Here are some common scenarios:
* Mega Tins: These usually contain 3-5 booster packs plus a special bonus card or playmat.
* Structure Decks: These come with a pre-built deck and often a bonus pack of cards.
* Other Tins: Some tins might offer specific card sets or be themed around particular events. Their contents will be specified on the product.
To know exactly how many cards are in a specific Yu-Gi-Oh! tin, you'll need to check the product description or the box itself.