I've been looking at the card Bazaar of Baghdad:
(Land) Tap: Draw two cards, then discard three cards.
Almost everywhere I've seen has it as over 200$, and most of the Arabian Nights set is much cheaper than that, so I assume its ability is extremely powerful. However, I can't really figure out why. It gives you a net loss of 1 card no matter what, and I suppose its ability could be compared to having the ability to mulligan later in the game but have a wider choice of cards to pick as your new hand. It would help you find a specific card in your deck if you're running a strategy based on that card (and I notice its most popular in vintage, where this is more prominent) I could see it being a decent card, I can't see where it might otherwise be valuable.
Is Bazaar of Baghdad an extremely good card? What decks would it work best in? How would I know when to use its ability in a game?