Unown [U] 51

Card details

HP 40 · Psychic · Weakness Psychic ×2

• [Undo] · Pokémon Power — 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.
• Hidden Power 10

“Their shapes look like hieroglyphs on ancient tablets. It is said that the two are somehow related.”