If you mean what cards do baseball card collectors collect,than all kinds of baseball cards. If you mean What is a baseball card collector, than one who collects baseball cards.
nothing
If you mean the card than it is the 1909-11 T206 Honus Wagner card # 499
chance of winning wild card spot
SO means strikeouts.
Nothing, the # on the back of a Baseball card is the card # in the baseball card set. Ex. My baseball card has the # 278 on the back of it. So my card is the 278th card in the set.
Baseball Card ValueI'm not sure what you mean by the "history" of baseball card values. Value is based on the selling price of recently closed auctions and sales. The recent history of these sales is gathered and averaged out to come up with an estimated value.
If it's an abbreviation for a statistic, it stands for Total Bases.
reprint
This is just a guess. Could it be shortstop?
The baseball stat WC means Wild Card as how many games back in the league race a team is.
If you mean in baseball, K is for strikeout, from the letter in the word.