This card and its counterpart are the first Unown cards to feature more than one form of Unown in the illustration. The Unown depicted spell the name of the Poké-POWER featured on the card.
The illustration also features a gold pattern in the background, a reference to the card's inclusion in the HeartGold Collection in the Japanese set.
Origin
Return is a move in the Pokémon games that Unown cannot learn; however, the move and this attack are unrelated, as the Japanese names do not match. Hidden Power is a move in the Pokémon games that Unown can learn. This card's Pokédex entry comes from Pokémon HeartGold.