Only damage is done to the Defending Pokmon, and not an effect
This was the masterplan of Florida genius Keith Wallis, who according to the office of attorney general James Uthmeier (thanks The Independent ) committed an extraordinary 75 thefts of Pokmon TCG boxes from various Target stores over the last year, stealing at least $10,000 worth of product

Dedenne EX The Dedenne EX Immersive Card can be obtained in two ways: Randomly by opening a Everyday Wonders pack By spending 1500 Pack Points to craft the card Terapagos EX The Terapagos EX Immersive Card can be obtained in two ways: Randomly by opening a Paradox Drive pack By spending 1500 Pack Points to craft the card Mega Lucario EX The Mega Lucario EX Immersive Card can be obtained in two ways: Randomly by opening a Pulsing Aura pack By spending 1500 Pack Points to craft the card Sobble The Sobble Immersive Card can be obtained in two ways: Randomly by opening a Pulsing Aura pack By spending 1500 Pack Points to craft the card Mew The Mew Immersive Card can be obtained in two ways: Randomly by opening a Mega Shine pack By spending 1500 Pack Points to craft the card Shiny Mew The Shiny Mew Immersive Card can be obtained in two ways: Randomly by opening a Mega Shine pack By spending 1500 Pack Points to craft the card Arven The Arven Immersive Card can be obtained in two ways: Randomly by opening a Paldean Wonders pack By spending 1500 Pack Points to craft the card Mega Gardevoir The Mega Gardevoir Immersive Card can be obtained in two ways: Randomly by opening a Fantastical Parade pack By spending 1500 Pack Points to craft the card Meowth The Meowth Immersive Card can be obtained in two ways: Randomly by opening a Fantastical Parade pack By spending 1500 Pack Points to craft the card Mega Charizard Y Mega Charizard Y is the only Immersive Card in the Crimson Blaze themed set

Well there may be a number of factors
Beyond gameplay, yugioh cards have evolved into a major collectibles market, with certain cards valued for their rarity, history, artwork, and cultural importance rather than playability