials that walk players through each step of the battles
But once your opponent has built up their defence, beginners often see haste as being a bit pointless
If not, I suppose it could be a decent retirement fund depending on how much I spend, but I honestly cant imagine getting rid of them