Dialga & Palkia LEGEND creates a very difficult problem if it is allowed to add more than the 6 original prize cards. How would Mismagius GL's "Grudge" attack work exactly?
http://pokegym.net/gallery/displayimage.php?imageid=45492
There would be no determinable way for an onlooking Judge to determine the number of prize cards taken, creating a game state impossible to discern. One player could easily claim that his opponent took more prizes than they truly did. Would Mismagius GL have to be errata'd to do 20+10[(total prizes taken over the course of the game)-(prizes added over the course of the game)], so that the original 6 prizes kept the integrity of the attack and game state?
In that formula, prizes on the board for the opponent at 6 or over still count as zero as they currently would, and the visual prizes remaining would mean the same damage would be done had only 6 prizes remained in play over the course of gameplay (i.e., if you see 5 in play, they would add 10 damage, whether they had taken one prize or twenty).
This is all up for speculation until confirmation, of course.
I would change the ruling so that it said 20+10 for each missing prize card.
Sorry, that was worded quite badly, but hopefully you guys understand what I meant.
THat being said, I hope they cap prizes at 6, because being allowed to go over is literally broken.