You may end up with more than 4 copies of a card or multiple copies of a restricted card based on wins
That's roughly a Pikachu card every 1.5 day on average
The affected cards were dismissed as rumour until 2006, when a former Wizards of the Coast employee produced undeniable photographic evidence. The card is in great condition, protected in plastic now, and showing the error clearly on the bottom right of the character image
Of those, eight are instants, seven are creatures, and five are sorceries
Flashing Rottenmouth Viper in with something like Borne Upon a Wind seems wicked, as does blinking it once its down
But assuming you have enough luck, you could realistically cause 120 more damage - and when combined with Mega Lucario ex, the total damage of a single move can be massive