Some collectors will do anything to get coveted cards, and this has led to the creation of a very active Pokemon TCG marketplace
Over time, this strategy has evolved, and many similar mechanics have been introduced in Magic: The Gathering
Best cards : Uta (Leader and character), Im Invincible, New Genesis
That actually makes this one of the more common World Championship Pikachus, since the previous eight years only had three cards
The creature you use it on generally already has to be fairly impressive for it to be worthwhile, and it wont even always allow you to win combat if your creature isnt big enough
If, however, your child wants to actually play the TCG, theres a couple of excellent starting points we can highly recommend, depending on your childs age and/or experience with card games in general