Imposter Professor Oak (Pokemon Japanese Alpha Playtest | Pokemon Cards) prices are based on the historic sales
While far and away from the strongest EX Pokemon in terms of damage or HP, Pikachu EX is cheap, easy to build around, and can lead to some incredibly fast games if everything goes in your favour
Hallowed Haunting Hallowed Haunting is in a small subset of cards that ask you to cast and control a lot of enchantments, and seven is mainly attainable if you create tokens that are enchantments
Jaheira, Friend of the Forest turns all your tokens into Moss Diamonds and Llanowar Elves, at least in terms of mana generation
Early in design, I felt this card was powerful enough that the card's controller would have to pay to add counters
And you can bet plenty of creatures will be coming your way if you decide to rock the new Toxic mechanic