Shown hanging out with a number of other Pokmon in a lake, any card that shows loads of Pokmon playing together is likely to do well in terms of value
What makes me prefer this one is the fact that results show card images along with an average price (you can actually select which online market you want to use to check prizes)
It's all too easy to think of a single Army token as separate ones and do your math wrong here, so let me lay it out: upon playing Book of MazarbulBook of Mazarbul, you get a 1/1 Orc Army
It's pretty strong, consider it
the original series had a real-life setting, GX followed a fantasy-style Dueling Academy, while the future series added a more futuristic/SF setting to the lore
A three mana creature that enables card draw is perfect for these decks, and the fact you can put her in the command zone like Edric, Spymaster of Trest could lead to a fair few Black Widow decks