It is well-balanced and, cheating aside, the AI opponents are able to give a decent account of themselves, especially combined with the gradual process the player must go through to build his or her deck
See some of the rarest pokemon cards, and what they could cost if you want to catch them all
You will almost certainly not pull your chase card from one
Altogether, it adds up to a stern yet fair planeswalker
At eight mana each, they're massively overcosted now of course, especially because you have to pay mana each turn to keep them on the board
What if I told you that not only was that possible, but that for every card you didnt play, it got put in your yard and you got to make an Eldrazi Scion, perfect for chump blocking or using for bursts of extra mana