Pokémon Power: [Undo]
Once during your turn (before your attack), if you have Unown [U], Unown [N], Unown [D], and Unown [O] on your Bench, you may return your Active Pokémon and all cards attached to it to your hand.
[P] Hidden Power: 10
You may have up to 4 Basic Pokémon cards in your deck with Unown in their names.
Their shapes look like hieroglyphs on ancient tablets. It is said that the two are somehow related.