The Pokemon TCG is packed with valuable evolved forms of Pokemon, including some expensive Eeveelution cards
Jack can rest himself to give one of the opponents Characters -4 cost
And while the value is undeniable, its not backbreaking value, so I dont imagine it will provoke a removal spell from your opponents that something like Skullclamp or Panharmonicon will
This messy, unrefined pastiche of ideas bears a lot in common with the early years of Magic both in terms of its oddball design, and the wildly varying tone and style in the card art
It can pump creatures, give them trample and haste, gain life, draw cards, or even reanimate them, making it the ultimate toolbox commander
That makes it a one-card army engine thats difficult to deal with and floods the board with a lot of horsepower