Lysandre's Trump Card - Set: Phantom Forces

Players will always be free to utilize Lysandre's Trump Card in friendly competition, but it has been banned from official matches due to the havoc it caused. The effect is so potent that it blows the rest of the market out of the water. When played, Lysandre's Trump Card reshuffles all cards from both players' discard piles back into their respective decks, thus wiping the slate clean and starting again. It didn't take long for this card to gain notoriety and then be outright banned from play.