The rare T206 Honus Wagner card is as valuable as a gold-plated ornament. There are only 50 cards in the world. A rare card like this is worth hundreds of times its current value.
Honus Wagner, the star of the Pittsburgh Pirates, banned the manufacturer of the card, American Tobacco Company, from creating more cards with this signature. This is probably why the value of these cards sky-rocketed.
The price of a T206 Honus Wagner baseball card is very high, so you need to be careful about fakes. It's best to consult with an authenticator like PSA for a good idea of whether a card is authentic or not.