card game protector sleeve Ultra PRO: Pokemon: Deck Sleeves: Energy: Metal Type (65ct) ChromaFusion Technology prevents peeling Board Game Sleeves - Mini

Or is this all that it is, nothing more

Off the top of my head, the only other physical card with this effect is MTG's Letter Bomb which is an Unhinged card, whereas this is meant to be a proper legal card and it's the only card in the entire game with an effect that allows it to do this

Not only does it come with a whole second card stapled to it, but its also an enchantment

5 Keldeo ex Makes Up For Minuscule Damage With Utility Card Number: 167/086 Because of the prevalence of wall cards in the current format, players often have to find unique ways to win games, as some cards cannot be damaged by specific other cards