* "Elemental HERO" is a theme, not a specific card type: There are many cards that fit into the Elemental HERO archetype, but they aren't all named "Elemental HERO".
* New cards are constantly released: The Yu-Gi-Oh! Trading Card Game is constantly releasing new cards, including new Elemental HERO support.
* "Elemental HERO" can be found in different sets: The theme's cards are spread across various booster packs, structure decks, and other products.
To get a better idea of how many cards there are, you can try:
* Search online card databases: Sites like Yugioh.wikia.com, ygoprodeck.com, or the official Konami website have card databases that you can use to search for "Elemental HERO" cards.
* Use the card search function in your favorite Yu-Gi-Oh! app: Many Yu-Gi-Oh! apps have card databases and search functions to help you find specific cards.
Ultimately, the number of Elemental HERO cards is constantly evolving, so there isn't a single, definitive answer.