secret pokemon cards Pokémon TCG shuffle your deck Secret card (TCG) - Bulbapedia,

The set includes fan-favorite Pokemon like Charizard, Blastoise, Venusaur, Pikachu, Mewtwo, Mew, and all the beloved Generation 1 Pokemon that started it all

And then, as a Quick Effect, you can banish it to Synchro Summon an actual Red Dragon Archfiend from your Extra Deck, double its ATK, and make it immune to

Type III is 3.33 wide and 5.5 tall, making them ideal for retro basketball and football cards called tall boys. Type IV is 4.5 wide and 7.125 tall, making them the largest of the Card Saver brand, and best for other oversized cards up to 4x6 in size

As I say, there's a lot going on for a fairly high cost, and I struggle to see this card seeing too much play given the setup required to cast it for its Shift cost, especially in Ruby & Steel decks which typically skew far more aggressive