yugioh toon deck profile Barrel Dragon - Yu-Gi-Oh! Card Database Toon Deck profile - Fun

And yeah that mewtwo referenced by KEI is almost certainly the one Bulbapedia is talking about

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While most creatures in the deck are a discard outlet aswell it still ended up being a good amount of pieces, not too hard because the deck is a pile of good cards and a combo, but Loner + Cauldron being a kill is an upgrade for sure

So much so, in fact, that the card could well become the most expensive card ever printed

Although prices for this card have fluctuated over the years, its still occasionally available in selected card shops, making it a desirable grab for fans of Pikachu, Zekrom, or collectors of seventh-generation cards