Some people try to make their titles for Magic: The Gathering auctions slightly deceptive. For example, if you're looking at buying one original Black Lotus card, you'll find auctions that contain Black Lotus in their title. But these may not be exactly what you want. They may be repacks that have a small chance of containing a Black Lotus. Or they may be massive collections that contain a Black Lotus. Or possibly a collector's edition card.
To have a better chance at weeding out auctions you don't want, make you search more category-specific. Even if you're searching the Magic: The Gathering category, you can drill down deeper to categories like Magic Online and Individual Cards.
On the other hand, you might want to ensure you don't miss anything. In that case, choose a search category that's more general, like Magic: The Gathering. Sometimes people incorrectly categorize their items, so you may miss out on buying what you want if you go too specific.
Make sure you research who you're buying from. Take a look at their feedback history. Ask them questions if you are unsure about some details and need more information.
Here are my links to eBay
MTG
MTG Singles
MTG Boxes, Packs
MTG Foils
MTG Sets
MTGO