It makes your dragons indestructible and slowly builds up +1/+1 counters based on their colors
As a second step, you really need to scrutinize the cards corners very closely immediately upon receipt
Its currently unknown exactly how many copies of this card exist, but its widely believed that there are only a couple of them with one copy even reportedly having a Magic: The Gathering backing being sold for around $216,000
[2] Double Tackle Does 20 damage to each Defending Pokemon
One solution would be to just discard the 72nd card from each sheet, which is the error card (I am assuming this is technically possible, it apparently worked for the blank 1st card on the Jungle uncommons sheet, but I cant say for sure if its possible to discard a card from the middle of the sheet)
Well, if you can find a way of empowering the 1/1 unblockable suitably then you vastly increase the quantity of decent one drops blue has on offer which solves the biggest issue it currently has